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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://fosstodon.org/users/AkaSci/statuses/115417630995313244">AkaSci 🛰️ (akasci@fosstodon.org)'s status on Tuesday, 28-Oct-2025 07:40:34 JST</a><a href="https://fosstodon.org/@AkaSci" title="akasci@fosstodon.org"><img src="https://gnusocial.jp/avatar/20805-48-20221219024513.webp" width="48" height="48" alt="AkaSci 🛰️" style="position: absolute; left: 0; top: 0;">AkaSci 🛰️</a><div><a href="https://fosstodon.org/@AkaSci/115412691614131583" rel="in-reply-to">in reply to</a></div></section><article><p>Yet another outstanding image of Comet C/2025 A6 (Lemmon) by Petr Horálek taken on October 18, from the shore of Seč Lake, Czech Republic.</p><p>The pic also captures the aurora caused by a G2 geomagnetic storm that day and the storm's effect on the comet's long ion tail.<br>☄️<br>Also, watch the reflections.</p><p>Camera: Canon Ra, Sigma Art 50mm, f 1.4, ISO 4000, 43x8s.</p><p>Check out Petr's other works at <a href="https://www.petrhoralek.com/" rel="nofollow">https://www.petrhoralek.com/</a> and <a href="https://www.instagram.com/petrhoralek/?hl=en" rel="nofollow">https://www.instagram.com/petrhoralek/?hl=en</a><br><a href="https://fosstodon.org/tags/Comet" rel="tag">#Comet</a> <a href="https://fosstodon.org/tags/Lemmon" rel="tag">#Lemmon</a><br>12/n</p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/5677967#notice-11399367">In conversation</a><time datetime="2025-10-28T07:40:34+09:00" title="Tuesday, 28-Oct-2025 07:40:34 JST">about 24 days ago</time> <span>from <span><a href="https://fosstodon.org/@AkaSci/115417630995313244" rel="external" title="Sent from fosstodon.org via ActivityPub">fosstodon.org</a></span></span><a href="https://fosstodon.org/@AkaSci/115417630995313244">permalink</a><h4>Attachments</h4><ol><li><article><header><div>Domain not in remote thumbnail source whitelist: www.petrhoralek.com</div><h5><a href="https://www.petrhoralek.com/">Petr Horálek Photography</a></h5><div> from <span>Petr Horálek</span></div></header><div>Nightscape Photographer, ESO Photo Ambassador, IDA Delegate / Astrofotograf, Popularizátor Astronomie, Svatební Fotograf, Foto Interiérů a Exteriérů, Nabídka Velkofotmátových Fotoobrazů</div><footer></footer></article></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/5390369">Pic of the comet with the lake in the foreground and a crimson aurora lighting up the skyline.Instagram post by Petr:
SOLAR WIND IN COMET'S TAIL AND EARTH'S SKY: Yesterday evening, a truly unusual view was possible to capture from Seč Lake, Czech Republic. CME from the Sun hit the Earth, producing a G2 geomagnetic storm, including faint auroras even in mid-latitudes. As the comet C/2025 A6 Lemmon approaches Earth (in 2 days), the same cloud from the sun affected even the complicated ion tail of the comet. I succeeded with deeper imaging to reveal that moment in the tail as well as the aurora itself. It doesn't happen every day to capture the invisible solar wind in two sky phenomena at the same moment!</a></label><br><a href="https://cdn.fosstodon.org/media_attachments/files/115/417/582/489/496/463/original/6e85faa6c399e156.png" rel="external">https://cdn.fosstodon.org/media_attachments/files/115/417/582/489/496/463/original/6e85faa6c399e156.png</a></li><li><article><header><div>Domain not in remote thumbnail source whitelist: scontent-nrt1-1.cdninstagram.com</div><h5><a href="https://www.instagram.com/petrhoralek/?hl=en">Petr Horálek (@petrhoralek) • Instagram photos and videos</a></h5><div></div></header><div>30K Followers, 142 Following, 940 Posts - See Instagram photos and videos from Petr Horálek (@petrhoralek)</div><footer></footer></article></li></ol></footer></blockquote>

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AkaSci 🛰️ (akasci@fosstodon.org)'s status on Tuesday, 28-Oct-2025 07:40:34 JST AkaSci 🛰️
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Yet another outstanding image of Comet C/2025 A6 (Lemmon) by Petr Horálek taken on October 18, from the shore of Seč Lake, Czech Republic.
The pic also captures the aurora caused by a G2 geomagnetic storm that day and the storm's effect on the comet's long ion tail.
☄️
Also, watch the reflections.
Camera: Canon Ra, Sigma Art 50mm, f 1.4, ISO 4000, 43x8s.
Check out Petr's other works at https://www.petrhoralek.com/ and https://www.instagram.com/petrhoralek/?hl=en
#Comet #Lemmon
12/n
In conversationabout 24 days ago from fosstodon.orgpermalink
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1. Domain not in remote thumbnail source whitelist: www.petrhoralek.com
  Petr Horálek Photography
  from Petr Horálek
  Nightscape Photographer, ESO Photo Ambassador, IDA Delegate / Astrofotograf, Popularizátor Astronomie, Svatební Fotograf, Foto Interiérů a Exteriérů, Nabídka Velkofotmátových Fotoobrazů
2. Pic of the comet with the lake in the foreground and a crimson aurora lighting up the skyline. Instagram post by Petr: SOLAR WIND IN COMET'S TAIL AND EARTH'S SKY: Yesterday evening, a truly unusual view was possible to capture from Seč Lake, Czech Republic. CME from the Sun hit the Earth, producing a G2 geomagnetic storm, including faint auroras even in mid-latitudes. As the comet C/2025 A6 Lemmon approaches Earth (in 2 days), the same cloud from the sun affected even the complicated ion tail of the comet. I succeeded with deeper imaging to reveal that moment in the tail as well as the aurora itself. It doesn't happen every day to capture the invisible solar wind in two sky phenomena at the same moment!
  https://cdn.fosstodon.org/media_attachments/files/115/417/582/489/496/463/original/6e85faa6c399e156.png
3. Domain not in remote thumbnail source whitelist: scontent-nrt1-1.cdninstagram.com
  Petr Horálek (@petrhoralek) • Instagram photos and videos
  30K Followers, 142 Following, 940 Posts - See Instagram photos and videos from Petr Horálek (@petrhoralek)

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