The Horsehead Nebula (also known as Barnard 33 in bright nebula IC 434) is a dark nebula in the constellation of Orion.
The nebula is located just below Alnitak, the star furthest left on Orion’s Belt, and is part of the much larger Orion Molecular Cloud Complex. It 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 is similar to that of a horse’s head. The shape was first noticed in 1888 by Williamina Fleming on photographic plate B2312 taken at the Harvard College Observatory.
The red glow originates from hydrogen gas (hydrogen alpha) predominantly behind the nebula, ionized by the nearby bright star Sigma Orionis. The darkness of the Horsehead is caused mostly by thick dust, although the lower part of the Horsehead’s neck casts a shadow to the left. Streams of gas leaving the nebula are funnelled by a strong magnetic field. Bright spots in the Horsehead Nebula’s base are young stars just in the process of forming.
Imaged By Keith Rickard
SBIG ST7-XME CCD camera, 8″ Meade LX200 Schmidt Cassegrain Classic at F3.3, 30 x 2min in red, green and luminance and 10 x 2min in blue
Image by Simon Dawes
Skywatcher MN190, EQ6Pro, Canon 600D (Full Spectrum Mod) CLSCCD Filter
45 minutes Integration, Bexleyheath, England.