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Contains:  Horsehead nebula, IC 434, NGC 2023, The star σOri
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Horsehead Nebula (B33) and NGC 2023, 


            Chris Howard
Horsehead Nebula (B33) and NGC 2023
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Horsehead Nebula (B33) and NGC 2023

Technical card

Dates:Jan. 13, 2018

Astonomik 1.25" Ha 12nm: 10x600" -10C bin 1x1
Baader LRGB 2": 10x240" -10C bin 2x2

Integration: 2.3 hours

Darks: ~11

Avg. Moon age: 26.32 days

Avg. Moon phase: 11.22%

Bortle Dark-Sky Scale: 5.00

Temperature: -5.00

Basic astrometry details job: 2721797

RA center: 5h 40' 35"

DEC center: -2° 49' 15"

Pixel scale: 3.958 arcsec/pixel

Orientation: 91.177 degrees

Field radius: 0.822 degrees

Resolution: 1200x891

Data source: Backyard


January 13, 2018 - It's winter and that's when Orion is arguably the main attraction in northern hemisphere skies. HaRGB of the Horsehead Nebula (Barnard 33) along with the reflection nebula NGC 2023 (below and left), part of a whole neighborhood of nebulosity around the leftmost star in Orion's Belt, the blue supergiant Alnitak. (I kept Alnitak out of frame, but it would off to the left with a wider field of view). The Horsehead is an absorption (or dark nebula) about 1500 lightyears from Earth, and shows up so prominently because it's blocking most of the starlight behind it. (10 x 600 second Ha frames, 10 x 240 second RGB frames, 24 dark cal frames taken with an Atik414Ex mono CCD, William Optics GT-81 + 0.8x Field Flattener/Reducer f/4.7, iOptron CEM25P EQ mount, Astronomik 12nm Ha filter, Baader RGB filters, WO 50mm guide scope with ZWO ASI120S-MM guide cam, INDI/KStars/Ekos observatory control)



Chris Howard
License: None (All rights reserved)


  • Final
    Horsehead Nebula (B33) and NGC 2023, 


            Chris Howard

Sky plot

Sky plot


Horsehead Nebula (B33) and NGC 2023, 


            Chris Howard