The Butterfly Nebula is located in the constellation Cygnus and is mainly an emission nebula. However, there is also a smaller dark nebula (LDN 889) directly in the centre of this red nebula. The emission nebula has the catalogue designation IC1318 and is sometimes called the Gamma Cygni Nebula. Gamma Cygni is the bright star directly in the centre of the image. Gamma Cygni or Sadr is a special F8 type star. It is special because unlike most other supergiant stars it is neither cold and red nor blue and hot. It is much more yellow and about as hot as our sun. Sadr is about 1,800 light years away from our solar system. The nebula itself is estimated to be between 2,000 and 5,000 light years from Earth.

Source: stars.astro / NASA

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