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Contains:  41 the01 Ori, 42 c Ori, 43 the02 Ori, 44 iot Ori, 45 Ori, De Mairan's nebula, Great Nebula in Orion, Hatysa, M 42, M 43, M43, NGC 1973, NGC 1975, NGC 1976, NGC 1977, NGC 1980, NGC 1981, NGC 1982, NGC1973, NGC1975, NGC1977, NGC1980, NGC1981, Sh2-279, Sh2-281, The star 42Ori, The star 45Ori, The star θ1Ori, The star θ2Ori, The star ιOri
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M42 Great Orion Nebula - QHY268C First Light, 


            Jarrett Trezzo
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M42 Great Orion Nebula - QHY268C First Light

Imaging telescopes or lenses: Celestron 11" Rowe-Ackermann Schmidt Astrograph

Imaging cameras: QHYCCD QHY268C

Mounts: Orion Atlas Pro AZ/EQ-G

Guiding telescopes or lenses: Astromania 60mm Guide Scope

Guiding cameras: QHYCCD QHY5III178M

Software: Adobe Lightroom Classic  ·  PixInsight 1.8.5  ·  Adobe Photoshop CC‎  ·  SynScan Pro  ·  Astro Pixel Processor  ·  Metaguide 5.2.6  ·  Sequence Generator Pro

Filters: Astronomik L2 UV/IR Cut

Accessory: Celestron Focus Motor  ·  Berlebach Planet Tripod  ·  Baader Planetarium UFC  ·  Spike-a Flat Fielder  ·  QHYCCD PoleMaster

Dates:Dec. 26, 2019Dec. 27, 2019

54x60" (gain: 0.00)

Integration: 1.1 hours

Avg. Moon age: 0.78 days

Avg. Moon phase: 0.95%

Bortle Dark-Sky Scale: 5.00

Mean SQM: 19.69 job: 3146719

RA center: 5h 34' 56"

DEC center: -5° 15' 6"

Pixel scale: 1.251 arcsec/pixel

Orientation: -88.866 degrees

Field radius: 1.232 degrees

Resolution: 6020x3740

Locations: Backyard, Parrish, FL, United States

Data source: Backyard


This is another first light image (technically second) with the new APS-C color camera from QHY. I was ruined by clouds before I could get more data, but I don't think it mattered much.

I attempted to compare two of the read modes to see if there was any difference but I couldn't discern any that couldn't be attributed to changing seeing condition or being higher altitude in the sky. This is a combination with part of the frames in High Gain mode (30 of them at gain 0/low conversion gain mode), and Photographic Mode (36 of them, also gain 0).



Jarrett Trezzo
License: None (All rights reserved)


  • M42 Great Orion Nebula - QHY268C First Light, 


            Jarrett Trezzo
  • Final
    M42 Great Orion Nebula - QHY268C First Light, 


            Jarrett Trezzo


Description: increased contrast slightly

Sky plot

Sky plot


M42 Great Orion Nebula - QHY268C First Light, 


            Jarrett Trezzo