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4 members, 31 messages added in the last 7 days
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  • C/2015 C2 (SWAN) discovery details

    Hi All, Thought I’d share a few discovery details on C/2015 C2 (SWAN). I first spotted the comet in SWAN imagery on Sunday, Feb. 22nd, when composite images

    rdotdaneelolivaw 1 day ago
  • Re: 2015 D1 50' tail no cc

    Yes, that's the joy of comet observing Denis! The point I was trying to make is that while comets like C/2010 X1 and C/2015 D1 have disintegrated and have (or

    kaufman_rob 3 days ago
  • Re: 2015 D1 50' tail no cc

    Hi Rob, Perhaps the difference in the dissipation of material in the comet remnant is due to the original size of the comet, and then after disruption,  the

    dennis555002 3 days ago
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Group Description

This group is for observers and anyone else interested in comets. This includes discussion about visual, photographic and CCD observing as well as about astrometric, orbital, photometric, hunting or historical aspects. Observations have to be posted at our parallel list CometObs, images at our parallel list Comet-Images.



There is a special repository for important contributions which contains special guidelines and most helpful list contributions for comet observers which can be found at



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