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BEGIN:VEVENT
DTSTART;VALUE=DATE:20260412
DTEND;VALUE=DATE:20260413
DTSTAMP:20260518T220730
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:20260518T220730
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:20260518T220730
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:20260518T220730
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:20260518T220730
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:20260518T220730
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
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260518
DTEND;VALUE=DATE:20260519
DTSTAMP:20260518T220730
CREATED:20260517T173156Z
LAST-MODIFIED:20260517T173156Z
UID:140629-1779062400-1779148799@www.a3veen.nl
SUMMARY:2026 JH2 - closest approach to Earth
DESCRIPTION:2026 JH2 is a small near-Earth asteroid with a diameter between 15 and 35 metres. \nIt was discovered by the Mount Lemmon Survey in Tucson\, Arizona on 10 May 2026. Classified as an Earth-crossing Apollo asteroid\, 2026 JH2 will pass no closer than 91\,000 ± 4\,500 kilometres from Earth on 18 May 2026\, far enough to pose no threat. During its close approach to Earth\, it will brighten to an apparent magnitude of up to 11.5\, bright enough to be seen by a small telescope under dark skies. \nLinks:\n2026 JH2 \nGrote asteroïde scheert maandag ‘rakelings’ langs de aarde: “Zo dicht als je kan komen zonder te botsen”
URL:https://www.a3veen.nl/event/2026-jh2-closest-approach-to-earth/
CATEGORIES:Astronomie
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20261001
DTEND;VALUE=DATE:20311002
DTSTAMP:20260518T220730
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
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20270802
DTEND;VALUE=DATE:20270803
DTSTAMP:20260518T220730
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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Amsterdam:20270802T093100
DTEND;TZID=Europe/Amsterdam:20270802T144400
DTSTAMP:20260518T220730
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
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20290413
DTEND;VALUE=DATE:20290414
DTSTAMP:20260518T220730
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
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20321222
DTEND;VALUE=DATE:20321223
DTSTAMP:20260518T220730
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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