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By Davide Simonetti
The Crab Nebula (also known as M1, NGC 1952 or Taurus A). This is quite an improvement on the last attempt at imaging M1 about two years ago. This time it was possible to bring out some of the filaments that make this object so interesting - this despite using a much shorter focal length making the object appear significantly smaller. The image is cropped rather radically to show more details in the nebula so the stars appear bigger than I would prefer, but on the original they look fine.
040 x 300 second exposures at Unity Gain (139) cooled to -20°C
050 x dark frames
040 x flat frames
100 x bias frames
Total integration time = 3 hours and 20 minutes
Captured with APT
Guided with PHD2
Processed in Nebulosity, Fitsworks, and Photoshop
Telescope: Sky-Watcher Explorer-150PDS
Mount: Skywatcher EQ5
Guide Scope: Orion 50mm Mini
Guiding Camera: ZWO ASI120MC
Imaging Camera: ZWO ASI1600MC Pro
Baader Mark-III MPCC Coma Corrector
Light pollution filter
M1 The Crab Nebula 08.12.2017
William Optics FLT-110 and Atik 314L Monochrome CCD
10 x 300 seconds H-Alpha, 10 x 300 seconds OIII, 10 x 300 seconds SII
Stacked in Deep Sky Stacker and processed in Photoshop CS2
False colour image by assigning SII to red channel, H-alpha to green channel and OIII to blue channel
My first attempt at the Crab Nebula (M1). The cropped image is a LRGB with Ha blended into the Lum and Red channels and represents about 14 hours integration. I was quite pleased with the amount of detail revealed.
LIGHTS: L:14,R:16, G:8, B:14 x 600s, H:11 x 1800s. DARKS:30, BIAS:100, FLATS: 40.