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Contains:  Great Nebula in Orion, Horsehead nebula, IC 434, M 42, M 43, NGC 1976, NGC 1977, NGC 1980, NGC 1981, NGC 1982, NGC 1990, NGC 1999, NGC 2024, NGC 2064, Part of the constellation Orion (Ori), The star 42Ori, The star Alnilam (εOri), The star Alnitak (ζOri), The star Mintaka (δOri), The star ηOri, The star ιOri, The star σOri, The star τOri, The star υOri
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Orion at 85 mm in H-alpha, 


Orion at 85 mm in H-alpha
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Orion at 85 mm in H-alpha

Technical card

Dates:Jan. 20, 2020Jan. 21, 2020Jan. 25, 2020Jan. 29, 2020Feb. 2, 2020

STC Astro Duo-Narrowband filter (Nikon aps-c clip): 68x240" ISO200
STC Astro Duo-Narrowband filter (Nikon aps-c clip): 51x30" ISO200

Integration: 5.0 hours

Darks: ~40

Flats: ~15

Flat darks: ~15

Bias: ~20

Avg. Moon age: 12.80 days

Avg. Moon phase: 20.95%

Basic astrometry details job: 3231077

RA center: 5h 38' 42"

DEC center: -3° 27' 7"

Pixel scale: 9.363 arcsec/pixel

Orientation: 346.759 degrees

Field radius: 7.701 degrees

Resolution: 4674x3635

Locations: Home, Silver Spring, Maryland, United States

Data source: Backyard


This wide field image of the central region of the Orion constellation was captured on the nights of January 20/21/25/29 and February 2, 2020 using a short telephoto lens and dual narrowband filter. As is the case for many of us, this was one of my first deep sky astrophotography targets and remains a perennial favorite. I captured images at two different exposure durations (30 s and 240 s) to generate HDR images capturing both faint nebulocity and a bit more detail in the core of M42. This is image includes the H-alpha data (red channel).

Imaged with 85mm/F1.4 Rokinon at F/2, STC Duo Narrowband Clip Filter, and full spectrum modified Nikon D5300.

Pre-processed using PixInsight Batch Pre-Processing (BPP) script. Images calibrated using darks, bias, and flats. Extracted red/green/blue channels using BatchChannelExtraction script. R, G, & B channels registered and stacked independently using StarAlighment and Integration. R channel data gives the Ha image. Averaged G & B channels using Pixelmath to generate OIII image.

For the long exposures, total integration time of ~4 hours using 68 subs at ISO200 x 240 sec.
For the long exposures, total integration time of ~1 hour using 51 subs at ISO200 x 30 sec.

R and Average of G+B channels individually post-processed in Pixinsight: Cropped, gradient removal with ABE, HDRComposition (binarizing threshold = 0.6) to combine different exposure lengths, MLT for noise reduction, stretched using masked stretch, Curves Transformation, TGVDenoise for noise reduction, HDR transform, Local histogram transform, morphological transform to shrink stars.



License: None (All rights reserved)

Sky plot

Sky plot


Orion at 85 mm in H-alpha,