The Horsehead Nebula (Barnard 33) is a dark nebula located near the star Alnitak which is the easternmost star in the belt of Orion. The constellation Orion is very prominent in he winter evening sky.

The nebula lies at approximately 1.500 light years from Earth, and is approximately 3.5 light years wide. A lot of star formation is taking place in this region. The red glow comes from hydrogen gas mostly behind the nebula which is ionized by the bright star Sigma Orionis.

The darkness of the Horsehead is caused mostly by thick dust.
Bright spots in the Horsehead Nebula’s base are young stars which are in the process of forming.

Previous/older images:

Dec 28, 2008 – Canon 350D (80mm TMB-6h 25m)

Image data

Object info
Name B33 in IC434 – The Horsehead Nebula
Type Dark nebula/Emission nebula
Constellation Orion
Right ascension 05h 40m 59s
Declination -02° 27′ 30″
Distance 1.500 ly
Other designations Barnard 33, IC434, LDN1630
Image info
Image date Nov. 30, 2016
Light frames 14x 5 min. RGB (each) unbinned, 28x 10 min. 7nm Ha unbinned (Luminance)
Total integration 8h 10m
Dark frames 20x
Flat frames 20x p. filter unbinned, created with an A3 size Posterpoweruk flatfield panel
Bias frames 20x
Software used SGPro, PHD2 Guiding, DeepSkyStacker, Registar, Photoshop CS6
Processing Focusing and image acquisition was done using Sequence Generator Pro.
All separate frames were calibrated, aligned and stacked in DeepSkyStacker.
Images were aligned in Registar prior to combining into RGB.
Photoshop CS6 was used for further processing – curves adjustment, levels adjustment, etc.
Noel Carboni’s toolset was used as well (Local Contrast Enhancement, Deep Space Noise Reduction)
Equipment info
Telescope TMB/LOMO 80/480
Corrector Televue 2″ TRF 2008 flattener/reducer (FL: 384mm f/4.8)
Mount Losmandy G-11 Gemini
Camera SBIG ST-8300M
Guide camera Astrolumina ALccd5-II (Mono)
Guide scope Starwave 50mm f/4.1 Guide Scope
Autoguide software PHD2 Guiding
Filters Baader 2″ 7nm Ha, Baader 2″ RGB + IDAS LPS-P2
Location Landgraaf, The Netherlands
Image comments

Imaging conditions not very good. High humidity.

The images were taken over 2 nights