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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://mathstodon.xyz/users/johncarlosbaez/statuses/114476978070747621">John Carlos Baez (johncarlosbaez@mathstodon.xyz)'s status on Saturday, 10-May-2025 06:46:08 JST</a><a href="https://mathstodon.xyz/@johncarlosbaez" title="johncarlosbaez@mathstodon.xyz"><img src="https://gnusocial.jp/avatar/83718-48-20250418093131.webp" width="48" height="48" alt="John Carlos Baez" style="position: absolute; left: 0; top: 0;">John Carlos Baez</a><div><a href="https://mathstodon.xyz/@johncarlosbaez/114476953101402107" rel="in-reply-to">in reply to</a></div></section><article><p>Now here is a really *great* actual photo of Daphnis and the ripples it creates in Saturn's rings!</p><p>It was taken by the Cassini probe and released in February 2017.   It was taken in visible light using Cassini’s narrow-angle camera.  Cassini was 28,000 kilometers away from Daphnis, and the image scale is 168 meters per pixel.</p><p><a href="https://www.esa.int/About_Us/ESAC/Saturn_s_moon_Daphnis_in_the_Keeler_Gap" rel="nofollow noreferrer">https://www.esa.int/About_Us/ESAC/Saturn_s_moon_Daphnis_in_the_Keeler_Gap</a></p><p>What other really good photos can we find?  </p><p>(4/n)</p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/5030357#notice-9860605">In conversation</a><time datetime="2025-05-10T06:46:08+09:00" title="Saturday, 10-May-2025 06:46:08 JST">about 8 months ago</time> <span>from <span><a href="https://mathstodon.xyz/@johncarlosbaez/114476978070747621" rel="external" title="Sent from mathstodon.xyz via ActivityPub">mathstodon.xyz</a></span></span><a href="https://mathstodon.xyz/@johncarlosbaez/114476978070747621">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/4603404">An image of Daphnis from the ESA:https://www.esa.int/About_Us/ESAC/Saturn_s_moon_Daphnis_in_the_Keeler_GapThree wave crests of diminishing size can be seen here in the wake of the moon’s passage. In each subsequent crest, the shape of the wave evolves as the ring particles within the crests collide with one another.Zooming in towards the tiny moon reveals a faint, thin strand of ring material that almost appears to have been directly ripped out of the A-ring by Daphnis.The images of this feature were taken in visible light, using Cassini’s narrow-angle camera at a distance of about 28 000 km from Daphnis. Image scale is 168 m/pixel.</a></label><br><a href="https://media.mathstodon.xyz/media_attachments/files/114/478/043/236/097/550/original/bc39f9a84bff9dbc.jpg" rel="external">https://media.mathstodon.xyz/media_attachments/files/114/478/043/236/097/550/original/bc39f9a84bff9dbc.jpg</a></li></ol></footer></blockquote>

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John Carlos Baez (johncarlosbaez@mathstodon.xyz)'s status on Saturday, 10-May-2025 06:46:08 JST John Carlos Baez
in reply to
Now here is a really *great* actual photo of Daphnis and the ripples it creates in Saturn's rings!
It was taken by the Cassini probe and released in February 2017. It was taken in visible light using Cassini’s narrow-angle camera. Cassini was 28,000 kilometers away from Daphnis, and the image scale is 168 meters per pixel.
https://www.esa.int/About_Us/ESAC/Saturn_s_moon_Daphnis_in_the_Keeler_Gap
What other really good photos can we find?
(4/n)
In conversationabout 8 months ago from mathstodon.xyzpermalink
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1. An image of Daphnis from the ESA: https://www.esa.int/About_Us/ESAC/Saturn_s_moon_Daphnis_in_the_Keeler_Gap Three wave crests of diminishing size can be seen here in the wake of the moon’s passage. In each subsequent crest, the shape of the wave evolves as the ring particles within the crests collide with one another. Zooming in towards the tiny moon reveals a faint, thin strand of ring material that almost appears to have been directly ripped out of the A-ring by Daphnis. The images of this feature were taken in visible light, using Cassini’s narrow-angle camera at a distance of about 28 000 km from Daphnis. Image scale is 168 m/pixel.
  https://media.mathstodon.xyz/media_attachments/files/114/478/043/236/097/550/original/bc39f9a84bff9dbc.jpg

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