ATIK Cameras TITAN Quick Start Manual page 2

From Wikipedia: "The Orion Nebula (also known as
Messier 42, M42, or NGC 1976) is a diffuse nebula
situated south of Orion's Belt. It is one of the brightest
nebulae, and is visible to the naked eye in the night sky.
M42 is located at a distance of 1,344±20 light years
and is the closest region of massive star formation to
Earth. The M42 nebula is estimated to be 24 light years
across."
Image by Rui Tripa (Atik 4000)