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Contains:  IC 435, NGC 2024, NGC 2023, Horsehead nebula, IC 434, IC 432, The star Alnitak (ζOri), The star σOri
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Horsehead nebula (Barnard 33) in HaRGB, 


Horsehead nebula (Barnard 33) in HaRGB

Horsehead nebula (Barnard 33) in HaRGB

Technical card

Imaging telescope or lens:Takahashi FSQ85

Imaging camera:QSI683wsg

Mount:Orion Atlas EQ-G + EQDIR

Guiding telescope or lens:Takahashi FSQ85

Guiding camera:Lodestar

Software:Startools 1.3.5

Filter:Astrodon 5nm Halpha

Accessory:USB FOCUS USB_focus

Resolution: 1446x1087

Dates:Nov. 11, 2014

Astrodon 5nm Halpha: 35x300" -20C bin 1x1
Astrodon 5nm Halpha: 5x600" -20C bin 1x1

Integration: 3.8 hours

Avg. Moon age: 19.31 days

Avg. Moon phase: 78.40% job: 417745

RA center: 85.113 degrees

DEC center: -2.483 degrees

Orientation: 86.150 degrees

Field radius: 1.244 degrees


The Horsehead Nebula (also known as Barnard 33 in emission nebula IC 434) is a dark nebula in the constellation Orion. The nebula is located just to the south of the star Alnitak, which is farthest east on Orion's Belt, and is part of the much larger Orion Molecular Cloud Complex. The nebula was first recorded in 1888 by Scottish astronomer Williamina Fleming on photographic plate B2312 taken at the Harvard College Observatory. The Horsehead Nebula is approximately 1500 light years from Earth. It is one of the most identifiable nebulae because of the shape of its swirling cloud of dark dust and gases, which bears some resemblance to a horse's head when viewed from Earth.

The dark cloud of dust and gas is a region in the Orion Molecular Cloud Complex where star formation is taking place. This stellar nursery, as it is known, can contain over 100 known organic and inorganic gases as well as dust consisting of large and complex organic molecules.

The red or pinkish glow originates from hydrogen gas predominantly behind the nebula, ionized by the nearby bright star Sigma Orionis. Magnetic fields channel the gases leaving the nebula into streams, shown as streaks in the background glow.[3] A glowing strip of hydrogen gas marks the edge of the massive cloud and the densities of stars are noticeably different on either side.


Ha Imaged from Weston, South Florida.
RGB from Kissimmee Prairie State Park, Florida.

Ver 1 - Ha processed version
Ver 2 - Ha + RGB.



License: Attribution Creative Commons


  • Horsehead nebula (Barnard 33) in HaRGB, 


  • Final
    Horsehead nebula (Barnard 33) in HaRGB, 



Sky plot

Sky plot


Horsehead nebula (Barnard 33) in HaRGB,