The Iris Nebula, also known as NGC 7023 and Caldwell 4, is a bright reflection nebula and Caldwell object in the constellation Cepheus. NGC 7023 is actually the cluster within the nebula, LBN 487, and the nebula is lit by a magnitude +7 star, SAO 19158. It shines at magnitude +6.8.

Distance to Earth: 1,300 light years

Radius: 2.9998 light years

Magnitude: 6.8

Constellation: Cepheus

Apparent dimensions (V): 18' x 18'

Apparent magnitude (V): 6.8