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#qianfan

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Dr. John Barentine FRAS<p>There are reports that the brightness of some of the Chinese <a href="https://astrodon.social/tags/Qianfan" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Qianfan</span></a> satellites is varying on short timescales. (e.g., <a href="https://www.satobs.org/seesat/Mar-2025/0049.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">satobs.org/seesat/Mar-2025/004</span><span class="invisible">9.html</span></a>) </p><p>This behavior suggests that these satellites (and possibly others) from the second Qianfan launch are currently tumbling in orbit.</p><p><a href="https://astrodon.social/tags/Space" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Space</span></a> <a href="https://astrodon.social/tags/Satellites" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Satellites</span></a> <a href="https://astrodon.social/tags/China" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>China</span></a> <a href="https://astrodon.social/tags/SpaceEnvironment" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SpaceEnvironment</span></a> <a href="https://astrodon.social/tags/LEO" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>LEO</span></a></p>
Dr. John Barentine FRAS<p>"It looks like there's no stopping the march of modern internet satellites, and many more look to be blighting our skies/potentially improving worldwide internet access in the near future."</p><p><a href="https://www.pcgamer.com/hardware/so-long-and-thanks-for-all-the-space-junk-china-based-starlink-competitor-spacesail-plans-to-have-15-000-satellites-deployed-by-2030-and-its-not-the-only-one-with-its-eyes-on-the-skies/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">pcgamer.com/hardware/so-long-a</span><span class="invisible">nd-thanks-for-all-the-space-junk-china-based-starlink-competitor-spacesail-plans-to-have-15-000-satellites-deployed-by-2030-and-its-not-the-only-one-with-its-eyes-on-the-skies/</span></a></p><p><a href="https://astrodon.social/tags/Space" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Space</span></a> <a href="https://astrodon.social/tags/China" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>China</span></a> <a href="https://astrodon.social/tags/SpaceX" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SpaceX</span></a> <a href="https://astrodon.social/tags/Starlink" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Starlink</span></a> <a href="https://astrodon.social/tags/SpaceSail" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SpaceSail</span></a> <a href="https://astrodon.social/tags/Qianfan" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Qianfan</span></a> <a href="https://astrodon.social/tags/SpaceEnvironment" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SpaceEnvironment</span></a> <a href="https://astrodon.social/tags/Satellites" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Satellites</span></a> <a href="https://astrodon.social/tags/Internet" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Internet</span></a></p>
Daniel Fischer<p>Brightness of the <a href="https://scicomm.xyz/tags/Qianfan" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Qianfan</span></a> Satellites: <a href="https://arxiv.org/abs/2409.20432" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">arxiv.org/abs/2409.20432</span><span class="invisible"></span></a> -&gt; "Observed magnitudes of Qianfan spacecraft range from 4 when they are near zenith to 8 when low in the sky. Nearly all of the observations can be modeled with a nadir-facing flat antenna panel and the underside of a zenith-facing solar array, both with Lambertian reflectance properties. These satellites will impact astronomical research unless their brightness is reduced."</p>
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