Hemisphere:  Southern  ·  Constellation: Orion (Ori)  ·  Contains:  48 sig Ori  ·  50 zet Ori  ·  Alnitak  ·  B33  ·  Flame Nebula  ·  Horsehead nebula  ·  IC 434  ·  IC 435  ·  IC434  ·  IC435  ·  NGC 2023  ·  NGC 2024  ·  NGC2023  ·  NGC2024  ·  Orion B  ·  Sh2-277  ·  The star Alnitak (ζOri)  ·  The star σOri
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Horsehead -- HaRGB, 


            Richard Beck
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Horsehead -- HaRGB

Imaging telescopes or lenses: Stellarvue SV80ST-25SV 80mm f/6 APO triplet

Imaging cameras: ZWO ASI1600MM Pro

Mounts: Losmandy G11G Gemini 2

Guiding telescopes or lenses: Stellarvue SV80ST-25SV 80mm f/6 APO triplet

Software: KStars Ekos/INDI  ·  PHD2  ·  Pleiades Astrophoto PixInsight

Filters: ZWO Ha 31mm  ·  ZWO Optical ZWO Blue 31mm  ·  ZWO Optical ZWO Red 31mm

Accessory: ZWO OAG  ·  ZWO EAF Focuser  ·  ZWO EFW 8x31mm  ·  DIY EL flat field panel

Dates:Nov. 25, 2020Jan. 2, 2021

ZWO Ha 31mm: 24x300" (gain: 200.00) -15C bin 1x1
ZWO Optical ZWO Blue 31mm: 60x60" (gain: 139.00) -15C bin 1x1
ZWO Optical ZWO Green 31mm: 60x60" (gain: 139.00) -15C bin 1x1
ZWO Optical ZWO Red 31mm: 60x60" (gain: 139.00) -15C bin 1x1

Integration: 5.0 hours

Darks: ~25

Flats: ~25

Flat darks: ~25

Avg. Moon age: 14.22 days

Avg. Moon phase: 83.93%

Astrometry.net job: 4134876

RA center: 5h 40' 27"

DEC center: -2° 26' 7"

Pixel scale: 0.808 arcsec/pixel

Orientation: -92.461 degrees

Field radius: 1.059 degrees

Resolution: 6237x7073

Locations: Home, Montgomery, TX, United States

Data source: Backyard


From Wikipedia:

The Horsehead Nebula (also known as Barnard 33) is a small dark nebula in the constellation Orion. The nebula is located just to the south of Alnitak, the easternmost star of Orion's Belt, and is part of the much larger Orion Molecular Cloud Complex. It appears within the southern region of the dense dust cloud known as Lynds 1630, along the edge of the much larger, active star-forming H II region called IC 434.

The Horsehead Nebula is approximately 422 parsecs or 1,375 light-years from Earth. It is one of the most identifiable nebulae because of its resemblance to a horse's head.

For this image, I used Ha as luminance and 15% of the red channel.



  • Horsehead -- HaRGB, 


            Richard Beck
  • Final
    Horsehead -- HaRGB, 


            Richard Beck


Description: Revised stretching and other processing. The Flame Nebula colors are improved.

Uploaded: ...

Sky plot

Sky plot


Horsehead -- HaRGB, 


            Richard Beck