Comet ISON dust cloud negative
Taken by Lorenzo Comolli on December 13, 2013 @
Tradate, Italy
Click photo for larger image
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Camera Used: SBIG STL-11000 3 CCD Camera Unavailable
Exposure Time: Unavailable
Aperture: Unavailable
ISO: Unavailable
Date Taken: 2013:12:13 14:55:24
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Details:
Other than any condensed remnant (see previous post), I tried also to search for the dust cloud remnant of comet ISON. According to the latest STEREO images, this cloud can be very faint and large. So I tried to image with a fast telephoto lens, a Pentax 165 mm f/2.8 with a full frame CCD (SBIG STL 11000). I was occluded partially by low altitude trees, so I've cropped the field at about 10x7°. I've calibrated with dark and skyflat made immediately after the images, so that I can have the cleanest background. I needed to fight with the strong gradient due to the incoming morning lights. I've processed to improve the background smoothness.
Unfortunately I cannot see any convinging dust cloud remnant. Only gradient residuals.
13 Dec 2013, 5.44.27 UT (midpoint)
Pentax lens 165 mm f/2.8
SBIG STL 11000 at -35°C
field 9.92° x 7.02°
limiting mag ~14
10x30s tracked on comet motion
B39 obs (Tradate, Italy)
Photographer's website:
http://www.astrosurf.com/comolli/index2.htm
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