17P的彗尾？
两张来自www.spaceweather.com的照片。好像能看到一点彗尾？
拍摄说明：
Sean Walker,
Chester, New Hampshire
Oct. 28, 2007
I just can't resist a bright comet, even during the brightest phases of the Moon- I decided to take many short exposures to try to detect any hint of an Ion tail, rather than concentrating my efforts on the bright pseudo-nucleus. Success! Note the faint, diffuse tail trailing off to the upper-left in this image. 108mm f/4 astrograph, SBIG ST-10XE CCD Camera. 21 minutes of red, green, and blue filtered exposures each.
http://www.spaceweather.com/comets/holmes/29oct07/Sean-Walker1.jpg
另外一张：
拍摄说明：
Pete Lawrence,
Selsey, West Sussex, UK
Oct. 29, 2007
This is a 45 minute exposure (9x5 minute exposures) extreme processed to reveal the tail of comet 17P/Holmes. It's extremely faint but is there heading off to the upper right of the coma in this image. As the Moon moves out of the way this should give astrophotographers a better opportunity to focus on the faint structures that constitute that most important piece of a comet - its tail.
http://www.spaceweather.com/comets/holmes/29oct07/Pete-Lawrence1.jpg 现在效果这么强了?都能看到那么绿了::070821_01.jpg:: ::070821_01.jpg:: 最近都在加班，深圳的天气也不怎么好，器材又不在身边，这个彗星还没有拍过呢::070821_20.jpg::
希望有条件的同好长时间曝光试试能不能也拍出彗尾::070821_21.jpg:: 第二张有一点点感觉::070821_01.jpg:: 前几天由于月光的干扰，不可能曝光长时间，很难拍到彗尾。
现在在高纬度比较有优势，在月亮出来之前，彗星已经很高了，可以曝光更长时间，这样彗尾就有可能出来。
低纬度的还要迟几天才有机会。 2张图作反色处理
这张是黑白的，直接反色
这张是彩色的，直接反色
原彩图去色再反色
是扇形彗尾啦！::070821_01.jpg::
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