| Reflection nebula | |
|---|---|
 Iris Nebula (NGC 7023 and LBN487) | |
| Observation data: J2000.0 epoch | |
| Right ascension | 21h 01m 35.60s |
| Declination | +68° 10′ 10.0″ |
| Distance | 1,300 ly |
| Apparent magnitude (V) | 6.8 |
| Apparent dimensions (V) | 18' x 18' |
| Constellation | Cepheus |
| Physical characteristics | |
| Radius | 3 ly |
| Designations | 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.
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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]
