| Iris Nebula | |
| Type: | Reflection |
| Epoch: | J2000.0 |
| Ra: | 21h 01m 35.60s |
| Dec: | +68° 10 10.0 |
| Dist Ly: | 1,300 |
| Appmag V: | 6.8 |
| Size V: | 18' x 18' |
| Constellation: | Cepheus |
| Radius Ly: | 3 |
| Names: | NGC 7023 and LBN487, Caldwell 4, Cr 429 |
The Iris Nebula (also known as NGC 7023 and Caldwell 4) is a bright reflection nebula in the constellation Cepheus. The designation NGC 7023 refers to the open cluster within the larger reflection nebula designated LBN 487.
The nebula, which shines at magnitude +6.8, is illuminated by a magnitude +7.4 star designated HD 200775.[1] It is located near the Mira-type variable star T Cephei, and near the bright magnitude +3.23 variable star Beta Cephei (Alfirk). It lies 1,300 light-years away and is six light-years across.[2]