Iris Nebula
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| Iris Nebula | |
|---|---|
 Iris Nebula (NGC 7023 and LBN487) | |
| Observation data: J2000.0 epoch | |
| Type | Reflection |
| 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 |
| Other designations | NGC 7023 and LBN487, Caldwell 4 |
| See also: Diffuse nebula, Lists of nebulae | |
The Iris Nebula, also NGC 7023 and Caldwell 4, is a bright reflection nebula and Caldwell object in the constellation Cepheus. NGC 7023 is actually the cluster within the nebula, LBN 487, and the nebula is lit by a magnitude +7 star, SAO 19158.[1] It shines at magnitude +6.8. It is located near the Mira-type variable star T Cephei, and near the bright magnitude +3.23 variable star Beta Cephei (Alphirk). It lies 1,300 light-years away and is six light-years across.[2]
Notes
- ↑ Perkins, Philip (2005). "NGC 7023". astrocruise.com. Retrieved 2008-08-06.
- ↑ Nemiroff, Robert; Bonnell, Jerry (2004-11-04). "APOD: 2004 November 4 - NGC 7023: The Iris Nebula". APOD (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 0-395-93432-X.
- Caldwell-Moore, Sir Patrick (2003). Firefly Atlas of the Universe. Firefly Books Limited. ISBN 1-55297-819-2.
External links
- SEDS – NGC 7023
- Simbad – NGC 7023
- VizieR – NGC 7023
- NED – NGC 7023
- Dark Atmospheres Photography – Iris Nebula NGC 7023
- See NGC 7023 in WorldWide Telescope
- Iris Nebula on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 
21h 01m 36s, +68° 09′ 48″
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