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Contains:  Great Nebula in Orion, M 42, M 43, NGC 1973, NGC 1975, NGC 1976, NGC 1977, NGC 1980, NGC 1982, The star 42Ori, The star 45Ori, The star θ1Ori, The star θ2Ori, The star ιOri
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Learning Curve: M42 above Bortle Class 9 Sky, 


            Min Xie

Learning Curve: M42 above Bortle Class 9 Sky

Technical card

Dates:Jan. 13, 2018

Frames:Optolong L-Pro 77mm: 33x120" ISO200 0C

Integration: 1.1 hours

Darks: ~20

Flats: ~20

Bias: ~20

Avg. Moon age: 26.32 days

Avg. Moon phase: 11.22%

Bortle Dark-Sky Scale: 9.00

Mean SQM: 18.00

Temperature: 3.00

Basic astrometry details job: 3250143

RA center: 5h 36' 1"

DEC center: -5° 30' 14"

Pixel scale: 5.526 arcsec/pixel

Orientation: 0.261 degrees

Field radius: 1.749 degrees

Resolution: 1280x892

Locations: Backyard, Coppell, Texas, United States

Data source: Backyard


Testing out the tracking ability of SkyWatcher Star Adventurer and the Optolong L-Pro 77mm filter in the backyard last night. It was cold. Humidity about 40%. Tried to shoot more lights but the clouds moved in. Overall I like what it came out.

Overall I am happy! Single shot color DSLR with only a DSLR lens. Two of my neighbors' backyard lights are on and above my fence. But they didn't impact the SNR that much. Next target is M31 from the backyard!

First time using Astro Pixel Processor as the pre-processing tool. Simple & straightforward, very impressive.



Min Xie
License: None (All rights reserved)

Sky plot

Sky plot


Learning Curve: M42 above Bortle Class 9 Sky, 


            Min Xie