B 33

Click photo to see a slightly larger image.
Description:    This popular, dark nebula, known as 'The Horse Head Nebula', has reached iconic status. It was first detected photographically in 1889 at the Harvard College Observatory. Its Barnard catalogue designation is B 33, and it is mainly composed of dust and compressed, nonluminous gas. It is 3 light years in height.
   The bright nebula background, IC434, is lit by the star Sigma Orionis (off frame to the top). The 'streamers' visible in IC434 are due to material flowing in a strong magnetic field.
Constellation: Orion
Distance: 1500 light years
Apparent Size: 6' x 4'
Date: 6, 13, 18, & 19 december 2005
Equipment: 12"RC @ f/9, ST10XME, AP1200
Exposure: 6 hours Ha (6nm Astrodon)