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Comet
41P Tuttle-Giacobini-Kresak 2017


Object : Comet, 41P Tuttle-Giacobini-Kresak 2017
Coordinates/Direction : -
Object size : -
Object magnitude : -
More to know : You can read more about the comet on Seiichi Yoshida's homepage:
http://www.aerith.net/ comet/ catalog/ 0041P/ 2017.html

41P Tuttle-Giacobini-Kresak (click on the image to get a full resolution photo in a new window)
Date : 2017-03-22
Time (UT) : 20:07 to 20:33
Mount : SkyWatcher Star Adventurer, light weight mount
Lens/telescope : Sigma APO 150 mm f/2.8 (set to f/4)
Corrector/Barlow : -
Field (FOV) : 13.6x9.1o (full frame) before crop
camera : Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature: About 8 degree Celsius above surrounding temperature
Film/CCD : Raw, Cr2
Filter : none
Control system : Camera focus by Canon Remote APP, camera exposure by intervallometer
Exp. time : 41x30 seconds at ISO12800, this was a mistake in the dark, it should have been 800 or 1600.
Image process tool : AstroImageJ with my own macros, Fitswork, IrfanView.
Processing : demosaic, align rgb, no dark or bias, use dithering instead, median stack.
Site : Sweden, Stockholm, Tyresta national park. Bortle class 4. To be in a big city this place is dark.
Comment : I love to shot with this Sigma 150mm lens, it gives a field of 9x13 degrees. And I can also use the full size off my full frame sensor which I can't with my telescope. With this lens and with my lightweight mount I can go to dark places. When I took this photo the comet was in the constellation Big Bear.

41P Tuttle-Giacobini-Kresak
Comment : This is a crop around the comet. You can see the galaxy M108 just above and to the right is the planetary nebula M97, also called the Owl Nebula.
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