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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 (Click on image to get one in higher resolution, open in a new window)
Date : 2013-10-19
Time (UT) : 03:38 to 03:51
Mount : SkyWatcher EQ6 Pro, beltdrive modified (DIY 2019)
Lens/telescope : Pentax 500 mm f/4.5 (medium/35mm format lens)
Corrector/Barlow : -
Field (FOV) : 4.1x2.7o (full frame) before crop
camera : Canon 5D Mk I, QE=0.25, full frame, 12 Mpixel, 12 bit
camera temperature: About 3o C above surrounding temperature
Film/CCD : Raw, Cr2
Filter : none
Control system : Mount by EQMOD, camera by APT, ASCOM Windows PC
Exp. time : 18x30 seconds at ISO1000
Image process tool : Fitswork, IrfanView.
Processing : align rgb, dark, bias, median stack.
Site : Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20o-90o, 165o-185o, La: 20o-55o
Comment : Expectation about this comet was big, very bright and big, it failed. This is a crop around the comet. Almost invisible, it's the green dot in center. Even if it's weak you can clearly see the tail. The comet has this night a magnitude of 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. On the full resolution image there is a bright object lower right, this the planet Mars.
Ison C/2012 S1
Date : 2013-10-19
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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