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BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20251109T204500
DTEND;TZID=Europe/Amsterdam:20280509T000000
DTSTAMP:20260519T015235
CREATED:20251109T141249Z
LAST-MODIFIED:20251113T204734Z
UID:133068-1762721100-1841443200@www.a3veen.nl
SUMMARY:ESCAPADE mission to Mars
DESCRIPTION:Escape and Plasma Acceleration and Dynamics Explorers (ESCAPADE) is a planned spacecraft mission to Mars consisting of two spacecraft known as Blue and Gold\, the mission is led by UC Berkeley’s Space Sciences Laboratory. \nOnce expected to launch in October 2024\, it is part of NASA‘s SIMPLEx program. In August 2024 the spacecraft arrived at the launch site. However\, NASA postponed the launch due to schedule and technical issues involved with the mission’s New Glenn launch vehicle\, which was set to debut with the launch of these spacecraft. Launch on the New Glenn is now planned for no earlier than November 9\, 2025. The science goals of ESCAPADE are to: \n\nunderstand the processes controlling the structure of Mars’ hybrid magnetosphere and how it guides ion flows\nunderstand how energy and momentum are transported from the solar wind through Mars’ magnetosphere\nunderstand the processes controlling the flow of energy and matter into and out of the collisional atmosphere\n\nThere are three science experiments onboard each identical spacecraft: EMAG\, EESA\, and ELP. EMAG\, which was developed by the NASA Goddard Spaceflight Center\, is a magnetometer that will measure DC magnetic fields up to 1000 nT\, mounted at the end of the boom to reduce magnetic noise from the spacecraft. EESA is an electrostatic analyzer designed to measure the energies\, fluxes\, and masses of suprathermal ions from 2 eV to 20 keV and energies and fluxes of suprathermal electrons from 3 eV to 10 keV. It is mounted on the upper deck of the spacecraft bus\, with a 240° x 120° field of view for electrons and 247.5° x 90° field of view for ions. ELP\, developed by the Space and Atmospheric Instrumentation Lab at Embry-Riddle Aeronautical University\, is a Langmuir probe consisting of three separate sensors: the multi-needle Langmuir probe (mNLP) consists of 4 thin needles mounted in two pairs ~3/4 way up the boom and measures thermal electron density; the two planar ion probes (PIPs) are mounted on the instrument deck and measure thermal ion density\, and the floating potential probe (FPP) is also mounted on the spacecraft deck and measures changes in relative spacecraft electrostatic potential. Once the nominal science orbit is achieved\, approximately six months after arriving at Mars\, Science Campaign A involves both spacecraft flying in the same orbit at varying distances from one another\, ~170 × 8\,400 km (5.66 hours) with an inclination of 65 degrees. This will last approximately six months\, at which time Blue will lower its apoapsis to 7\,000 km and Gold will raise its apoapsis to 10\,000 km. With different orbital periods (4.9 and 6.6 hours)\, the orbits will precess (due to Mars’ nonuniform gravity field) at different rates and thus separate\, allowing simultaneous measurements of distant parts of the Mars magnetosphere. This campaign will operate for approximately five months until the end of the nominal science mission less than three years after launch. Launches on November 9 and 12\, 2025\, were scrubbed due to weather conditions and solar storms; the next launch attempt is scheduled for November 13\, 2025. The launch window opens at 19:57 UTC and runs through 21:25 UTC. \nLinks:\nESCAPADE \nVoor het eerst in jaren missie naar Mars\, vuurproef voor raket Jeff Bezos
URL:https://www.a3veen.nl/event/escapade-mission-to-mars/
CATEGORIES:Astronomie,Mars
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20251128
DTEND;VALUE=DATE:20251129
DTSTAMP:20260519T015235
CREATED:20251127T235052Z
LAST-MODIFIED:20251128T095324Z
UID:133985-1764288000-1764374399@www.a3veen.nl
SUMMARY:#RedPlanetDay 2025
DESCRIPTION:Red Planet Day commemorates the launch of the Mariner 4 spacecraft on November 28\, 1964 which was the first craft to ever reach Mars. \nSince the late 20th century\, Mars has been explored by uncrewed spacecraft and rovers\, with the first flyby by the Mariner 4 probe in 1965\, the first Mars orbiter by the Mars 2 probe in 1971\, and the first landing by Viking 1 in 1976. As of 2023\, there are at least 11 active probes orbiting Mars or at the Martian surface. Mars is an attractive target for human missions. Mars is the fourth planet and the furthest terrestrial planet from the Sun. The reddish color of its surface is due to finely grained iron(III) oxide dust in the soil\, giving it the nickname “the Red Planet”. Mars’s radius is second smallest among the planets in the Solar System at 3\,389.5 km (2\,106 mi). The Martian dichotomy is visible on the surface: on average\, the terrain on Mars’s northern hemisphere is flatter and lower than its southern hemisphere. Mars has a thin atmosphere made primarily of carbon dioxide\, and two irregularly shaped natural satellites\, Phobos and Deimos. Geologically\, Mars is fairly active\, with dust devils sweeping across the landscape and marsquakes (Martian analog to earthquakes) trembling underneath the ground. The surface of Mars hosts a large shield volcano (Olympus Mons) and one of the largest canyons in the Solar System (Valles Marineris). \nMars’s significant orbital eccentricity and axial tilt cause large seasonal changes to the polar ice caps‘ coverage and temperature swings between 163K / −110 °C to 308K / 35 °C on the surface. A Martian solar day (sol) is equal to 24.5 hours and a Martian solar year is equal to 1.88 Earth years. Like the other planets in the Solar System\, Mars was formed approximately 4.5 billion years ago. During the Noachian period from about 4.1 to 3.7 billion years ago\, Mars’s surface was marked by meteor impacts\, valley formation\, erosion\, and the possible presence of water oceans. The Hesperian period from 3.7 to 3.2–2 billion years ago was dominated by widespread volcanic activity and flooding that carved immense outflow channels. The Amazonian period\, which continues to the present\, was marked by the wind’s influence on geological processes. It is unknown whether life has ever existed on Mars. Mars is among the brightest objects in Earth’s sky\, and thus has been known from ancient times. Its high-contrast albedo features make it a common subject for viewing with a telescope. \nLinks:\nRed Planet Day: A Celebration of Mars and Its Mysteries \nRed Planet Day 2025: Why November 28 Marks A Landmark Moment In Mars Exploration \n(Exo)Planeet : Mars
URL:https://www.a3veen.nl/event/redplanetday-2025/
CATEGORIES:Astronomie,Mars
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20251210
DTEND;VALUE=DATE:20251211
DTSTAMP:20260519T015235
CREATED:20251210T223500Z
LAST-MODIFIED:20251228T225712Z
UID:134859-1765324800-1765411199@www.a3veen.nl
SUMMARY:The Eschatian Hypothesis - publication
DESCRIPTION:The research article titled “The Eschatian Hypothesis” explains that the first detection of an astrophysical object is usually not representative of the overall type. \nInstead\, we first tend to detect things with large observational signatures\, due to our detection methods and their biases. The history of astronomy is full of examples. The history of exoplanet detection illustrates the phenomenon. The very first exoplanets were found in the early 1990s orbiting pulsars. But now we know that those were not representative. In the NASA Exoplanet Archive of more than 6\,000 exoplanets\, fewer than 10 were found around pulsars. They were detected because pulsars are like exquisitely timed cosmic lighthouses\, and orbiting exoplanets altered that exquisite timing noticeably. It had nothing to do with how plentiful these types of planets are. For decades\, science fiction writers have tried their best to prepare us for eventual contact with aliens. Their efforts are dominated by several recurrent tropes. There’s the invasion by a warlike species\, there’s the highly evolved species trying to communicate with our primitive species\, there’s the benevolent aliens come to save us from ourselves\, and there’s the mischievous anal-probers and medical experimenters. But those examples are highly unlikely to represent first contact\, according to new thinking and research. Not just because they may be totally unrealistic\, but because of what might motivate another species to contact us\, and how that alters the observational signal they use to announce their presence. \n\nLinks:\nFirst Contact With an Alien Civilization Could Be ‘Loud’. Here’s Why
URL:https://www.a3veen.nl/event/the-eschatian-hypothesis-publication/
CATEGORIES:Astronomie,Exoplaneet
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20251214
DTEND;VALUE=DATE:20251215
DTSTAMP:20260519T015235
CREATED:20250828T221949Z
LAST-MODIFIED:20250829T182503Z
UID:129882-1765670400-1765756799@www.a3veen.nl
SUMMARY:Meteorenzwerm Geminiden in december 2025
DESCRIPTION:De meteorenzwerm Geminiden bereikt op zondag 14 december 2025\, rond 05:45\, zijn maximum\, de meteoren van de Geminiden zijn gemiddeld snel\, gelig van kleur\, vaak helder en hebben korte sporen. \nWanneer de radiant in het zenit zou staan\, zouden er van deze zwerm naar verwachting gemiddeld zo’n 120 meteoren per uur vallen. De radiant van de zwerm staat rond 02:30 in het hoogste punt aan de hemel\, op 70° boven de horizon. Bij ons zijn ieder uur vermoedelijk ongeveer 85 meteoren zichtbaar van deze zwerm. In totaal zijn er\, door meteoren van andere zwermen en sporadische meteoren\, bij donkere en heldere hemel circa 85–100 meteoren per uur zichtbaar. Op een goed donkere plek zijn bijna drie keer zoveel meteoren zichtbaar als in een grote stad. De Maan komt om 02:55 op\, is voor ongeveer 30% verlicht en kan eventueel storen. Rond 8:00 uur gaat het schemeren en om 08:41 komt de Zon op. De meteoren van de meeste zwermen verschijnen niet allemaal op de dag van het maximum\, maar de Geminiden zijn bijzonder scherp gepiekt\, en de zwerm duurt niet veel langer dan 21 uur. Een dag voor of na het maximum is nog slechts 21% van het piekaantal meteoren per uur te zien. De typische snelheden van de meteoren in deze zwerm zijn met circa 35 km/s (ongeveer 124.560 km/uur) vrij gemiddeld. \nLinks:\nMeteorenzwerm Geminiden in december 2025
URL:https://www.a3veen.nl/event/meteorenzwerm-geminiden-in-december-2025/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20251223
DTEND;VALUE=DATE:20251224
DTSTAMP:20260519T015235
CREATED:20251221T234948Z
LAST-MODIFIED:20251222T195005Z
UID:134757-1766448000-1766534399@www.a3veen.nl
SUMMARY:Meteorenzwerm Ursiden in december 2025
DESCRIPTION:De meteorenzwerm Ursiden bereikt op dinsdag 23 december 2025\, rond 00:00\, zijn maximum. De meteoren van de Ursiden zijn niet erg opvallend\, wanneer de radiant in het zenit zou staan\, zouden er van deze zwerm naar verwachting gemiddeld zo’n 12 meteoren per uur vallen. \nDe radiant van de zwerm staat rond 09:00 in het hoogste punt aan de hemel\, op 67° boven de horizon. Het beste moment om Ursiden waar te nemen is op 23 december rond 04:30. De radiant staat op dat moment zo’n 55° boven de horizon\, in het noordnoordoosten. Door de matige omstandigheden zijn er in onze streken dan vermoedelijk maar circa 2–6 meteoren per uur van deze zwerm te zien. In totaal zijn er\, door meteoren van andere zwermen en sporadische meteoren\, bij donkere en heldere hemel circa 11–19 meteoren per uur zichtbaar. Op een donkere locatie zijn ongeveer vijf keer zoveel meteoren te zien als in dichtbevolkt gebied. De Maan stoort niet. Rond 08:00 gaat het schemeren en om 08:47 komt de Zon op. Over het algemeen zijn de de meteoren van een zwerm niet alleen op de dag van het maximum zichtbaar\, maar de Ursiden zijn bijzonder scherp gepiekt\, en de zwerm duurt niet veel langer dan 16 uur. Een dag voor of na het maximum is nog slechts 14% van het piekaantal meteoren per uur te zien. De snelheden van de meteoren van de Ursiden zijn gemiddeld: zo’n 35 km/s\, dat is circa 126.000 km/uur. \nLinks:\nMeteorenzwerm Ursiden in december
URL:https://www.a3veen.nl/event/meteorenzwerm-ursiden-in-december-2025/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260101
DTEND;VALUE=DATE:20260102
DTSTAMP:20260519T015235
CREATED:20260101T192311Z
LAST-MODIFIED:20260111T135907Z
UID:135233-1767225600-1767311999@www.a3veen.nl
SUMMARY:Betelgeuse: Detection of the Expanding Wake of the Companion Star - publication
DESCRIPTION:Almost eight years of observations using the Hubble Space Telescope\, the Fred Lawrence Whipple Observatory in Arizona\, and Roque de Los Muchachos Observatory in the Canary Islands\, Spain\, provided sufficient evidence of a second star’s ‘wake’ in the guise of a high-density trail of gas in Betelgeuse’s bloated atmosphere. \nA small companion star has been confirmed\, revealed by the wake it leaves as it plows through the red giant’s atmosphere. Ignoring interference from the occasional dusty sneeze\, Betelgeuse’s light seems to vary according to two distinct cycles. One lasts about 400 days and has been linked to internal pulsations. The second\, however\, lasts around 2\,100 days\, and has been much harder to account for. The leading hypothesis suggests a small\, dim companion star on a tight orbit around the red giant\, with observations culminating in a likely detection last July. Now\, Betelgeuse’s buddy has finally been confirmed\, several months after its proposed name\, Siwarha\, was accepted. The study ‘Betelgeuse: Detection of the Expanding Wake of the Companion Star‘ has been accepted for publication in The Astrophysical Journal. \nLinks:\nBetelgeuse Is Definitely Not Alone\, 8-Year Study Confirms \nNASA Hubble Helps Detect ‘Wake’ of Betelgeuse’s Elusive Companion Star
URL:https://www.a3veen.nl/event/betelgeuse-detection-of-the-expanding-wake-of-the-companion-star-publication/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260103
DTEND;VALUE=DATE:20260104
DTSTAMP:20260519T015235
CREATED:20260103T163006Z
LAST-MODIFIED:20260103T163006Z
UID:134965-1767398400-1767484799@www.a3veen.nl
SUMMARY:Meteorenzwerm Boötiden in januari 2026
DESCRIPTION:De meteorenzwerm Boötiden bereikt op zaterdag 3 januari 2026\, rond 23:45\, zijn maximum\, de meteoren van de Boötiden hebben lange sporen en zijn zwak en blauwachtig. \nWanneer de radiant in het zenit zou staan\, zouden er van deze zwerm naar verwachting gemiddeld zo’n 130 meteoren per uur vallen. De radiant van de zwerm staat rond 09:00 in het hoogste punt aan de hemel\, op 86° boven de horizon. Het beste moment om Boötiden waar te nemen is op 4 januari rond 04:15. Dat is ongveer 4.5 uur na het moment van het maximum\, wat niet ideaal is voor een zwerm met een korte piek als deze. Hierdoor zijn zeker 55% minder meteoren te zien dan in het meest gunstige geval. De radiant staat op dat moment zo’n 45° boven de oostnoordoostelijke horizon. Doordat de omstandigheden niet ideaal zijn\, zijn er bij ons dan ieder uur naar schatting slechts ongeveer 7–14 meteoren van deze zwerm zichtbaar. Samen met meteoren van andere zwermen\, en sporadische meteoren\, zijn er bij donkere\, heldere hemel in totaal circa 8–15 meteoren per uur zichtbaar. De Maan is voor ongeveer 100% verlicht en is een flinke stoorzender; dit jaar zijn hierdoor alleen de helderste meteoren zichtbaar. Rond 08:00 gaat het schemeren en om 08:47 komt de Zon op. De Boötidenzwerm is dermate scherp gepiekt dat het zaak is zo dicht mogelijk bij het maximum waar te nemen. De meteoren van de meeste zwermen verschijnen niet allemaal op de dag van het maximum\, maar de Boötiden zijn bijzonder scherp gepiekt\, en de zwerm duurt niet veel langer dan 8 uur. Een dag voor of na het maximum is nog slechts 2% van het piekaantal meteoren per uur te zien. De snelheden van de meteoren van de Boötiden zijn gemiddeld: zo’n 41 km/s\, dat is circa 149.040 km/uur. \nLinks:\nMeteorenzwerm Boötiden in januari 2026
URL:https://www.a3veen.nl/event/meteorenzwerm-bootiden-in-januari-2026/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260104
DTEND;VALUE=DATE:20260109
DTSTAMP:20260519T015235
CREATED:20260104T215432Z
LAST-MODIFIED:20260109T220243Z
UID:135206-1767484800-1767916799@www.a3veen.nl
SUMMARY:#AAS247 247th AAS meeting
DESCRIPTION:The American Astronomical Society (AAS) is an American society of professional astronomers and other interested individuals\, headquartered in Washington\, DC. \nThe primary objective of the AAS is to promote the advancement of astronomy and closely related branches of science\, while the secondary purpose includes enhancing astronomy education and providing a political voice for its members through lobbying and grassroots activities. Its current mission is to enhance and share humanity’s scientific understanding of the universe as a diverse and inclusive astronomical community. One goal of the Society to help achieve its mission is to facilitate and strengthen the interactions among members through professional meetings and other means\, including supporting AAS Divisions and others in the field. AAS Meeting Services provides comprehensive meeting planning and support to our Divisions\, ourselves\, and others in the astronomical sciences. \nLinks:\n247th AAS meeting
URL:https://www.a3veen.nl/event/aas247-247th-aas-meeting/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20260115T200000
DTEND;TZID=Europe/Amsterdam:20260115T210000
DTSTAMP:20260519T015235
CREATED:20260115T090815Z
LAST-MODIFIED:20260117T195633Z
UID:135442-1768507200-1768510800@www.a3veen.nl
SUMMARY:Babelsberger Sternennächte – Wechselwirkungen zwischen Sternen und Planeten | Dr. Nikoleta Ilić Petković (TV webcast)
DESCRIPTION:Die Leibniz-Instituts für Astrophysik Potsdam (AIP) Babelsberger Sternennächte finden online statt\, in der Regel gibt es immer am 3. Donnerstag im Monat einen neuen Vortrag einer Wissenschaftlerin oder eines Wissenschaftlers des AIP\, der ab 20 Uhr auf dem YouTube-Kanal von Urknall\, Weltall und das Leben ausgestrahlt wird. \nIn ihrem Vortrag erklärt Dr. Nikoleta Ilić Petković\, Postdoktorandin in der Forschungsgruppe Sternphysik und Exoplaneten\, wie Sterne und ihre Planeten sich gegenseitig beeinflussen können. Dabei spielen vor allem zwei Effekte eine Rolle: die elektromagnetische Wechselwirkung und die Gezeitenwechselwirkung. Beide Effekte kennen wir von der Erde: Wenn elektrisch geladene Teilchen aus dem Sonnenwind durch das Erdmagnetfeld auf die Atmosphäre gelenkt werden\, können leuchtende Polarlichter entstehen. Dieses Phänomen wurde auch bei anderen Planeten des Sonnensystems wie dem Jupiter beobachtet und kann ebenfalls bei Exoplaneten vorkommen. Die Gezeitenkräfte von Mond und Sonne sind auf der Erde für Ebbe und Flut verantwortlich. Der umgekehrte Einfluss von Planeten auf ihren Stern ist im Sonnensystem jedoch nur sehr schwer nachweisbar. Hier kommen Exoplaneten ins Spiel: Viele dieser fernen Planeten befinden sich so nah an ihrem Mutterstern\, dass messbare Gezeiten- und elektromagnetische Wechselwirkungen auftreten können. Der Vortrag erläutert diese Wechselwirkungen und ihre möglichen Folgen für die Sterne. \n\nLinks:\nBabelsberger Sternennächte \nBabelsberger Sternennächte – playlist
URL:https://www.a3veen.nl/event/babelsberger-sternennachte-wechselwirkungen-zwischen-sternen-und-planeten-dr-nikoleta-ilic-petkovic-tv-webcast/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260116
DTEND;VALUE=DATE:20260228
DTSTAMP:20260519T015235
CREATED:20260116T190519Z
LAST-MODIFIED:20260123T193239Z
UID:135790-1768521600-1772236799@www.a3veen.nl
SUMMARY:Stertelling 2026
DESCRIPTION:✨Doe jij mee? Ga sterren tellen voor de wetenschap. \nDoor samen te tellen hoeveel sterren we kunnen zien\, meten we waar in Nederland het nog écht donker is.🌌 De opdracht is simpel: ga naar buiten\, laat je ogen even een kwartiertje aan het donker wennen en tel vervolgens de sterren binnen het sterrenbeeld Orion. Je kunt ervoor kiezen om één avond mee te meten of iedere avond gedurende de meetactie\, elke meting is de moeite waard! 🕗Tellen kan in 2026 van 16 t/m 28 januari en 15 t/m 27 februari\, iedere avond vanaf 20:00. De meetactie vindt plaats in twee periodes waarin de maan zich onder de horizon bevindt. Op die manier zie je namelijk de meeste sterren. Bij volle maan\, slecht weer of een bewolkte hemel is het erg moeilijk om sterren te tellen\, het is dus hopen op goed weer. In de handleiding leer je welke sterren je moet tellen en hoe je de meting uitvoert. Je kunt er voor kiezen om één avond mee te meten of iedere avond gedurende de meetactie\, elke meting is de moeite waard. Via het telformulier kun jij je metingen kan doorgeven\, en er is de Sterrentelkaart\, waar je je eigen en andermans metingen kunt zien. De Sterrentelkaart is mogelijk gemaakt door Geodienst\, Centrum voor Informatie Technologie\, Rijksuniversiteit Groningen. \nLinks:\nStertelling \nHelp jij mee sterren tellen? Nacht wordt steeds lichter en dat is een slecht teken
URL:https://www.a3veen.nl/event/stertelling-2026/
CATEGORIES:Astronomie,Burgerwetenschap,kennis
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20260203T212000
DTEND;TZID=Europe/Amsterdam:20260203T215100
DTSTAMP:20260519T015235
CREATED:20260203T133732Z
LAST-MODIFIED:20260204T135635Z
UID:136141-1770153600-1770155460@www.a3veen.nl
SUMMARY:Focus : Mens op de maan (TV NPO 2)
DESCRIPTION:Focus is een Nederlands wetenschappelijk televisieprogramma van de NTR. Het programma volgde in 2023 het NTR-programma Atlas op als wetenschapsprogramma van de Nederlandse Publieke Omroep. \nIn het programma gaan presentatoren Petra Grijzen en Lara Billie Rense op zoek naar oplossingen voor actuele problemen in de wereld. Focus is de crossmediale titel van het platform NTR Wetenschap. Naast het tv-programma is er de Focus-podcast die wordt gepresenteerd door Lara Billie Rense. Het platform heeft een YouTube-kanaal en is actief op Facebook\, X\, LinkedIn\, Instagram en TikTok. \nPetra Grijzen duikt in de wereld van de ruimtevaart. Voor het eerst sinds het Apollo-programma\, eind jaren 60 keert de mens terug naar de maan. Met het Artemis-programma plant NASA een menselijke maanlanding begin 2027. Waarom duurde het ruim vijf decennia voordat er weer een maanlanding wordt ondernomen en waarom willen we eigenlijk naar de maan? Maar de hoofdvraag is vooral wat er (fysiek) nodig is voor een mens om als astronaut op de maan te kunnen landen en weer veilig naar aarde terug te keren. \nLinks:\nFocus : Mens op de maan (na afloop bekijken) \nHoe het kwam dat ze 50 jaar geleden zo naar de maan gingen? Het waren heel andere types\, toen: cowboys\, geen huisvaders
URL:https://www.a3veen.nl/event/focus-mens-op-de-maan-tv-npo-2/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260206
DTEND;VALUE=DATE:20260207
DTSTAMP:20260519T015235
CREATED:20260206T122459Z
LAST-MODIFIED:20260326T124215Z
UID:138549-1770336000-1770422399@www.a3veen.nl
SUMMARY:Sequential fragmentation of C/2025 K1 (ATLAS) after its near-sun passage - publication
DESCRIPTION:Study ‘Sequential fragmentation of C/2025 K1 (ATLAS) after its near-sun passage‘: The Hubble Space Telescope caught a rare moment on camera\, getting a chance to watch a comet break up as it hurtled through space. \nBy sheer coincidence\, Hubble was able to witness comet C/2025 K1 (ATLAS) fragmenting into at least four pieces after it had passed the sun last November. Now\, a sequence of extraordinary images depicting this event is shedding light on what happens to comets as they split apart. Comet K1 reached perihelion at 0.33 au on 2025 October 8. Daily monitoring by the LCO Outbursting Objects Key Project revealed a major activity increase between November 2 and 4\, accompanied by rapid changes in coma morphology. Serendipitous HST/STIS acquisition images obtained on November 8-10 captured the comet only days after this event and resolved five fragments\, providing an early high-resolution view of a nucleus in the process of disruption. Fragment motions and morphologies indicate a hierarchical fragmentation sequence\, including a slow secondary split of fragment II. Back extrapolation shows that both the primary and secondary breakups preceded their associated photometric outbursts by roughly one to three days. This consistent lag\, together with the appearance of thin\, short-lived arclets around fragment I in the first HST epoch\, suggests that freshly exposed interior material warms rapidly but requires time before dust can be released efficiently. Given the comet’s close perihelion passage\, rotational instability driven by enhanced outgassing torques is a plausible contributor to nucleus disintegration and dust release\, and may represent the primary source of the observed brightening. These combined ground- and space-based observations provide rare\, time-resolved constraints on the thermal and structural evolution of a fragmented comet near perihelion and highlight the scientific value of capturing a nucleus within days of disruption\, when thermal adjustment\, dust mantle re-formation\, and outgassing-driven torques jointly govern the onset of activity. \nLinks:\nHubble Caught an Accidental Glimpse of a Comet Breakup\, Snapping Pictures of Bright Blue Fragments \nIcarus (https://doi.org/10.1016/j.icarus.2026.116996): Sequential fragmentation of C/2025 K1 (ATLAS) after its near-sun passage
URL:https://www.a3veen.nl/event/sequential-fragmentation-of-c-2025-k1-atlas-after-its-near-sun-passage-publication/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260212
DTEND;VALUE=DATE:20260217
DTSTAMP:20260519T015235
CREATED:20260212T090447Z
LAST-MODIFIED:20260213T090619Z
UID:136417-1770854400-1771286399@www.a3veen.nl
SUMMARY:I Heart Pluto Festival 2026
DESCRIPTION:The 2026 I Heart Pluto Festival is a four-day celebration honoring the discovery of Pluto on February 18\, 1930 and the enduring spirit of exploration that continues to define Flagstaff’s scientific community\, it is organized by Lowell Observatory. \nLinks:\nI Heart Pluto Festival
URL:https://www.a3veen.nl/event/i-heart-pluto-festival-2026/
LOCATION:Flagstaff\, Flagstaff\, United States
CATEGORIES:Astronomie,Pluto
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20260212T164500
DTEND;TZID=Europe/Amsterdam:20260212T171300
DTSTAMP:20260519T015235
CREATED:20260211T231348Z
LAST-MODIFIED:20260212T194109Z
UID:136403-1770914700-1770916380@www.a3veen.nl
SUMMARY:First Ariane 6 launch with four boosters (Ariane 64)
DESCRIPTION:The first Ariane 6 launch with four boosters (Ariane 64) was set for 12 February between 16:45–17:13 GMT (17:45–18:13 CET\, 13:45–14:13 local time)\, Europe’s most powerful rocket lifted off – now with even more power. \nThis will be the sixth flight for Ariane 6\, and the first with four boosters to propel the rocket off the launch pad at Europe’s Spaceport in French Guiana. \nLinks:\nEuropean Ariane 6 rocket lifts off with more power for the first time
URL:https://www.a3veen.nl/event/first-ariane-6-launch-with-four-boosters-ariane-64/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20260217T120000
DTEND;TZID=Europe/Amsterdam:20260217T123000
DTSTAMP:20260519T015235
CREATED:20260212T050832Z
LAST-MODIFIED:20260212T151455Z
UID:136391-1771329600-1771331400@www.a3veen.nl
SUMMARY:Zonsverduistering op 17 februari 2026
DESCRIPTION:Wereldkaart van de centrale en gedeeltelijke zonsverduistering op 17 februari 2026\nOp dinsdag 17 februari 2026 vindt een ringvormige zonsverduistering plaats\, maar in Europa is deze eclips helaas onzichtbaar. \nLinks:\nZonsverduistering op 17 februari 2026 \nCatch a ‘Ring of Fire’ Eclipse and Rare Planetary Parade This February 2026
URL:https://www.a3veen.nl/event/zonsverduistering-op-17-februari-2026/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260218
DTEND;VALUE=DATE:20260219
DTSTAMP:20260519T015235
CREATED:20260218T090001Z
LAST-MODIFIED:20260218T090001Z
UID:136635-1771372800-1771459199@www.a3veen.nl
SUMMARY:Pluto : ontdekking (1930) 2026
DESCRIPTION:Pluto is een dwergplaneet in de Kuipergordel\, de voorlaatste zone van het zonnestelsel\, en werd op 18 februari 1930 ontdekt door de Amerikaanse astronoom Clyde Tombaugh tijdens het vergelijken van fotografische platen met behulp van een blink comparator op het Lowell Observatory in Arizona gedurende een zoektocht naar een onbekende Planeet X in een baan buiten Neptunus\, die was voorspeld door Percival Lowell. \nDe dwergplaneet is vernoemd naar de Romeinse god van de onderwereld\, Pluto en werd tot 2006 geclassificeerd als de negende planeet. Hij heeft in de catalogus van planetoïden nummer 134340. De sterk excentrische baan van Pluto ligt grotendeels buiten die van de planeet Neptunus. Hij draait in 248 jaar om de zon en is gemiddeld bijna 40 maal zo ver ervan verwijderd als de Aarde. Pluto heeft vijf manen\, waarvan de grootste – Charon – zoveel massa heeft dat Pluto en Charon rond een gemeenschappelijk zwaartepunt draaien dat buiten het oppervlak van Pluto zelf ligt\, waardoor beide hemellichamen door sommigen als een dubbel-dwergplaneet worden gezien. \nLinks:\nAlles wat je wil weten over dwergplaneet Pluto \nPluto Fact Sheet \nI Heart Pluto Festival 2026 \nIs Pluto a planet or not? Who cares! Our love for the King of the Kuiper Belt is stronger than ever 95 years later
URL:https://www.a3veen.nl/event/pluto-ontdekking-1930-2026/
CATEGORIES:Astronomie,Pluto
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260219
DTEND;VALUE=DATE:20260220
DTSTAMP:20260519T015235
CREATED:20260219T143338Z
LAST-MODIFIED:20260517T141651Z
UID:140620-1771459200-1771545599@www.a3veen.nl
SUMMARY:Measurement of a lithium plume from the uncontrolled re-entry of a Falcon 9 rocket - publication
DESCRIPTION:A 10-fold enhancement of lithium atoms was detected at 96 km altitude by a resonance lidar at Kühlungsborn\, Germany\, approximately 20 hours after the uncontrolled re-entry of a Falcon 9 upper stage. \nThe upper-atmospheric extension of the ICOsahedral Nonhydrostatic (ICON – a unified modeling system for global numerical weather prediction and climate studies) general circulation model\, nudged to ECMWF\, was used to calculate winds. Backwards trajectories\, including wind variability as measured by radar\, traced air masses to the Falcon 9 re-entry path at 100 km altitude\, west of Ireland. The study ‘Measurement of a lithium plume from the uncontrolled re-entry of a Falcon 9 rocket‘ presents the first measurement of upper-atmospheric pollution resulting from space debris re-entry and the first observational evidence that the ablation of space debris can be detected by ground-based lidar. The analysis of geomagnetic conditions\, atmospheric dynamics\, and ionospheric measurements supports the claim that the enhancement was not of natural origin. Our findings demonstrate that identifying pollutants and tracing them to their sources is achievable\, with significant implications for monitoring and mitigating space emissions in the atmosphere. \nLinks:\nMetals from spacecraft reentry in stratospheric aerosol particles – publication
URL:https://www.a3veen.nl/event/measurement-of-a-lithium-plume-from-the-uncontrolled-re-entry-of-a-falcon-9-rocket-publication/
CATEGORIES:Astronomie,Bibliotheek,Fysica,kennis,Klimaat
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20260219T200000
DTEND;TZID=Europe/Amsterdam:20260219T210000
DTSTAMP:20260519T015235
CREATED:20260219T001331Z
LAST-MODIFIED:20260219T191403Z
UID:136707-1771531200-1771534800@www.a3veen.nl
SUMMARY:Babelsberger Sternennächte – Das zirkumgalaktische Medium: Auf der Suche nach versteckter Materie | Dr. Ramona Augustin (TV webcast)
DESCRIPTION:Die Leibniz-Instituts für Astrophysik Potsdam (AIP) Babelsberger Sternennächte finden online statt\, in der Regel gibt es immer am 3. Donnerstag im Monat einen neuen Vortrag einer Wissenschaftlerin oder eines Wissenschaftlers des AIP\, der ab 20 Uhr auf dem YouTube-Kanal von Urknall\, Weltall und das Leben ausgestrahlt wird. \nDr. Ramona Augustin\, Astrophysikerin in der Abteilung Galaxien und Quasare\, spricht zum Thema: „Auf der Suche nach versteckter Materie: Das Zirkumgalaktische Medium“. Dabei handelt es sich um das Gas\, das sich in den Halos um Galaxien befindet. Es spielt eine wichtige Rolle bei der Galaxienentwicklung\, bleibt jedoch für das bloße Auge unsichtbar. Mit Hilfe modernster spektroskopischer Methoden\, kann es dennoch gelingen\, dieses Gas aufzuspüren\, zu analysieren und damit ein Stück mehr über die Entstehung von Galaxien und ihre Weiterentwicklung zu verstehen. \nLinks:\nBabelsberger Sternennächte \nBabelsberger Sternennächte – playlist
URL:https://www.a3veen.nl/event/babelsberger-sternennachte-das-zirkumgalaktische-medium-auf-der-suche-nach-versteckter-materie-dr-ramona-augustin-tv-webcast/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260227
DTEND;VALUE=DATE:20260302
DTSTAMP:20260519T015235
CREATED:20260227T150448Z
LAST-MODIFIED:20260307T150505Z
UID:137631-1772150400-1772409599@www.a3veen.nl
SUMMARY:50e Landelijke Sterrenkijkdagen 2026
DESCRIPTION:De Nederlandse sterrenwachten\, planeteria en amateursterrenkundigen organiseren elk jaar de Landelijke Sterrenkijkdagen\, belangstellenden krijgen de kans om met eigen ogen door telescopen naar hemellichamen te kijken. \nBij slecht weer is er een alternatief programma met lezingen\, exposities\, dia’s en informatie over sterrenkunde als hobby. De meeste sterrenwachten\, een aantal Koninklijke Nederlandse Vereniging voor Weer- en Sterrenkunde (KNVWS) afdelingen en andere enthousiaste amateurs stellen in dat weekend hun deuren open om het geïnteresseerde publiek te laten kennismaken met sterrenkunde. Stichting ‘De Koepel’ te Utrecht was de coördinator van de landelijke Sterrenkijkdagen\, vanaf 2014 is de KNVWS de coördinator. \nLinks:\nLandelijke Sterrenkijkdagen
URL:https://www.a3veen.nl/event/50e-landelijke-sterrenkijkdagen-2026/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20260303T120500
DTEND;TZID=Europe/Amsterdam:20260303T130400
DTSTAMP:20260519T015235
CREATED:20260116T061259Z
LAST-MODIFIED:20260227T174833Z
UID:135473-1772539500-1772543040@www.a3veen.nl
SUMMARY:Totale maansverduistering op 3 maart 2026
DESCRIPTION:Op dinsdag 3 maart 2026 vindt een totale maansverduistering plaats\, hierbij beweegt de Maan zich door de schaduw van de Aarde\, zodat er geen direct zonlicht meer op het maanoppervlak valt en de hele Maan veel donkerder is dan normaal. \nDe eclips is in Europa helaas onzichtbaar. De verduistering heeft een grootte van 1.15 in de kernschaduw. Een totale maansverduistering kan erg indrukwekkend zijn. Tijdens de totaliteit\, die duurt van 12:05 tot 13:04\, bevindt de Maan zich volledig in de kernschaduw van de Aarde en valt er geen direct zonlicht meer op de Maan. Echter\, een beetje zonlicht valt door de aardatmosfeer en wordt gebroken\, waardoor dit het maanoppervlak alsnog kan bereiken. Dit is met name rood licht\, waardoor er een rode gloed over de Maan komt\, deze fase wordt in de volksmond ook wel Bloedmaan genoemd\, en duurt bij deze eclips circa 59 minuten. Een maansverduistering doet zich voor wanneer de Zon\, de Aarde en de Maan op één lijn staan (met de aarde in het midden)\, oftewel als zon en maan in oppositie staan. Normaal weerkaatst de Maan het licht van de zon naar de aarde\, maar tijdens een maansverduistering staat de aarde in de weg en ontvangt de maan geen zonlicht: de maan bevindt zich in de schaduw van de aarde en wordt dus donker\, ofwel verduisterd. Maansverduisteringen treden in een patroon op. Deze zogenaamde Saros-cyclus herhaalt zich elke 18 jaar. \nLinks:\nTotale maansverduistering op 3 maart 2026 \nHow to observe the March 3 total lunar eclipse
URL:https://www.a3veen.nl/event/totale-maansverduistering-op-3-maart-2026/
CATEGORIES:Astronomie,Maan,Zon
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260315
DTEND;VALUE=DATE:20260316
DTSTAMP:20260519T015235
CREATED:20260315T010135Z
LAST-MODIFIED:20260315T210847Z
UID:138034-1773532800-1773619199@www.a3veen.nl
SUMMARY:World Contact Day 2026
DESCRIPTION:World Contact Day was first declared in March 1953 by an organization called the International Flying Saucer Bureau (IFSB)\, as a day on which all IFSB members would attempt to send a telepathic message into space. \nThe IFSB voted to hold such a day in 1953\, theorising that if both telepathy and alien life were real\, a large number of people focussing on an identical piece of text may be able to transmit the message through space. IFSB members focused on the following message during 1953: \nCalling occupants of interplanetary craft! Calling occupants of interplanetary craft that have been observing our planet EARTH. We of IFSB wish to make contact with you. We are your friends\, and would like you to make an appearance here on EARTH. Your presence before us will be welcomed with the utmost friendship. We will do all in our power to promote mutual understanding between your people and the people of EARTH. Please come in peace and help us in our EARTHLY problems. Give us some sign that you have received our message. Be responsible for creating a miracle here on our planet to wake up the ignorant ones to reality. Let us hear from you. We are your friends. \nThe 1953 celebration is referenced in the song “Calling Occupants of Interplanetary Craft“\, created in 1976 by Klaatu and later covered by The Carpenters. \nLinks:\nKlaatu Track Facts \nWorld Contact Day brings together E.T. enthusiasts from all over the world
URL:https://www.a3veen.nl/event/world-contact-day-2026/
CATEGORIES:Cultuur,Muziek,UAP/UFO
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20260319T200000
DTEND;TZID=Europe/Amsterdam:20260319T210000
DTSTAMP:20260519T015235
CREATED:20260319T092418Z
LAST-MODIFIED:20260327T092941Z
UID:138614-1773950400-1773954000@www.a3veen.nl
SUMMARY:Babelsberger Sternennächte – Weltraumwetter – Was tut sich da draußen? | Dr. Christian Vocks (TV webcast)
DESCRIPTION:Die Leibniz-Instituts für Astrophysik Potsdam (AIP) Babelsberger Sternennächte finden online statt\, in der Regel gibt es immer am 3. Donnerstag im Monat einen neuen Vortrag einer Wissenschaftlerin oder eines Wissenschaftlers des AIP\, der ab 20 Uhr auf dem YouTube-Kanal von Urknall\, Weltall und das Leben ausgestrahlt wird. \nDie Aktivität der Sonne zeigt sich in ihrem 11-jährigen Sonnenfleckenzyklus. Die starken Magnetfelder in Sonnenflecken speichern Energie\, die in solaren Flares und koronalen Massenauswürfen schlagartig freigesetzt werden kann. Die Sonnenaktivität hat erhebliche Auswirkungen auf die Erde und den erdnahen Weltraum\, wobei uns das Magnetfeld der Erde vor den direkten Auswirkungen schützt. Dieser Einfluss wird “Weltraumwetter” genannt. In seinem Vortrag stellt Christian Vocks die Ursache und Mechanismen der Sonnenaktivität vor\, und diskutiert die Auswirkung des Weltraumwetters auf die Erde und unsere technischen Systeme. \nLinks:\nBabelsberger Sternennächte \nBabelsberger Sternennächte – playlist
URL:https://www.a3veen.nl/event/babelsberger-sternennachte-weltraumwetter-was-tut-sich-da-drausen-dr-christian-vocks-tv-webcast/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260401
DTEND;VALUE=DATE:20260501
DTSTAMP:20260519T015235
CREATED:20260401T093405Z
LAST-MODIFIED:20260401T093717Z
UID:138820-1775001600-1777593599@www.a3veen.nl
SUMMARY:#GAM2026 Global Astronomy Month 2026
DESCRIPTION:Inspired by the 100 hours of astronomy\, this annual offshoot began upon the inception of Astronomers Without Borders and remains one of its flagship programs. \nA mix of various programs ranging from Astro Arts to Observational Programs\, this festival runs the whole month of April and features partners that creates a larger community of astronomy enthusiasts that span the globe. \nLinks:\nGlobal Astronomy Month 2026
URL:https://www.a3veen.nl/event/gam2026-global-astronomy-month-2026/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20260402T002400
DTEND;TZID=Europe/Amsterdam:20260411T235900
DTSTAMP:20260519T015235
CREATED:20260124T012604Z
LAST-MODIFIED:20260423T083124Z
UID:135846-1775089440-1775951940@www.a3veen.nl
SUMMARY:Artemis II - mission
DESCRIPTION:Artemis II is a planned lunar spaceflight mission under the Artemis program\, led by NASA. It is intended to be the second flight of the Space Launch System (SLS)\, and is both the first crewed mission of the Orion spacecraft and the first crewed mission to the vicinity of the Moon since Apollo 17 in 1972. \nLaunch is scheduled for no earlier than April\, 2026. The 10-day mission will carry NASA astronauts Reid Wiseman\, Victor Glover\, and Christina Koch\, along with Canadian Space Agency astronaut Jeremy Hansen\, on a free-return trajectory around the Moon and back to Earth. Glover will become the first person of color\, Koch the first woman\, and Hansen the first non-American to travel to the Moon. The flight will take the crew farther from Earth than any previous human mission before reentering Earth’s atmosphere at a record speed of approximately 40\,000 km/h. Artemis II was originally designated Exploration Mission-2 (EM-2) and was initially intended to support the now-canceled Asteroid Redirect Mission. Its objectives were revised following the establishment of the Artemis program. The Artemis II mission plan is to send four astronauts in the first crewed Orion spacecraft into a lunar flyby using the Block 1 variant of the Space Launch System. The mission profile is a multi-trans-lunar injection (MTLI)\, or multiple departure burns\, and includes a free-return trajectory from the Moon. The Orion spacecraft will be sent to a high Earth orbit with a period of roughly 24 hours. During this time the crew will perform various checkouts of the spacecraft’s life support systems as well as an in-space rendezvous and proximity operations demonstration using the spent Interim Cryogenic Propulsion Stage (ICPS) as a target. When Orion reaches perigee once again\, it will fire its main engine to complete the TLI maneuver\, which will send it onto a lunar free-return trajectory\, before returning to Earth. Artemis II will test and demonstrate optical communications to and from Earth using the Orion Artemis II Optical Communications System (O2O). The O2O hardware will be integrated into the Orion spacecraft and includes an optical module (a 100 mm telescope and two gimbals)\, a modem and control electronics. O2O will communicate with ground stations in California and New Mexico. The test device will send data to Earth with a downlink rate of up to 260 megabits per second. \nNASA concluded a wet dress rehearsal for the agency’s Artemis II test flight early Tuesday morning February 3\, 2026\, successfully loading cryogenic propellant into the SLS (Space Launch System) tanks\, sending a team out to the launch pad to closeout Orion\, and safely draining the rocket. The wet dress rehearsal was a prelaunch test to fuel the rocket\, designed to identify any issues and resolve them before attempting a launch. Engineers pushed through several challenges during the two-day test and met many of the planned objectives. To allow teams to review data and conduct a second wet dress rehearsal. NASA will roll the SLS (Space Launch System) rocket and Orion spacecraft for Artemis II off the launch pad at the agency’s Kennedy Space Center in Florida as soon as Tuesday\, Feb. 24. On Feb. 21\, managers decided to remove recently installed platforms before high winds descend on the Space Coast\, which poised teams for rollback while discussions about the issue were ongoing. Returning to the Vehicle Assembly Building at Kennedy is required to determine the cause of the issue and fix it. Once NASA’s Artemis II SLS (Space Launch System) rocket and Orion spacecraft arrived at the Vehicle Assembly Building (VAB) Feb. 25\, technicians immediately began addressing why the flow of helium to the SLS upper stage was interrupted as engineers were reconfiguring the rocket following a successful wet dress rehearsal on Feb. 21. To make the repairs\, teams are installing two sets of internal access platforms inside the launch vehicle stage adapter and must remove thermal blankets that cover the area they are interested in – a point on the rocket’s interim cryogenic propulsion system\, or upper stage. The area provides connections for multiple umbilicals\, including tubing used to fill the upper stage with helium. Helium is used to maintain proper environmental conditions\, and to pressurize the stage for flight. \nOn Friday\, March 20\, NASA’s Artemis II SLS rocket and Orion spacecraft arrived at Launch Pad 39B after an 11-hour journey from the Vehicle Assembly Building at the agency’s Kennedy Space Center in Florida. NASA’s crawler-transporter 2 began its  6 km trek with the integrated SLS and Orion stacked on top of the mobile launcher at 18:20 CEST. The crawler carried the Moon rocket and spacecraft slowly and steadily toward the pad. At Pad 39B\, NASA teams were gearing up for the final stretch of prelaunch preparations ahead of launch as soon as Thursday\, April 2 at 00:24 CEST. The early April launch window includes opportunities through Monday\, April 6. NASA’s SLS rocket lifted off at 00:35 CEST Wednesday April 2 sending four astronauts aboard the Orion spacecraft on a planned test flight around the Moon and back. After the mission management team polled “Go” Thursday\, NASA’s Orion spacecraft fired its main engine for five minutes and 50 seconds beginning April 3 at 01:49 CEST\, to successfully complete the translunar injection (TLI) burn\, sending the crew in Orion out of Earth orbit and on a trajectory toward the Moon. On April 7\, the Artemis II mission wrapped up a seven-hour lunar flyby\, marking humanity’s first return to the Moon since Apollo 17 in 1972 and capturing images of the lunar far side. The momentous day began at 01:02:51 CEST as the astronauts set the record for the farthest distance from Earth traveled by any human. During a planned 40-minute loss of signal as Orion passed behind the Moon\, the spacecraft and its crew made their closest approach at 01:00:46 CEST\, flying at about 6544 kilometer above the surface. Two minutes later\, the crew reached the mission’s maximum distance from Earth at 406.771 km\, setting a new record for human spaceflight. The Orion spacecraft is scheduled to splash down off the coast of San Diego at approximately 02:07 on Saturday\, April 11 (CEST). \nLinks:\nArtemis II\, at NASA \nMission Overview\, at NASA \nArtemis II “Send Your Name to Space”\, at NASA \nFocus : Mens op de maan \nArtemis 2 moon mission shouldn’t launch until late 2026\, new analysis of solar superflares suggests \nHistorische maanvlucht van start: ‘Heftiger nu er mensen aan boord zijn’ \nWat hébben we nu eigenlijk aan een menselijke maanlanding? \nArtemisprogramma / Artemis program : Artemis II
URL:https://www.a3veen.nl/event/artemis-ii-launch/
CATEGORIES:Astronomie,Maan
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260412
DTEND;VALUE=DATE:20260413
DTSTAMP:20260519T015235
CREATED:20260412T141605Z
LAST-MODIFIED:20260412T141605Z
UID:139214-1775952000-1776038399@www.a3veen.nl
SUMMARY:#HumanSpaceFlightDay / Dag van de Ruimtevaart 2026
DESCRIPTION:The UN General Assembly\, in its resolution A/RES/65/271 of 7 April 2011\, declared 12 April as the International Day of Human Space Flight “to celebrate each year at the international level the beginning of the space era for mankind\, reaffirming the important contribution of space science and technology in achieving sustainable development goals and increasing the well-being of States and peoples\, as well as ensuring the realization of their aspiration to maintain outer space for peaceful purposes.” \n12 April 1961 was the date of the first human space flight\, carried out by Yuri Gagarin\, a Soviet citizen. This historic event opened the way for space exploration for the benefit of all humanity. The General Assembly expressed its deep conviction of the common interest of mankind in promoting and expanding the exploration and use of outer space\, as the province of all mankind\, for peaceful purposes and in continuing efforts to extend to all States the benefits derived there from. \nLinks:\nDay of Human Space Flight 12 April
URL:https://www.a3veen.nl/event/humanspaceflightday-dag-van-de-ruimtevaart-2026/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20260413T080000
DTEND;TZID=Europe/Amsterdam:20260413T170000
DTSTAMP:20260519T015235
CREATED:20260413T080121Z
LAST-MODIFIED:20260414T140743Z
UID:139234-1776067200-1776099600@www.a3veen.nl
SUMMARY:The Sky at Night – Destination Moon (TV BBC Four / BBC iPlayer)
DESCRIPTION:The Sky at Night is a monthly documentary television programme on astronomy produced by the BBC. \nThe show had the same permanent presenter\, Patrick Moore\, from its first broadcast on 24 April 1957 until 7 January 2013. The latter date was a posthumous broadcast\, which followed Moore’s death on 9 December 2012. This made it the longest-running programme with the same presenter in television history. Many early episodes are missing\, either because the tapes were wiped\, thrown out\, or because the episode was broadcast live and never recorded in the first place. Beginning with the 3 February 2013 edition\, the show was co-presented by Lucie Green and Chris Lintott. Since December 2013 Maggie Aderin-Pocock has been a presenter. The programme’s opening and closing theme music is “At the Castle Gate”\, from the incidental music to Pelléas et Mélisande\, written in 1905 by Jean Sibelius\, performed by the Royal Philharmonic Orchestra and conducted by Sir Thomas Beecham. \nThis episode:\nMaggie Aderin\, self-proclaimed lunar-tic\, examines Nasa’s Artemis II mission: the first crewed journey towards the moon in more than 50 years. It’s a mission designed to carry astronauts around the moon’s far side and safely home again\, marking the furthest human beings will have travelled into space. While the programme explores the mission’s progress on and off the launch pad as Artemis II prepares for its next attempt at lift-off\, George Dransfield visits Imperial College London to speak with Dr Helen Sharman\, who became the first British astronaut in 1991 when she travelled to the Mir space station. Helen offers insight into what it’s like to wait for launch and why the moon is once again drawing the world’s attention. \nBut the renewed focus on the moon goes beyond sending people there. A series of robotic landers has recently attempted to reach the lunar surface\, with mixed outcomes. To understand this new phase of exploration\, Maggie heads to the Open University to meet Dr Simeon Barber\, who is developing his latest lunar instrument. Not every mission carrying his instruments has succeeded\, but as he explains\, setbacks are as informative as successes and form part of the fast-moving international effort to return to the moon. But it’s not only astronauts and robots that get the chance to study our closest neighbour. We all see it as we go about our everyday lives\, and Pete Lawrence is on hand to highlight what to look out for if you pause for a moment\, glance upward and take in its quiet beauty. \nIt is the slow and steady progress of China’s Chang’e programme that brought back the first samples from the moon’s far side in 2024. Chris Lintott meets Professor Yang Li at University College London to find out what those samples are telling Yang and his team\, and the clues it gives us to a long-standing puzzle: the stark differences between the near and far sides of our lunar neighbour. These developing insights only strengthen the desire to explore further. To understand what Artemis II might contribute\, Maggie speaks with Nasa’s Dr Kelsey Young\, who leads the mission’s lunar science objectives. She explains what the first people to see the moon up close in more than half a century are trained to be looking out for. \nWill Artemis II be sweeping around the moon by the time this programme airs\, or will we be waiting a little longer for lift-off? Whatever happens with the journey back to the moon\, the story is advancing\, whether Artemis II flies or not. There are new scientific clues already coming from lunar samples\, and robotic landers still pushing forward with fresh attempts and data. The moon’s secrets\, history and untapped potential keep drawing us back\, urging us to look up and explore the lunar surface once again. \nLinks:\nThe Sky at Night
URL:https://www.a3veen.nl/event/the-sky-at-night-space-mysteries-destination-moon-tv-bbc-four/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20260416T200000
DTEND;TZID=Europe/Amsterdam:20260416T210000
DTSTAMP:20260519T015235
CREATED:20260416T082439Z
LAST-MODIFIED:20260417T082510Z
UID:139532-1776369600-1776373200@www.a3veen.nl
SUMMARY:Babelsberger Sternennächte – Exoplaneten-Atmosphären - Von regnenden Rubinen bis zur Suche nach Leben | Dr. Fabio Lesjak (TV webcast)
DESCRIPTION:Die Leibniz-Instituts für Astrophysik Potsdam (AIP) Babelsberger Sternennächte finden online statt\, in der Regel gibt es immer am 3. Donnerstag im Monat einen neuen Vortrag einer Wissenschaftlerin oder eines Wissenschaftlers des AIP\, der ab 20 Uhr auf dem YouTube-Kanal von Urknall\, Weltall und das Leben ausgestrahlt wird. \nDr. Fabio Lesjak\, Wissenschaftler in der Forschungsgruppe Sternphysik und Exoplaneten am AIP\, spricht zu „Exoplaneten-Atmosphären – Von regnenden Rubinen bis zur Suche nach Leben“. Ähnlich wie die Planeten in unserem Sonnensystem sind viele Exoplaneten von Atmosphären umgeben. Durch die Untersuchung dieser Atmosphären mit Hilfe hochauflösender Spektroskopie können Forschende Rückschlüsse auf die Zusammensetzung der Atmosphäre\, ihre Temperatur und sogar über vorherrschende Winde ziehen. \n\nLinks:\nBabelsberger Sternennächte \nBabelsberger Sternennächte – playlist
URL:https://www.a3veen.nl/event/babelsberger-sternennachte-exoplaneten-atmospharen-von-regnenden-rubinen-bis-zur-suche-nach-leben-dr-fabio-lesjak-tv-webcast/
CATEGORIES:Astronomie,Exoplaneet
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260418
DTEND;VALUE=DATE:20260419
DTSTAMP:20260519T015235
CREATED:20260418T175520Z
LAST-MODIFIED:20260418T175520Z
UID:139576-1776470400-1776556799@www.a3veen.nl
SUMMARY:Meteorenzwerm α-Virginiden in april 2026
DESCRIPTION:De meteorenzwerm α-Virginiden bereikt op zaterdag 18 april 2026\, rond 11:00\, zijn maximum. \nWanneer de radiant in het zenit zou staan\, zouden er van deze zwerm naar verwachting gemiddeld zo’n 5 meteoren per uur vallen. Rond 01:00 staat de radiant van de zwerm in het hoogste punt (op 36°) aan de hemel. Er is dan bij ons ieder uur slechts een enkele meteoor van deze zwerm zichtbaar. In totaal zijn er\, door meteoren van andere zwermen en sporadische meteoren\, bij donkere en heldere hemel circa 5–10 “vallende sterren” per uur te zien. Op een goed donkere plek zijn circa drie keer zoveel meteoren zichtbaar als in een grote stad. De Maan komt om 06:31 op\, is voor ongeveer 0% verlicht en stoort niet. Rond 06:00 gaat het schemeren en om 06:36 komt de Zon op. \nLinks:\nMeteorenzwerm α-Virginiden in april 2026
URL:https://www.a3veen.nl/event/meteorenzwerm-%ce%b1-virginiden-in-april-2026/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260507
DTEND;VALUE=DATE:20260508
DTSTAMP:20260519T015235
CREATED:20260506T224927Z
LAST-MODIFIED:20260507T185753Z
UID:140278-1778112000-1778198399@www.a3veen.nl
SUMMARY:Meteorenzwerm η-Aquariden in mei 2026
DESCRIPTION:De meteorenzwerm η-Aquariden bereikt op donderdag 7 mei 2026\, rond 22:00\, zijn maximum\, de meteoren van de η-Aquariden zijn snel en hebben nalichtende sporen. \nWanneer de radiant in het zenit zou staan\, zouden er van deze zwerm naar verwachting gemiddeld zo’n 30 meteoren per uur vallen. De radiant van de zwerm staat rond 09:00 in het hoogste punt aan de hemel\, op 37° boven de horizon. Het beste moment om η-Aquariden waar te nemen is op 8 mei rond 04:45. De radiant van de zwerm staat dan ongeveer 14° boven de oostzuidoostelijke horizon\, dus niet zeer gunstig. Er is dan bij ons ieder uur niet meer dan één meteoor zichtbaar van deze zwerm. Samen met meteoren van andere zwermen\, en sporadische meteoren\, zijn er bij donkere\, heldere hemel in totaal circa 3–7 “vallende sterren” per uur te zien. De Maan komt om 02:53 op\, is voor ongeveer 65% verlicht en kan eventueel storen. Rond 05:15 gaat het schemeren en om 05:57 komt de Zon op. De meteoren van de meeste zwermen verschijnen niet allemaal op de dag van het maximum. Zo is gedurende circa 11 dagen rondom het maximum ruim de helft van het maximale aantal meteoren van de η-Aquariden te zien. Tot 25 dagen voor en na het maximum zijn nog meteoren van deze zwerm te herkennen. De zwerm heeft daarmee een vrij lange piek. Er zijn dus nog meer kansen\, voor het geval het in de nacht van het maximum niet helder is. Iedere dag verder weg van het maximum zijn er echter wel ongeveer 10% minder meteoren per uur te zien. De typische snelheden van de meteoren in deze zwerm zijn met circa 66 km/s (ongeveer 236.160 km/uur) relatief hoog. Meteoren waarnemen kan zonder speciale instrumenten. Wanneer het helder is\, volstaat het blote oog. \nLinks:\nMeteorenzwerm η-Aquariden in mei 2026
URL:https://www.a3veen.nl/event/meteorenzwerm-%ce%b7-aquariden-in-mei-2026/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20260511T230000
DTEND;TZID=Europe/Amsterdam:20260511T233000
DTSTAMP:20260519T015235
CREATED:20260510T220942Z
LAST-MODIFIED:20260511T182020Z
UID:140404-1778540400-1778542200@www.a3veen.nl
SUMMARY:The Sky at Night – Jodrell Bank: Tuning Into the Universe (TV BBC Four / BBC iPlayer)
DESCRIPTION:The Sky at Night is a monthly documentary television programme on astronomy produced by the BBC. \nThe show had the same permanent presenter\, Patrick Moore\, from its first broadcast on 24 April 1957 until 7 January 2013. The latter date was a posthumous broadcast\, which followed Moore’s death on 9 December 2012. This made it the longest-running programme with the same presenter in television history. Many early episodes are missing\, either because the tapes were wiped\, thrown out\, or because the episode was broadcast live and never recorded in the first place. Beginning with the 3 February 2013 edition\, the show was co-presented by Lucie Green and Chris Lintott. Since December 2013 Maggie Aderin-Pocock has been a presenter. The programme’s opening and closing theme music is “At the Castle Gate”\, from the incidental music to Pelléas et Mélisande\, written in 1905 by Jean Sibelius\, performed by the Royal Philharmonic Orchestra and conducted by Sir Thomas Beecham. \nThis episode:\nIt started 80 years ago with a field\, army surplus\, wartime radar and a visionary idea – and it changed how we see the universe forever. In this episode\, we step inside the remarkable story of Jodrell Bank Observatory and its towering Lovell Telescope\, an instrument that scientists have used to listen to the cosmos for almost 70 years. Taking us on this journey\, Maggie Aderin meets research scientist Dr Emmanuel K Bempong-Manful to discover how the team he is in decide who gets time on the renowned Lovell Telescope\, and what it can reveal. But connect this giant telescope with telescopes across the UK\, and it becomes the headquarters of E-Merlin. That gives astronomers incredible resolution with which to view the universe in ways never seen before – delivering powerful results that deepen our understanding of how the cosmos works. \nBut how did this site become home to such an iconic scientific landmark\, nestled in the Cheshire countryside? Professor Tim O’Brien takes Maggie on a tour of Jodrell Bank’s early history\, from its beginnings as a botanist’s field\, through the adaptation of wartime radar using army surplus\, to the construction of what was\, at the time\, the world’s largest steerable radio telescope – an ambition many believed impossible. Driven by the vision of Bernard Lovell\, the project ran dramatically over budget and needed a miracle to be completed – which arrived with the onset of the Cold War. \nAt the University of Manchester Library\, Chris Lintott joins Professor Danielle George\, GCHQ’s chief scientific adviser for national security\, to examine previously top-secret files revealing Jodrell Bank’s role at the height of Cold War tensions. From tracking potential intercontinental missiles to listening in on the Soviet race to the moon\, Chris uncovers the ingenious technologies and human stories playing out during one of the most perilous periods in modern history. Back at Jodrell Bank\, the telescope’s constant watch on the sky continues. George Dransfield meets PhD student Phoebe Ryder\, who is exploring how the Lovell’s extraordinary sensitivity can be adapted to study threats orbiting Earth – helping scientists anticipate potentially catastrophic collisions that could prevent any space launches – for years to come. Moving between past\, present and future\, this is a story of ambition\, ingenuity and quiet vigilance – a reminder that some of the most important frontiers are explored not just by looking deeper into space\, but by listening carefully to what the universe is telling us. \nLinks:\nThe Sky at Night
URL:https://www.a3veen.nl/event/the-sky-at-night-jodrell-bank-tuning-into-the-universe-tv-bbc-four-bbc-iplayer/
CATEGORIES:Astronomie
END:VEVENT
END:VCALENDAR