Comet Holmes was a very unusual comet that appeared in fall of 2007.  While at about the distance of the orbit of Mars, it suddenly burst forth with an eruption and brightened with a dramatically enlarged coma surrounding its already bright nucleus. It was essentially spherical in shape, with no discernible tail. It was visible to the naked eye and a grand sight in binoculars. Image obtained on 11/02/2007 07:39 UT Canon 20D DSLR, 30 sec exposure, ISO 1600.