Comet Holmes, 17P, taken Nov 1, 2007 on excellent night. Taken with A&M 105mm apo refractor at f/5 with Borg 0.85x compressor/field flattener on SkyWatcher HEQ5 mount. Canon 20Da camera at ISO400. Composite of 4 min, 2min, 1min, 30sec, 15sec, and 7 sec exposures, each exposure being a stack of 3 to 4 identical exposures. Registered and stacked in Photoshop (HDR mode did not produce usable result, so manually composited with sucessively smaller masks to reveal short exposure content around nucleus. Contrast exaggerated with Curves to bring out very faint tail structure. North up, so tail to the S and SW.Nucleus is dot at upper left of inner coma, other star in inner coma at right is a field star
Comet Holmes 17/P, taken Oct 30, 2007, with 135mm telephoto lens at f/2.8 and Canon 20Da camera at ISO800 and stack of 2 x 3 minute exposures. Below Perseus OB Association and Mirfak.Shows faint tail to the right.
Comet Holmes, taken Oct 30, 2007, with 106mm A&M refractor at f/5, with Canon 20Da at ISO800. Stack of 2 x 48s exposures and stack of 4 x 6s exposures, composited together to preserve nucleus area. Skywatcher HEQ5 mount used, no guiding. Rough polar alignment. Would have stacked more images but layers did not register due to focus shift? Image size seemed to change.
