NGC 7023
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NGC 7023, also Caldwell 4 or the Iris Nebula, is a bright reflection nebula and Caldwell object in the constellation Cepheus. It shines at magnitude +6.8. Its celestial coordinates are RA 21h01.8m, DEC +68°12'. It is located near the Mira-type variable star T Cephei, and near the bright magnitude +3.23 variable star Beta Cephei (Alphirk).
[edit] References
- Stars and Planets, Jay M. Pasachoff, Peterson Field Guides TM, 2000, ISBN 0-395-93432-X
- Firefly: ATLAS OF THE UNIVERSE, Sir Patrick Moore, Firefly Books Limited, 2003, ISBN 1-55297-819-2
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