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Ison C/2012 S1

Object : Comet, Ison C/2012 S1
Coordinates/Direction : -
Object size : -
Object magnitude : -
More to know : You can read more about the comet on Seiichi Yoshida's homepage: comet/ catalog/ 2012S1/ 2012S1.html

Ison C/2012 S1
Date : 2013-10-19
Time (UT) : 03:38 to 03:51
Mount : Skywatcher EQ6 Pro Synscan
Lens/telescope : Pentax 500mm f/4.5 (f/5.6)
Field (FOV) : 4.1x2.7 degree, before cropping
Filter : none
Camera : Canon EOS 5D
Exp. time : 18x30 seconds at ISO1000
Image process tool : Fitswork, IrfanView.
Processing : align rgb, dark, bias, median stack.
Site : Sweden, Stockholm, Hagsätra. Bortle class 9
Comment : Expectation about this comet was big, very bright and big, it failed. Almost invisible, it's the green dot left and up from center. The bright object lower right is the planet Mars.

Ison C/2012 S1
Comment : This is a crop around the comet. Even if it's weak you can clearly see the tail. The comet has this night magnitude 10, a couple of weeks later it peaked at magnitude -4 which is stronger than Hale Bopp. But I had clouds on the sky these days.

Ison C/2012 S1
Exp. time : 38x30 seconds at ISO1000
Image process tool : Siril, Gimp, IrfanView.
Comment : With all 38 images I had and aligned on the stars it look like this. This is a 800x800 1:1 crop around the comet. Siril which I used to stack couldn't handle comet stacking when it,s weak like this comet. In this case AstroImageJ was better.
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