• Source: Iris Nebula

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. 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.




Notes






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



"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 WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

Kata Kunci Pencarian:

• Nebula Irisan Lemon
• Cepheus
• Asteroid
• Planet
• Uranus
• Saturnus
• Ledakan Dahsyat
• Jupiter
• Daftar istilah astronomi
• Neptunus
• Iris Nebula
• Iris
• List of diffuse nebulae
• C4
• Caldwell catalogue
• John Russell Hind
• Collinder catalogue
• OpenNebula
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• Astrophotography