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Comet
41P Tuttle-Giacobini-Kresak 2017


41P Tuttle-Giacobini-Kresak (click on the image to get a full resolution photo in a new window)
Object : Comet 41P Tuttle-Giacobini-Kresak 2017
Date : 2017-03-22
Time (UT) : 20:07 to 20:33
Mount : Skywatcher Star Adventures
Lens/telescope : Sigma APO 150mm f/2.8 (f 4.0)
Filter : none
Camera : Canon EOS 6D
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. 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.
More to know : You can read more about the comet on Seiichi Yoshida's homepage:
http://www.aerith.net/ comet/catalog/0041P/2017.html

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