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Contains:  M 1, Crab nebula, NGC 1952
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M1– The Crab Nebula, 


            Shannon Calvert
M1– The Crab Nebula

M1– The Crab Nebula

Technical card

Imaging telescope or lens:Astro-Tech AT115EDT

Imaging camera:Canon 7D Mark II mod

Mount:Celestron CGEM II

Guiding telescope or lens:Astro-Tech 60mm Guide Scope

Guiding camera:ZWO ASI 120 MM-S


Resolution: 2400x1600

Dates:Jan. 3, 2019

Frames: 75x120" ISO800

Integration: 2.5 hours

Darks: ~11

Bias: ~80

Avg. Moon age: 27.16 days

Avg. Moon phase: 6.20%

Bortle Dark-Sky Scale: 6.00 job: 2460516

RA center: 83.643 degrees

DEC center: 22.033 degrees

Pixel scale: 1.058 arcsec/pixel

Orientation: 249.016 degrees

Field radius: 0.424 degrees

Locations: The Westport Observatory (WAS), Westport, CT, United States

Data source: Traveller


This was a tough night battling equipment issues and periods of complete overcast conditions, but I hung in there and caught a crab. This image has a little luminance data added from an earlier session with a 16" SCT for detail, however I forgot to take flats.



Shannon Calvert
License: None (All rights reserved)

Sky plot

Sky plot


M1– The Crab Nebula, 


            Shannon Calvert