Iris Nebula

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.

Iris Nebula

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
See also: Lists of nebulae

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]