Simeis 147 (SH2-240) Supernova Remnant

Simeis 147 is a supernova remnant with an apparent age of about 100,000 years. It covers nearly 3 degrees on the sky toward the direction of Taurus constellation with a typical filamentary structure. This very faint object was discovered in 1952 at the Crimean Astrophysical Observatory by using a 25-inch Schmidt camera. Because the extremely low superficial brightness, the object is hard to photograph.