Iris Nebula

Common card · No. 398892

The Iris Nebula (also known as NGC 7023 or Caldwell 4) is a bright reflection nebula located about 1,300 light years from Earth in the constellation of Cepheus. The nebula is illuminated by a magnitude +7.4 star designated HD 200775. It is six light-years across. The nebula was discovered in 1794 by Sir William Herschel, an astronomer, where it was then added to the New General Catalogue (NGC). The nebula is a member of the Cepheus Flare. It is located near the Mira-type variable star T Cephei, and near the bright magnitude +3.23 variable star Beta Cephei (Alfirk). The designation NGC 7023 refers to the open cluster within the larger reflection nebula designated LBN 487.

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