The “Horsehead Nebula” is a small dark nebula in the constellation Orion. The nebula is located just to the south of Alnitak (zeta Orionis), the easternmost star of Orion's Belt, and is part of the much larger Orion Molecular Cloud Complex. The Horsehead Nebula is approximately 1.400 light-years from Earth. It is one of the most identifiable nebulae because of its resemblance to a horse's head.
Near bright star zeta Orionis, the horsehead nebula (right) and flame nebula (NGC 2024, left). Some image “processing”, as exposure (181 s) was too short. 3. Feb 2014, Noordwijk, William Optics 110 mm FLT APO f/7, Canon EOS 600D, UV-IR, UHC, 4oo ISO, 181 sec.
21 January 2017: Cold but good conditions: Time to take pictures of the Horsehead nebula. William Optics 110 FLT APO f/7, Canon EOS 600D (Baader BCF filter), UHC Filter, ISO 800, Lacerta-Mgen autoguider. The improvement compared to earlier photos made in 2014 is, that the autoguider works very nicely now; I am collecting a number of shorter exposures (e.g. 20 x 20 s) compared to single, long (> 100 sec) one; a sufficient number of dark frames --- before, during and after exposure of the target --- and I am gaining more experience with image processing using fitswork (darkframe subtraction, adding frames, batch mode etc.)
Horsehead nebula (Barnard 33), and NGC 2024 (Flame Nebula), 21 January 2017, Noordwijk, William Optics 110 mm APO FLT f/7, Canon EOS 600D, UV-IR, UHC filter, 800 ISO, 400 sec, PixInsight
Horsehead nebula (Barnard 33), and NGC 2024 (Flame Nebula), 17 November 2018, Vorst, William Optics 110 mm APO FLT f/7, Canon EOS 600D, UV-IR, UHC filter, 400 ISO, 3000 sec, top image: fitswork/GIMP, bottom image: PixInsight V1.8.8.-5