shakedown.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
A community for live music fans with roots in the jam scene. Shakedown Social is run by a team of volunteers (led by @clifff and @sethadam1) and funded by donations.

Administered by:

Server stats:

267
active users

#apophis

0 posts0 participants0 posts today
Michael Busch<p>Like <a href="https://mastodon.online/tags/Toutatis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Toutatis</span></a>, <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> is a tumbling contact-binary ordinary chondrite asteroid.</p><p>But Apophis is less than 10% the length of Toutatis and is thousands of times less massive.</p>
UK<p><a href="https://www.europesays.com/uk/215723/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="">europesays.com/uk/215723/</span><span class="invisible"></span></a> Chinese scientists push for cubesat swarm mission to fly by infamous asteroid Apophis <a href="https://pubeurope.com/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> <a href="https://pubeurope.com/tags/asteroid" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>asteroid</span></a> <a href="https://pubeurope.com/tags/China" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>China</span></a> <a href="https://pubeurope.com/tags/CubeSat" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CubeSat</span></a> <a href="https://pubeurope.com/tags/NearEarthObjects" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NearEarthObjects</span></a> <a href="https://pubeurope.com/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Science</span></a> <a href="https://pubeurope.com/tags/Space" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Space</span></a> <a href="https://pubeurope.com/tags/UK" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>UK</span></a> <a href="https://pubeurope.com/tags/UnitedKingdom" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>UnitedKingdom</span></a></p>
Michael Busch<p>Marta Ceccaroni has analyzed the effect of the <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> flyby in 2029 on debris in the graveyard orbits past geosynch.</p><p>Collision avoidance planning may need to take the perturbations into account - up to ~10 m in months after the flyby.</p><p><a href="https://mastodon.online/tags/PDC2025" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PDC2025</span></a></p>
Michael Busch<p>The <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> T-4 workshop wraps up with discussions about talking to the public about the flyby.</p><p>And cautions about the expected amount of disinformation.</p><p>"Apophis Communications Challenge" - <a href="https://www.hou.usra.edu/meetings/apophis2025/technical_program/?session_no=204" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">hou.usra.edu/meetings/apophis2</span><span class="invisible">025/technical_program/?session_no=204</span></a></p>
Michael Busch<p>In the next session of the <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> T-4 workshop; Wing Ip relates that Huang Jiangchuan, lead engineer for Chang'e 2, has a mission concept for a cubesat to be placed where Apophis would run by it: <a href="https://www.hou.usra.edu/meetings/apophis2025/pdf/2023.pdf" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">hou.usra.edu/meetings/apophis2</span><span class="invisible">025/pdf/2023.pdf</span></a> .</p><p>But, as for other proposals, funding is uncertain.</p>
Michael Busch<p><a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> T-4 continues today reviewing many other proposed space missions to the asteroid; in addition to the two spacecraft that are being built for that &amp; the one that is already in the sky: <a href="https://www.hou.usra.edu/meetings/apophis2025/technical_program/?session_no=201" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">hou.usra.edu/meetings/apophis2</span><span class="invisible">025/technical_program/?session_no=201</span></a></p><p>Three spacecraft may be enough, but there has been a lot of work on this.</p>
Michael Busch<p>The DESTINY+ team also presented a potential trajectory that would fly by <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a>, then by <a href="https://mastodon.online/tags/Phaethon" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Phaethon</span></a>, and then by <a href="https://mastodon.online/tags/2024YR4" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>2024YR4</span></a>.</p><p>But if this will be possible or not depends on the exact launch date out of Tanegashima.</p>
Michael Busch<p>The DESTINY+ mission team propose to launch that spacecraft in 2028; fly by <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> before the asteroid makes its flyby of Earth; and then go on to the asteroid Phaethon.</p><p>Per Tomoko Arai: <a href="https://www.hou.usra.edu/meetings/apophis2025/pdf/2061.pdf" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">hou.usra.edu/meetings/apophis2</span><span class="invisible">025/pdf/2061.pdf</span></a></p>
Michael Busch<p>The last session at the <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> T-4 workshop today is reviews of the <a href="https://mastodon.online/tags/OSIRISAPEx" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OSIRISAPEx</span></a> and <a href="https://mastodon.online/tags/RAMSES" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>RAMSES</span></a> spacecraft and what they are planned to do at the asteroid: </p><p><a href="https://www.hou.usra.edu/meetings/apophis2025/pdf/2019.pdf" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">hou.usra.edu/meetings/apophis2</span><span class="invisible">025/pdf/2019.pdf</span></a><br><a href="https://www.hou.usra.edu/meetings/apophis2025/pdf/2012.pdf" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">hou.usra.edu/meetings/apophis2</span><span class="invisible">025/pdf/2012.pdf</span></a></p>
Michael Busch<p>In planning optical observations of <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> between now and 2029; the possibility of Hubble no longer being available has to be considered.</p><p>All things are impermanent.</p>
Michael Busch<p>Cristina Thomas reviews optical observing plans for <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> in 2027 and 2028; to provide the best possible information prior to the flyby: <a href="https://www.hou.usra.edu/meetings/apophis2025/pdf/2066.pdf" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">hou.usra.edu/meetings/apophis2</span><span class="invisible">025/pdf/2066.pdf</span></a></p>
Michael Busch<p><a href="https://mastodon.online/tags/TeamRadar" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TeamRadar</span></a> <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> planning page, with the hope that we can do all of this 4 years from now: <a href="https://echo.jpl.nasa.gov/asteroids/apophis.2029.goldstone.planning.html" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">echo.jpl.nasa.gov/asteroids/ap</span><span class="invisible">ophis.2029.goldstone.planning.html</span></a></p>
Michael Busch<p><a href="https://mastodon.online/tags/TeamRadar" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TeamRadar</span></a> presentations at <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> T-4:</p><p>Benner et al., "Goldstone Radar Observations of 99942 Apophis in 2029: Detailed Plans" - <a href="https://www.hou.usra.edu/meetings/apophis2025/pdf/2058.pdf" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">hou.usra.edu/meetings/apophis2</span><span class="invisible">025/pdf/2058.pdf</span></a></p><p>Horiuchi et al., "Southern Hemisphere Asteroid Radar Program (SHARP) and the Apophis Encounter in 2029" - <a href="https://www.hou.usra.edu/meetings/apophis2025/pdf/2037.pdf" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">hou.usra.edu/meetings/apophis2</span><span class="invisible">025/pdf/2037.pdf</span></a></p>
Michael Busch<p>From the posters at the <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> T-4 workshop:</p><p>Titus et al., "Potential Terahertz and Microwave Observations of (99942) Apophis from Ground-Based Telescopes" - <a href="https://www.hou.usra.edu/meetings/apophis2025/pdf/2017.pdf" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">hou.usra.edu/meetings/apophis2</span><span class="invisible">025/pdf/2017.pdf</span></a> .</p><p>Describing how to observe the asteroid with ALMA; with comparison to other ALMA asteroid projects.</p>
Michael Busch<p>Oscar Fuentes-Muñoz, "Close Encounter Statistical History of 99942 Apophis" - <a href="https://www.hou.usra.edu/meetings/apophis2025/pdf/2057.pdf" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">hou.usra.edu/meetings/apophis2</span><span class="invisible">025/pdf/2057.pdf</span></a></p><p>2029 may be the closest approach <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> has ever made to Earth.</p>
Michael Busch<p>The <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> T-4 workshop begins with Rick Binzel reviewing the science case for studying the asteroid when it flies by in 2029; for everyone who has not spent two decades now thinking about it: <a href="https://www.hou.usra.edu/meetings/apophis2025/pdf/2003.pdf" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">hou.usra.edu/meetings/apophis2</span><span class="invisible">025/pdf/2003.pdf</span></a></p><p>And, as always:</p><p>Apophis will miss the Earth.</p>
Michael Busch<p>It has also been nearly 20 years now since I got to help observe <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> with the Arecibo Observatory as a <a href="https://mastodon.online/tags/TeamRadar" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TeamRadar</span></a> summer student.</p><p>Woah.</p>
Michael Busch<p>Random person: "Why are governments not talking about Apophis?"</p><p>Me: "They are, though."</p><p>QT Michael Busch @michael-w-busch.bsky.social‬<br>2025 April 7</p><p>It also happens that there is a workshop this week about <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a>: <a href="https://www.hou.usra.edu/meetings/apophis2025/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">hou.usra.edu/meetings/apophis2</span><span class="invisible">025/</span></a></p><p>With representatives from JAXA, NASA, ESA, and other agencies in attendance.<br><a href="https://bsky.app/profile/michael-w-busch.bsky.social/post/3lmagdegkws2p" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">bsky.app/profile/michael-w-bus</span><span class="invisible">ch.bsky.social/post/3lmagdegkws2p</span></a></p>
Michael Busch<p>For people interested in asteroid science:</p><p>There are <a href="https://mastodon.online/tags/HeraMission" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HeraMission</span></a> and <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> meetings this week, in Tokyo and online - <a href="https://www.hera-apophis-ramses-tokyo.org/en-us/meeting-schedule/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">hera-apophis-ramses-tokyo.org/</span><span class="invisible">en-us/meeting-schedule/</span></a></p>
Michael Busch<p>Next week. <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> </p><p>QT Michael Busch <span class="h-card" translate="no"><a href="https://mastodon.online/@michael_w_busch" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>michael_w_busch</span></a></span> <br>2025 March 21</p><p>For those interested in asteroids flying by the Earth:</p><p>The <a href="https://mastodon.online/tags/Apophis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Apophis</span></a> T-4 workshop will be happening in Tokyo and online in 3 weeks.<br><a href="https://www.hou.usra.edu/meetings/apophis2025/technical_program/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">hou.usra.edu/meetings/apophis2</span><span class="invisible">025/technical_program/</span></a></p>