Iris Nebula

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
v · d · e

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

1. ^ Perkins, Philip (2005). "NGC 7023". astrocruise.com. http://www.astrocruise.com/milky_way/N7023_05.htm. Retrieved 2008-08-06. 
2. ^ Nemiroff, Robert; Bonnell, Jerry (2004-11-04). "APOD: 2004 November 4 - NGC 7023: The Iris Nebula". APOD (NASA). http://apod.nasa.gov/apod/ap041104.html. 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: 21^h 01^m 36^s, +68° 09′ 48″