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Contains:  M 43, NGC 1982, NGC 1977, NGC 1980, M 42, Great Nebula in Orion, NGC 1976, NGC 1975, NGC 1981, NGC 1973, The star 45Ori, The star ιOri, The star θ2Ori, The star θ1Ori, The star 42Ori
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M42 2018

Technical card

Imaging telescope or lens:Takahashi TOA 150

Imaging camera:Pentax 645z Mod

Mount:Takahashi EM-400 Temma2

Guiding telescopes or lenses:SharpStar 50 EDVixen FL70S

Guiding cameras:ZWO ASI290MM MiniFishcamp Starfish

Focal reducer:Takahashi TOA 67 Flattener

Software:PixInsightAuriga Imaging RegiStarPhotoshop CC

Resolution: 3696x4932

Dates:Feb. 7, 2016Dec. 21, 2017Feb. 17, 2018

40x30" ISO800
24x300" ISO800
31x480" ISO800

Integration: 6.5 hours

Avg. Moon age: 10.90 days

Avg. Moon phase: 4.43%

Bortle Dark-Sky Scale: 2.00 job: 1935053

RA center: 83.771 degrees

DEC center: -5.283 degrees

Pixel scale: 1.658 arcsec/pixel

Orientation: 353.911 degrees

Field radius: 1.419 degrees

Locations: Mt. Ho-Huan (Taiwan), Taichung, Taiwan

Data source: Traveller


My 2017/2018 attempt on M42. The 2016 data (2 hr) were taken under very poor seeing. They are only included to enhance S/N in darker area where there are no sharp features.

Rev.B is a version of less contrast stretching.

Rev.C is a 2x zoom-in of the Trapezium region composed from only the short exposures.



Wei-Hao Wang
License: None (All rights reserved)


Sky plot

Sky plot


M42 2018, 


            Wei-Hao Wang