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BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20230701T171100
DTEND;TZID=Europe/Amsterdam:20290701T171100
DTSTAMP:20260518T211022
CREATED:20230809T130227Z
LAST-MODIFIED:20241120T082444Z
UID:93109-1688231460-1877620260@www.a3veen.nl
SUMMARY:Cosmic Vision : Euclid space telescope / Euclides
DESCRIPTION:Euclid is a visible to near-infrared space telescope developed by the European Space Agency (ESA) and the Euclid Consortium\, the objective of the Euclid mission is to better understand dark energy and dark matter by accurately measuring the acceleration of the universe. \nTo achieve this\, the Korsch-type telescope will measure the shapes of galaxies at varying distances from Earth and investigate the relationship between distance and redshift. Dark energy is generally accepted as contributing to the increased acceleration of the expanding universe\, so understanding this relationship will help to refine how physicists and astrophysicists understand it. Euclid’s mission advances and complements ESA’s Planck telescope (2009 to 2013). The mission is named after the ancient Greek mathematician Euclid. Euclid is a medium-class (“M-class”) mission and is part of the Cosmic Vision campaign of ESA’s Science Programme. This class of missions have an ESA budget cap at around €500 million. Euclid was chosen in October 2011 together with Solar Orbiter\, out of several competing missions. Prior to the Russian invasion of Ukraine\, the launch was scheduled on a Soyuz ST-B in 2023; following the invasion\, Euclid will instead be launched on a Falcon 9 Block 5 on 1 July 2023. \nLinks:\nEuclid \nHow to follow the Euclid launch live \nRuimtetelescoop Euclid wil uitvinden waar het heelal van gemaakt is \nEuclid test images tease of riches to come \nEuclid ‘dark universe’ telescope team will unveil new full-color images today (May 23) \nZoom into the first page of ESA Euclid’s great cosmic atlas \nSpace Warps – ESA Euclid / Euclid Galaxy Zoo – help us classify the shapes of galaxies
URL:https://www.a3veen.nl/event/euclid-space-telescope-euclides/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20240208T073300
DTEND;TZID=Europe/Amsterdam:20270208T170000
DTSTAMP:20260518T211022
CREATED:20240209T204257Z
LAST-MODIFIED:20240209T204747Z
UID:102637-1707377580-1802106000@www.a3veen.nl
SUMMARY:Plankton\, Aerosol\, Cloud\, ocean Ecosystem
DESCRIPTION:Plankton\, Aerosol\, Cloud\, ocean Ecosystem (PACE) is a NASA Earth-observing satellite mission that will continue and advance observations of global ocean color\, biogeochemistry\, and ecology\, as well as the carbon cycle\, aerosols and clouds. \nPACE will be used to identify the extent and duration of phytoplankton blooms and improve understanding of air quality. These and other uses of PACE data will benefit the economy and society\, especially sectors that rely on water quality\, fisheries and food security. After being proposed for cancellation under President Trump’s FY 2018 budget\, it was restored by Congress. The PACE project is managed by NASA Goddard Space Flight Center. The main instrument and bus were designed and built at Goddard Space Flight Center. On 4 February 2020\, NASA announced the selection of SpaceX to launch PACE on a Falcon 9\, at a total cost to NASA of US$80.4 million\, including the launch service and other mission-related costs. The total cost of the mission is $964 million\, which includes spacecraft construction\, launch\, and operations. PACE successfully launched on 8 February 2024 at 07:33. \nLinks:\nPACE
URL:https://www.a3veen.nl/event/plankton-aerosol-cloud-ocean-ecosystem/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20240625T232600
DTEND;TZID=Europe/Amsterdam:20391025T000000
DTSTAMP:20260518T211022
CREATED:20241025T055924Z
LAST-MODIFIED:20241025T211716Z
UID:115444-1719357960-2203113600@www.a3veen.nl
SUMMARY:GOES-19
DESCRIPTION:GOES-19 (designated GOES-U prior to reaching geostationary orbit) is a weather satellite\, the fourth and last of the GOES-R series of satellites operated by the National Oceanic and Atmospheric Administration (NOAA). \nThe GOES-R series will extend the availability of the Geostationary Operational Environmental Satellite (GOES) system until 2036. The satellite is built by Lockheed Martin\, based on the A2100 platform. The satellite was successfully launched into space atop a SpaceX Falcon Heavy rocket on 25 June 2024 at 21:26 UTC from the Kennedy Space Center in Florida\, United States. The redesign of the loop heat pipe to prevent an anomaly\, as seen in GOES-17\, is not expected to delay the launch as it did with GOES-T. GOES-U also carries a copy of the Naval Research Laboratory’s Compact CORonagraph (CCOR) instrument which\, along with the CCOR planned for Space Weather Follow On-Lagrange 1 (SWFO-L1)\, will allow continued monitoring of solar wind after the retirement of the NASA–ESA SOHO satellite in 2025. GOES-U has a dry mass of 2\,925 kg and a fueled mass of 5\,000 kg. \nLinks:\nGEOS – R\n\nGOES-U Mission Overview \nSatellite: GOES-19 \nWatch sun erupt in 1st images from NOAA’s groundbreaking new satellite (photos)
URL:https://www.a3veen.nl/event/goes-19/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20240901
DTEND;VALUE=DATE:20290902
DTSTAMP:20260518T211022
CREATED:20240403T074223Z
LAST-MODIFIED:20240403T174651Z
UID:105492-1725148800-1883001599@www.a3veen.nl
SUMMARY:Proba-3 Missie / Proba-3 Mission
DESCRIPTION:By ESA\, CC BY-SA 3.0 igo\nProba-3 zijn twee minisatellieten van de Europese Ruimtevaartorganisatie (ESA)\, ze zullen samen gelanceerd worden in een langgerekte ellipsvormige baan met een perigeum van 600 km en apogeum van 60.000 km. \nProba-3 wordt gerealiseerd door een consortium van vijftien ESA-lidstaten met als hoofdaannemer het Spaanse SENER\, het Belgische Centre Spatial uit Luik als hoofdaannemer voor de coronagraaf en het Belgische Redwire Space voor assemblage en testen. Tijdens de missie zullen twee satellieten in formatie vliegen en samen een 144 meter lange zonnecoronagraaf vormen om de corona van de zon bij de zonnerand te bestuderen. Eén ruimtevaartuig zal de optische telescoop dragen en het tweede ruimtevaartuig zal een deel van de coronagraaf dragen. Tevens worden tijdens deze missie metingen uitgevoerd voor de positionering van twee ruimtevaartuigen. \nLinks:\nProba-3 Mission
URL:https://www.a3veen.nl/event/proba-3-missie-proba-3-mission/
CATEGORIES:Astronomie,Zon
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20241007T165200
DTEND;TZID=Europe/Amsterdam:20261231T235900
DTSTAMP:20260518T211022
CREATED:20240415T075035Z
LAST-MODIFIED:20241024T161412Z
UID:106201-1728319920-1798761540@www.a3veen.nl
SUMMARY:Hera space mission
DESCRIPTION:Hera is a space mission in development at the European Space Agency in its Space Safety program\, its primary objective is to study the Didymos binary asteroid system that was impacted by DART and contribute to validation of the kinetic impact method to deviate a near-Earth asteroid in a colliding trajectory with Earth. \nIt will measure the size and the morphology of the crater created by and momentum transferred by an artificial projectile impacting an asteroid\, which will allow measuring the efficiency of the deflection produced by the impact. It will also analyze the expanding debris cloud caused by the impact. The spacecraft was launched on 7 October 2024 and will also study the results of DART impactor\, four years after NASA’s mission. DART impacted the asteroid Dimorphos\, the smaller of two objects forming the binary asteroid 65803 Didymos\, on 27 September 2022. Hera has a mass of 1128 kilograms and carries a payload of cameras\, an altimeter\, and a spectrometer. It will also carry two nano-satellite CubeSats\, called Milani and Juventas. Hera will fully characterise the composition and physical properties of the binary asteroid system including\, for the first time\, the sub-surface and internal structures. It will also perform technological demonstrations linked to operations in the vicinity of a small body and the deployment and the communication with CubeSats in interplanetary space. \nHera’s launch kit\, click picture to read\nLinks:\nESA Hera \nThermophysical Modelling of Eclipse and Occultation Events in Binary Asteroid Systems \nPlanetary defence mission Hera heading for deflected asteroid \nSpaceX rocket launches Europe’s Hera planetary defense probe to visit asteroid smacked by NASA
URL:https://www.a3veen.nl/event/hera-space-mission/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20241014T120600
DTEND;TZID=Europe/Amsterdam:20301014T235900
DTSTAMP:20260518T211022
CREATED:20240428T043612Z
LAST-MODIFIED:20241014T151635Z
UID:106946-1728907560-1918252740@www.a3veen.nl
SUMMARY:NASA’s Europa Clipper Mission
DESCRIPTION:Europa Clipper (previously known as Europa Multiple Flyby Mission) is a space probe in development by NASA. \nPlanned for launch aboard a Falcon Heavy in October 2024 (the 21-day launch window period opens on October 10\, 2024)\, the spacecraft is being developed to study the Galilean moon Europa through a series of flybys while in orbit around Jupiter\, it is the largest spacecraft NASA has ever developed for a planetary mission. This mission is a scheduled flight of the Planetary Science Division\, designated a Large Strategic Science Mission\, and funded under the Planetary Missions Program Office‘s Solar System Exploration program as its second flight. It is also supported by the new Ocean Worlds Exploration Program. Europa Clipper will perform follow-up studies to those made by the Galileo spacecraft during its eight years (1995 – 2003) in Jupiter orbit\, which indicated the existence of a subsurface ocean underneath Europa’s ice crust. Plans to send a spacecraft to Europa were initially conceived with projects such as Europa Orbiter and Jupiter Icy Moons Orbiter\, in which a spacecraft would be injected into orbit around Europa. However\, due to the adverse effects of radiation from Jupiter’s magnetosphere in Europa orbit\, it was decided that it would be safer to inject a spacecraft into an elliptical orbit around Jupiter and make 44 close flybys of the moon instead. The mission began as a joint investigation between the Jet Propulsion Laboratory (JPL) and the Applied Physics Laboratory (APL)\, and will be built with a scientific payload of nine instruments contributed by JPL\, APL\, Southwest Research Institute\, University of Texas at Austin\, Arizona State University and University of Colorado Boulder. The upcoming mission complements ESA‘s Jupiter Icy Moons Explorer launched in 2023\, which will fly-by Europa twice and Callisto multiple times before moving into orbit around Ganymede. The spacecraft will use gravity assists from Mars in February 2025 and Earth in December 2026\, before arriving at Europa in April 2030. NASA will provide live coverage of prelaunch and launch activities for Europa Clipper\, the agency’s mission to explore Jupiter’s icy moon Europa. NASA now is targeting launch no earlier than 18:06 CEST\, Monday\, Oct. 14\, on a SpaceX Falcon Heavy rocket from Launch Complex 39A at NASA’s Kennedy Space Center in Florida. \nLinks:\nNASA’s Europa Clipper Mission \nEuropa Clipper \nThe search for life on Jupiter’s moon Europa – the Europa Clipper Mission \n8 Things to Know About NASA’s Mission to an Ocean Moon of Jupiter \nNASA\, SpaceX Secure Europa Clipper Ahead of Hurricane (Milton)
URL:https://www.a3veen.nl/event/nasas-europa-clipper-mission/
CATEGORIES:Astronomie,Jupiter
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20250110
DTEND;VALUE=DATE:20270101
DTSTAMP:20260518T211022
CREATED:20250124T135940Z
LAST-MODIFIED:20250324T142655Z
UID:122257-1736467200-1798761599@www.a3veen.nl
SUMMARY:Save the Observatory Science Centre Herstmonceux - petition
DESCRIPTION:The Observatory Science Centre is an educational charity which has called the Grade II listed\, former home of the Royal Greenwich Observatory at Herstmonceux\, East Sussex\, home for the last 30 years. \nThe Canadian landlords\, Queen’s University\, who also own Herstmonceux Castle\, are not renewing the Science Centre’s lease\, so come the end of the 2026 season the Science Centre will be homeless. Over the years the science centre have worked tirelessly to fund and restore the site and the telescopes back to their former glory. The centre is a major venue for exhibitions\, lectures and educational programmes. The renovated telescopes provide a unique setting for the general public\, schools\, colleges\, and brownie and scout groups to learn about science\, space and the world around them. Whilst the Science Centre is in search for a new site to continue operations beyond 2026\, they should not have to leave the Observatory site at all and the historic site should be preserved for future generations as a great educational tool of significant historical importance. Please sign this petition for someone to step in and prevent the Science Centre from having to leave the Observatory site. \nLinks:\nSave the Observatory Science Centre Herstmonceux \nHerstmonceux Observatory Campaign Group
URL:https://www.a3veen.nl/event/save-the-observatory-science-centre-herstmonceux-petition/
CATEGORIES:Astronomie,Cultuur
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20250429
DTEND;VALUE=DATE:20300430
DTSTAMP:20260518T211022
CREATED:20250410T010724Z
LAST-MODIFIED:20250410T111116Z
UID:123054-1745884800-1903737599@www.a3veen.nl
SUMMARY:Biomass : ESA's forest mission
DESCRIPTION:Biomass is an Earth observing satellite planned for launch by the European Space Agency (ESA) on 29 April 2025 from Kourou\, French Guiana on a Vega C launch vehicle\, the mission will provide the first comprehensive measurements of global forest biomass. \nIt is meant to last for five years\, monitoring at least eight growth cycles in the world’s forests. The Biomass satellite is part of ESA’s Living Planet Programme\, which consists of Earth observation missions. Its initial launch date was set to 2020\, but that has since been delayed to 2025. The entire cost of the mission was placed at around 400 million euros. The main scientific instrument aboard Biomass will be a synthetic aperture radar (SAR) operating at 435 MHz. The satellite will measure 10 x 12 x 20m\, weigh around 1.2 tonnes and it is set to orbit the Earth at an altitude of 666 km. All devices for assembly of the satellite structure\, including vertical transport equipment\, assembly and disassembly of satellite panels\, assembly and disassembly of the Synthetic Aperture Radar are done by the Spanish company SENER. \nLinks:\nBiomass – ESA \n#ForestDay #IntlForestDay Day of Forests / Dag van het Bos 2025 (TV FAO webcast)
URL:https://www.a3veen.nl/event/biomass-esas-forest-mission/
CATEGORIES:Astronomie,Biologie,Bossen,kennis,Natuur
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20250601
DTEND;VALUE=DATE:20500701
DTSTAMP:20260518T211022
CREATED:20250212T044128Z
LAST-MODIFIED:20260416T132733Z
UID:120180-1748736000-2540246399@www.a3veen.nl
SUMMARY:Vera C. Rubin Observatory
DESCRIPTION:The Vera C. Rubin Observatory\, formerly known as the Large Synoptic Survey Telescope (LSST)\, is an astronomical observatory in Chile\, its main task will be carrying out a synoptic astronomical survey\, the Legacy Survey of Space and Time. \nThe word “synoptic” is derived from the Greek words σύν (syn ’together’) and ὄψις (opsis ‘view’)\, and describes observations that give a broad view of a subject at a particular time. The observatory is located on the El Peñón peak of Cerro Pachón\, a 2\,682-meter-high mountain in Coquimbo Region\, in northern Chile\, alongside the existing Gemini South and Southern Astrophysical Research Telescopes. The LSST Base Facility is located about 100 kilometres away from the observatory by road\, in the city of La Serena. The observatory is named for Vera Rubin\, an American astronomer who pioneered discoveries about galactic rotation rates. The Rubin Observatory will house the Simonyi Survey Telescope\, a wide-field reflecting telescope with an 8.4-meter primary mirror that will photograph the entire available sky every few nights. The telescope uses a novel three-mirror design\, a variant of three-mirror anastigmat\, which allows a compact telescope to deliver sharp images over a very wide 3.5-degree-diameter field of view. Images will be recorded by a 3.2-gigapixel charge-coupled device imaging (CCD) camera\, the largest digital camera ever constructed. \nThe LSST was proposed in 2001\, and construction of the mirror began (with private funds) in 2007. LSST then became the top-ranked large ground-based project in the 2010 Astrophysics Decadal Survey\, and the project officially began construction on 1 August 2014\, when the United States National Science Foundation (NSF) authorized the FY2014 portion ($27.5 million) of its construction budget. Funding comes from the NSF\, the United States Department of Energy\, and private funding raised by the dedicated international non-profit organization\, the LSST Discovery Alliance. Operations are under the management of the Association of Universities for Research in Astronomy (AURA). The total construction cost is expected to be about $680 million. Site construction began on 14 April 2015 with the ceremonial laying of the first stone. The first on-sky observations with the engineering camera occurred on 24 October 2024\, while system first light images were released 23 June 2025. Full survey operations are planned to begin later in 2025\, due to COVID-related schedule delays. Rubin Observatory data is scheduled to become fully public after two years. \nLinks:\nVera C. Rubin Observatory \nThe Rewriting of a Pioneering Female Astronomer’s Legacy Shows How Far Trump’s DEI Purge Will Go \nFirst celestial image unveiled from revolutionary telescope \nEarly Data from NSF–DOE Vera C. Rubin Observatory Reveals Over 11\,000 New Asteroids
URL:https://www.a3veen.nl/event/vera-c-rubin-observatory-expected-opening/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20251109T204500
DTEND;TZID=Europe/Amsterdam:20280509T000000
DTSTAMP:20260518T211022
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
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BEGIN:VEVENT
DTSTART;VALUE=DATE:20261001
DTEND;VALUE=DATE:20311002
DTSTAMP:20260518T211022
CREATED:20231118T192401Z
LAST-MODIFIED:20231118T192532Z
UID:98841-1790812800-1948665599@www.a3veen.nl
SUMMARY:Nancy Grace Roman Space Telescope
DESCRIPTION:The Nancy Grace Roman Space Telescope (shortened as Roman or the Roman Space Telescope\, and formerly the Wide-Field Infrared Survey Telescope or WFIRST) is a NASA infrared space telescope in development and scheduled to launch by May 2027. \nThe Roman Space Telescope is based on an existing 2.4 m wide field of view primary mirror and will carry two scientific instruments. The Wide-Field Instrument (WFI) is a 300.8-megapixel multi-band visible and near-infrared camera\, providing a sharpness of images comparable to that achieved by the Hubble Space Telescope over a 0.28 square degree field of view\, 100 times larger than imaging cameras on the Hubble. The Coronagraphic Instrument (CGI) is a high-contrast\, small field of view camera and spectrometer covering visible and near-infrared wavelengths using novel starlight-suppression technology. Stated objectives include a search for extra-solar planets using gravitational microlensing\, along with probing the chronology of the universe and growth of cosmic structure\, with the end goal of measuring the effects of dark energy\, the consistency of general relativity\, and the curvature of spacetime. As of July 2022\, Roman is scheduled to be launched on a Falcon Heavy rocket under a contract specifying readiness by October 2026 supporting a NASA launch commitment of May 2027. \nLinks:\nNancy Grace Roman Space Telescope
URL:https://www.a3veen.nl/event/nancy-grace-roman-space-telescope/
CATEGORIES:Astronomie
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BEGIN:VEVENT
DTSTART;VALUE=DATE:20270802
DTEND;VALUE=DATE:20270803
DTSTAMP:20260518T211022
CREATED:20240617T033130Z
LAST-MODIFIED:20240617T161020Z
UID:109578-1817164800-1817251199@www.a3veen.nl
SUMMARY:2027 solar eclipse
DESCRIPTION:Links:\n10 top tips for planning your 2027 solar eclipse trip
URL:https://www.a3veen.nl/event/2027-solar-eclipse/
CATEGORIES:Astronomie,Zon
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BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20270802T093100
DTEND;TZID=Europe/Amsterdam:20270802T144400
DTSTAMP:20260518T211022
CREATED:20260118T040223Z
LAST-MODIFIED:20260118T142223Z
UID:135504-1817199060-1817217840@www.a3veen.nl
SUMMARY:Total Solar eclipse of August 2\, 2027
DESCRIPTION:The solar eclipse of August 2\, 2027\, also known as the Eclipse of the Century\, is an upcoming total solar eclipse that will occur at the Moon’s descending node of orbit on Monday\, August 2\, 2027\, with a magnitude of 1.079. \nKlik op afbeelding voor origineel\nA solar eclipse occurs when the Moon passes between Earth and the Sun\, thereby totally or partly obscuring the image of the Sun for a viewer on Earth. A total solar eclipse occurs when the Moon’s apparent diameter is larger than the Sun’s\, blocking all direct sunlight\, turning day into darkness. Totality occurs in a narrow path across Earth’s surface\, with the partial solar eclipse visible over a surrounding region thousands of kilometres wide. Occurring about 2.5 hours before perigee (on August 2\, 2027\, at 7:25 UTC)\, the Moon’s apparent diameter will be larger. \nLinks:\nTotal Solar Eclipse Map – August 2\, 2027
URL:https://www.a3veen.nl/event/total-solar-eclipse-of-august-2-2027/
CATEGORIES:Astronomie,Maan,Zon
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BEGIN:VEVENT
DTSTART;VALUE=DATE:20290413
DTEND;VALUE=DATE:20290414
DTSTAMP:20260518T211022
CREATED:20040619T112855Z
LAST-MODIFIED:20250416T114408Z
UID:123274-1870732800-1870819199@www.a3veen.nl
SUMMARY:Asteroid Apophis Fly By / Apophis scheert langs de Aarde
DESCRIPTION:99942 Apophis (/əˈpɒfɪs/\, previously known by its provisional designation 2004 MN4) is a 370-meter diameter near-Earth asteroid that caused a brief period of concern in December 2004 because initial observations indicated a probability of up to 2.7% that it would hit Earth on April 13\, 2029. \nAdditional observations provided improved predictions that eliminated the possibility of an impact on Earth or the Moon in 2029. However\, until 2006\, a possibility remained that during the 2029 close encounter with Earth\, Apophis would pass through a gravitational keyhole\, a small region no more than about 0.5 mile wide\, or 0.8 km that would set up a future impact exactly seven years later on April 13\, 2036. This possibility kept it at Level 1 on the Torino impact hazard scale until August 2006\, when the probability that Apophis would pass through the keyhole was determined to be very small. By 2008\, the keyhole had been determined to be less than 1 km wide. During the short time when it had been of greatest concern\, Apophis set the record for highest rating on the Torino scale\, reaching level 4 on 27 December 2004. \nAs of 2014\, the diameter of Apophis is estimated to be approximately 370 metres (1\,210 ft). Preliminary observations by Goldstone radar in January 2013 effectively ruled out the possibility of an Earth impact by Apophis in 2036. By May 6\, 2013 (April 15\, 2013 observation arc)\, the probability of an impact on April 13\, 2036 had been eliminated. Using observations through February 26\, 2014\, the odds of an impact on April 12\, 2068\, as calculated by the JPL Sentry risk table are 1 in 150\,000. As of February 2019\, there were five asteroids with a more notable cumulative Palermo Technical Impact Hazard Scale than Apophis. On average\, one asteroid the size of Apophis (370 metres) can be expected to impact Earth about every 80\,000 years. \nLinks:\nNear-Earth Asteroid 2004 MN4 Reaches Highest Score To Date On Hazard Scale \nHuge Asteroid Apophis Flies By Earth on Friday the 13th in 2029. A Lucky Day for Scientists \nApophis: Asteroid doch auf Kollisionskurs? | Scientists prepare for their last good look at asteroid Apophis before 2029 flyby \nAsteroid Apophis makes a close sweep past Earth on March 5-6\, 2021 \nCan Green Bank Telescope Defend Against Asteroid Apophis? \nNASA Analysis: Earth Is Safe From Asteroid Apophis for 100-Plus Years
URL:https://www.a3veen.nl/event/asteroid-apophis-fly-by-apophis-scheert-langs-de-aarde/
CATEGORIES:Astronomie
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BEGIN:VEVENT
DTSTART;VALUE=DATE:20321222
DTEND;VALUE=DATE:20321223
DTSTAMP:20260518T211022
CREATED:20250130T074607Z
LAST-MODIFIED:20250414T154954Z
UID:119632-1987286400-1987372799@www.a3veen.nl
SUMMARY:Asteroid 2024 YR4 - chance of impacting Earth
DESCRIPTION:2024 YR4 is an asteroid that is classified as an Apollo-type (Earth-crossing) near-Earth object\, with an estimated diameter of 40 to 90 metres. \nCalculations using the observation arc of 55 days as of 18 February 2025\, it has a rating of 3 on the Torino scale\, with a 1-in-32 (3.1%) chance of impacting Earth on 22 December 2032 around 14:02 UT\, and a rating of −0.18 on the Palermo scale\, corresponding to an impact hazard 66.1% of the background level. This is the highest impact probability NASA has ever recorded for an object of this size or larger. However\, on Wednesday\, Feb. 19\, new data collected overnight reduced the impact probability to 1.5%. The uncertainty region for the path of its potential impact in 2032 is 1.1 million km wide. The nominal closest approach to Earth is on the 22nd at 10:02 UT (with an uncertainty in the closest approach time of about 8 hours and being 4 hours earlier than virtual impactor) at a distance of 198\,000 kilometres (0.52 lunar distances)\, with a 3-sigma uncertainty of 356\,000 kilometres (0.926 lunar distances). The nominal closest approach to Moon is seven hours later at 16:25 UT. Due to 2024 YR4’s size and greater-than-1% impact probability\, it is rated at Torino scale level 3\, which has prompted the International Asteroid Warning Network to issue a notice on 29 January 2025. This is the second-highest Torino scale rating an asteroid has ever reached\, behind 99942 Apophis which briefly ranked Torino scale level 4 in late 2004. NASA gives a Palermo scale rating of −0.18 for 2024 YR4\, which corresponds to an impact hazard of 66.1% of the background hazard level. The European Space Agency gives a Palermo scale rating of −0.20 with an impact probability of 2.81%\, while NEODyS gives −0.21 with an impact probability of 2.27%. \nThe asteroid was discovered by the Chilean station of the Asteroid Terrestrial-impact Last Alert System (ATLAS) on 27 December 2024. The discovery triggered the first step in planetary-defense responses\, prompting several major telescopes to gather data about the asteroid and leading United Nations–endorsed space agencies to begin planning asteroid threat mitigation. The asteroid made a close approach to Earth at a distance of 828\,800 kilometres (2.156 lunar distances) on 25 December 2024\, two days before its discovery\, and is now moving away. Its next close approach will take place on 17 December 2028. From early April 2025 to June 2028\, the asteroid is expected to be too distant for ground-based telescopes to observe. However\, space-based infrared telescopes could continue monitoring it during some of this period; for example\, the James Webb Space Telescope is scheduled to observe it between March and May 2025. Preliminary analysis of spectral and photometric time series suggests that 2024 YR4 is a stony S-type (most likely)\, L-type or K-type asteroid\, with a rotation period of approximately 19.5 minutes. A number of known asteroids\, including other virtual impactors\, follow orbits somewhat consistent with that of 2024 YR4. As of 23 February 2025 NASA gives Palermo scale rating of −3.45 for 2024 YR4\, which corresponds to an impact hazard of 0.08% of the background hazard level. NEODyS gives −4.38 with an impact probability of 0.000444%\, while the European Space Agency gives a Palermo scale rating of −3.55 with an impact probability of 0.00162%. \nUsing observations through 26 March 2025\, 2024 YR4 has around a 4% chance of impacting a 70% waning gibbous moon on 22 December 2032 around 15:17 to 15:21 UTC. The nominal approach to the Moon is near the impact scenario at around 15:18 UTC ± 1.5 hours at a distance of 3\,100 km (0.0081 LD) from the center of the Moon\, or about 1\,400 km above the 1\,737 km radius of the Moon\, with a 3-sigma uncertainty of 83\,000 km. The impact could create an impact crater with a diameter of 500 to 2\,000 metres wide on the lunar surface\, releasing about 5.2 megatonnes of TNT (21.8 petajoules) of energy if it were to impact the Moon at an estimated velocity of 13.9 km/s\, an explosion about 340 times more powerful than the Hiroshima bomb. The impact corridor is a line that extends through the southern parts of Mare Humorum and Mare Nubium. Michael Busch of the SETI Institute notes that an explosion on the Moon “would be very obvious to any spacecraft observing from lunar orbit” but may not be as visible to the unaided eye from Earth due to the Moon’s brightness. However\, other astronomers believe the impact could be visible from Earth. Gareth Collins suggested that “the impact flash of vaporized rock would be visible from Earth\, even in the daytime”\, while Daniel Bamberger of the Northolt Branch Observatories in London stated that the impact “could be brighter than the full moon” making it clearly visible to the naked eye. \n \nLinks:\nESA actively monitoring near-Earth asteroid 2024 YR4 \nNASA Shares Observations of Recently-Identified Near Earth Asteroid \n2024 YR4 – International Asteroid Warning Network \n2024 YR4 – Earth Impact Risk Summary \nKans op inslag van asteroïde 2024 YR4 op aarde steeds groter\, maar volgens deze ruimteonderzoeker hoeven we niet bang te zijn \nDark Skies Bring New Observations of Asteroid 2024 YR4\, Lower Impact Probability \nLatest Calculations Conclude Asteroid 2024 YR4 Now Poses No Significant Threat to Earth in 2032 and Beyond \nThe Sky at Night – Asteroid Strike? (TV BBC Four)
URL:https://www.a3veen.nl/event/asteroid-2024-yr4-chance-of-impacting-earth/
CATEGORIES:Astronomie
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