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IC 1831 Heart Nebula

Object : IC 1831 Heart Nebula
Coordinates/Direction : RA: 02h32m, DEC: +61o23'
Object size : 180'
Object magnitude : 4
More to know : Simbad: simbad/ sim-id?Ident= IC+1831

IC 1831 Nebula 2022-11-12

IC 1831 Nebula, 2022 (Click on the image and get a full resolution image in a new window)
Date : 2021-11-02
Time (UT) : 17:56 to 18:37
Mount : SkyWatcher HEQ5, belt modified, low rider
Guide : QHY5 camera with 200 mm f/3.5 lens
Lens/telescope : Pentax 645 300 mm ED f/4 (medium format lens)
Corrector/Barlow : -
Field (FOV) : 6.8x4.5o (full frame) before crop
camera : Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature: About 6o C above surrounding temperature
Film/CCD : Raw, Cr2
Filter : none
Control system: Mount, camera, focus, guide (Ekos) controlled by Astroberry (KStars/Ekos Linux)
Exp. time : 13x120 seconds, iso1600, dithering mode
Image process tool : Siril, Fitswork, Irfanview
Processing : crop, resize, level, cal dark, bias, flat
Weather : clear
Site : Sweden, Stockholm, Ingarö. Bortle 4
Comment : Now when at the dark place at Ingarö I must try to catch some nebulas. This is the Heart Nebula. It's not easy to recognize it in the strong full Moon light. I give it a new try later when not full Moon and give it much longer exposure. I had to throw away half of the photos because of clouds coming into the field.

The flat calibration master is far from perfect, as a result the center got a dark spot which shouldn't be there. It's very difficult to take high quality flat frames, this is done against the evening sky before the stars appear.
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