Hemisphere:  Southern  ·  Contains:  Flame Nebula  ·  Great Orion Nebula  ·  IC 434  ·  M 42  ·  M 43  ·  Mairan's Nebula  ·  NGC 1976  ·  NGC 1982  ·  NGC 2024  ·  NGC 2112  ·  Orion B  ·  Orion Nebula  ·  Part of the constellation Orion (Ori)  ·  The star 29Ori  ·  The star Alnilam (εOri)  ·  The star Alnitak (ζOri)  ·  The star Mintaka (δOri)  ·  The star Rigel (βOri)  ·  The star Saiph (κOri)  ·  The star ηOri  ·  The star ιOri  ·  The star σOri  ·  The star τOri
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The Green Fourth ‘Star’ of Orion’s Belt, 


            Terry Hancock
The Green Fourth ‘Star’ of Orion’s Belt
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The Green Fourth ‘Star’ of Orion’s Belt

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

Technical card

Imaging telescopes or lenses: Rokinon 135mm f/2.0 ED UMC Telephoto Rokinin 135mm

Imaging cameras: qhyccd 367 Pro C

Mounts: software bisque Paramount ME

Guiding cameras: Starlight Xpress Lodestar X2 Lodestar Autoguider X2

Software: PixInsight 1.8  ·  Starnet ++  ·  Adobe Photoshopc CC

Accessory: William Optics G61 Guider

Basic astrometry details

Astrometry.net job: 4006500

RA center: 5h 33' 39"

DEC center: -2° 12' 21"

Pixel scale: 7.747 arcsec/pixel

Orientation: 91.368 degrees

Field radius: 9.369 degrees

Resolution: 7194x4908

Data source: Amateur hosting facility

Remote source: Grand Mesa Observatory


The Green Fourth ‘Star’ of Orion’s Belt
C/2020 M3 (ATLAS) makes for a temporary fourth green ‘star’ in the constellation Orion’s belt in this image comprising of 47 x 2 minute and 29 x 15 second exposures taken from Grand Mesa Observatory on 11/11/2020.

While you’ll need a decent pair of binoculars from a dark location to see Comet C/2020 M3 with your eye, in photographs it shows up quite nicely as it photobombs the constellation Orion. Discovered over this past summer by the ATLAS telescope system, C/2020 M3 is at its closest approach to Earth today, 11/14 at about 33 million miles away.

The data used in this setup “System 2C” is available from Grand Mesa Observatory’s legacy datatbase

Technical Info:
Captured and Processed by Terry Hancock and Tom Masterson
Total Integration time 1.5 hours
Location: GrandMesaObservatory.com Purdy Mesa, Colorado
Date of capture: November 11th 2020
Color RGGB 94 min, 47 x 120 sec
Color RGGB 7.25 min, 29 x 15 sec
Camera: QHY367 Pro C Full Frame Color CMOS
Gain 2850, Offset 76
Calibrated with Dark and Bias Frames
Optics: 135mm F2.0 Rokinon Lens
Image Acquisition software Maxim DL6
Pre Processed in Pixinsight
Post Processed in Photoshop

A nice write up of Comet C/2020 M3 (ATLAS) can be found here: https://earthsky.org/space/comet-c-2020-m3-atlas-closest-to-earth-nov-14-2020



Terry Hancock
License: None (All rights reserved)

Sky plot

Sky plot


The Green Fourth ‘Star’ of Orion’s Belt, 


            Terry Hancock