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Contains:  Great Nebula in Orion, M 42, M 43, NGC 1973, NGC 1975, NGC 1976, NGC 1977, NGC 1980, NGC 1981, NGC 1982, The star 42Ori, The star 45Ori, The star θ1Ori, The star θ2Ori, The star ιOri
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M42/M43/NGC 1977, Altair 183M, 60x60s, 


M42/M43/NGC 1977, Altair 183M, 60x60s
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M42/M43/NGC 1977, Altair 183M, 60x60s

Technical card

Dates:Feb. 27, 2019

Frames: 60x60" (gain: 200.00) bin 1x1

Integration: 1.0 hours

Darks: ~33

Flats: ~100

Bias: ~100

Avg. Moon age: 23.09 days

Avg. Moon phase: 40.04%

Bortle Dark-Sky Scale: 7.00

Basic astrometry details job: 2558920

RA center: 5h 35' 19"

DEC center: -5° 22' 26"

Pixel scale: 1.555 arcsec/pixel

Orientation: 283.053 degrees

Field radius: 1.400 degrees

Resolution: 5384x3612

Data source: Backyard


This image was captured in the car park of the local village hall at an Astro club meeting. Nebulosity was targeted at the expense of star saturation.

Equipment: Altair 66ED refractor, 0.8x reducer/flattener, Altair 183M camera, Celestron CG5 mount.
Software: SharpCap 3.2, FITS Liberator, SiriL 0.9.10, Gimp 2.10.
Capture: 60x60s, 33 darks, 100 bias, 100 flats. *Unguided*.

The black level setting of 30 in SharpCap was decided by taking single bias frames and using the minimum black level setting which gave a centralised/balanced histogram in FITS Liberator.

Mount alignment was achieved with polar scope, 2 alignment stars, 4 calibration stars and an All Star Polar Align. Focus was with a Bahtinov Mask.

SiriL: calibrate, register, stack frames, background extraction, apply histogram transformation and export to TIFF.
GIMP: Curves, levels, shadows-highlights, contrast, slight noise reduction.

If I get a chance, I will repeat this capture with 120x 30s exposure to experiment with the star saturation.




License: None (All rights reserved)

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M42/M43/NGC 1977, Altair 183M, 60x60s,