B33 Horsehead Nebula

About image
The Horsehead Nebula (also known as Barnard 33 or B33) is a dark nebula in the Orion constellation: it is located just below Alnitak, the easternmost star of the Orion belt. The darkness of the nebula is mainly caused by dense dust and stands out even more thanks to the background of gas it is projected onto.
Although it is very evident in photography, it is not so evident in visual observation: to see it you need very dark skies and telescopes of good diameter, possibly accompanied by a nebular filter.

Technical data
Optic          Tecnosky Apo Triplet 115 - 800mm f/7
Mount        Losmandy G11 with FS2
Camera         Atik 4000 with Starlight Xpress filter wheel 5 positions
Filters         Baader Ha 7nm unmounted
Guiding system    Apo Skywatcher ED80 with Lodestar
Exposure details  16x900", bin1 -20C
Total integration  4h
Acquisition      Maxim DL, PHD
Processing      Maxim DL, Photoshop CS5
SQM-L       18.60    
Location      Home terrace (Rescaldina, Italy)
Date          9 February 2013

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