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.
Reflection nebula | |
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![]() 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 SAO 19158.[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]
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New General Catalogue 7000 to 7499 | |
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Constellation of Cepheus | |||||||||||||
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Nebulae |
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