<ul><li>Object: Comet <a href="https://en.wikipedia.org/wiki/17P/Holmes" class="extiw" title="w:17P/Holmes">17P/Holmes</a> in the <a href="//commons.wikimedia.org/wiki/Category:Perseus_(constellation)" title="Category:Perseus (constellation)">Perseus constellation</a>. The picture was processed to show the green glow surrounding the coma. The star closest to the nucleus that shows through the coma is HD 23104.</li>
<li>Camera: modified EOS 350D (Baader IR cut filter)</li>
<li>Lens: Nikkor 300mm/f4</li>
<li>Aperture: f/5.6</li>
<li>Exposure: 40 x 1'</li>
<li>Exposure start: 2 November 2007 from 00:33 UTC to 01:30 UTC</li>
<li>Location: Paslières, Puy-de-Dôme, France</li>
<li>Processing: <a rel="nofollow" class="external text" href="http://www.astrosurf.com/buil/iris/iris.htm">Iris</a> (log) and Gimp (curves)</li></ul>
<a href="//commons.wikimedia.org/wiki/User:Gil-Estel" title="User:Gil-Estel">Gil-Estel</a>
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>