Iris Nebula
Coordinates: 
21h 01m 36s, +68° 09′ 48″
21h 01m 36s, +68° 09′ 48″' x 18' | |
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| 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.
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]
Notes
- ^ Perkins, Philip (2005). "NGC 7023". astrocruise.com. Archived from the original on 2008-05-18. Retrieved 2008-08-06.
- ^ Nemiroff, R.; Bonnell, J., eds. (2004-11-04). "NGC 7023: The Iris Nebula". Astronomy Picture of the Day. NASA. Retrieved 2008-08-06.
References
- Pasachoff, Jay M. (2000). "Atlas of the Sky". Stars and Planets. New York, New York: Peterson Field Guides. pp. 578 pg. ISBN 978-0-395-93432-6.
- Caldwell-Moore, Sir Patrick (2003). Firefly Atlas of the Universe. Firefly Books Limited. ISBN 978-1-55297-819-1.
External links
Wikimedia Commons has media related to NGC 7023.
- "NGC 7023". SIMBAD. Centre de données astronomiques de Strasbourg.
- SEDS – NGC 7023
- VizieR – NGC 7023
- NED – NGC 7023
- Dark Atmospheres Photography – Iris Nebula NGC 7023
- See NGC 7023 in WorldWide Telescope
- Iris Nebula on
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