Hemisphere:  Northern  ·  Constellation: Orion (Ori)  ·  Contains:  Flame Nebula  ·  Great Orion Nebula  ·  IC 434  ·  M 42  ·  NGC 1909  ·  NGC 1976  ·  NGC 2024  ·  Orion B  ·  Orion Nebula  ·  Part of the constellation Eridanus (Eri)  ·  Part of the constellation Lepus (Lep)  ·  Part of the constellation Orion (Ori)  ·  The star Alnilam (εOri)  ·  The star Alnitak (ζOri)  ·  The star Bellatrix (γOri)  ·  The star Betelgeuse (αOri)  ·  The star Cursa (βEri)  ·  The star Mintaka (δOri)  ·  The star Rigel (βOri)  ·  The star Saiph (κOri)  ·  The star ηOri  ·  The star ιOri  ·  the Witch Head Nebula
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SH2 276 - Barnard's Loop and SH2 264 - Angelfish Nebula, in Orion, 


            Doug Gray
SH2 276 - Barnard's Loop and SH2 264 - Angelfish Nebula, in Orion
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SH2 276 - Barnard's Loop and SH2 264 - Angelfish Nebula, in Orion

Technical card

Imaging telescopes or lenses: Nikon 35mm f1.8

Imaging cameras: ZWO ASI294MM-Pro

Mounts: iOptron CEM70  ·  iOptron Tri-Pier

Guiding telescopes or lenses: ZWO 30mm f/4 Mini Guide Scope

Guiding cameras: ZWO 290MC

Software: Adobe Photoshop  ·  siril  ·  PHD2 Guiding

Filters: Antlia SII 3.5nm 36mm  ·  Antlia OIII 3.5nm 36mm  ·  Antlia Ha 3.5nm 36mm

Accessory: ZWO ASIAir Pro  ·  ZWO EFW 7x36mm

Dates:Dec. 11, 2020Dec. 13, 2020

Antlia Ha 3.5nm 36mm: 20x300" (gain: 120.00) -10C bin 2x2
Antlia OIII 3.5nm 36mm: 15x300" (gain: 120.00) -10C bin 2x2
Antlia SII 3.5nm 36mm: 15x300" (gain: 120.00) -10C bin 2x2

Integration: 4.2 hours

Darks: ~30

Flats: ~30

Flat darks: ~30

Bias: ~60

Avg. Moon age: 27.06 days

Avg. Moon phase: 7.99%

Basic astrometry details

Astrometry.net job: 4089840

RA center: 5h 34' 33"

DEC center: +0° 26' 34"

Pixel scale: 26.844 arcsec/pixel

Orientation: 0.350 degrees

Field radius: 16.051 degrees

Resolution: 2382x3586

Data source: Backyard


When I first got a telescope, I wanted to look at all the smallest objects in the sky, but since I got narrowband filters I've become interested in the biggest ones. Barnard's loop is over 10 degrees, and the Lambda Orionis Ring (Angelfish Nebula) is around a third of that. Together, they cover most of the constellation Orion. The Orion, Running Man, Flame, & Horsehead Nebulas are all easily identifiable here as well.

I shot this with a 35mm Nikon lens wide open at f 1/1.8, so there is quite a bit of coma outside the central part of the image. I would have stopped down the aperture, but I've discovered that the only way to control the iris on these Nikon lenses without a DSLR body is by jamming something small under the spring loaded aperture control lever before attaching it to the filter wheel. I'm very much open to suggestions for a more precise way of doing this.

In post-processing, R=Ha, G=S+0.5Ha, B=O. After stretching and gradient removal, I've done some adjustments using the Camera Raw filter in Photoshop. I may come back to do another revision later, as I feel like the stretched Ha image had more detail that did not show up here.


Sky plot

Sky plot


SH2 276 - Barnard's Loop and SH2 264 - Angelfish Nebula, in Orion, 


            Doug Gray