Iris Nebula

Iris Nebula
Reflection nebula
Iris Nebula (NGC 7023 and LBN487)
Observation data: J2000.0 epoch
Right ascension	21^h 01^m 35.60^s
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

Designations	NGC 7023 and LBN487, Caldwell 4

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

Wikimedia Commons has media related to NGC 7023.

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

Map showing location of NGC 7023 (Roberto Mura)

Coordinates: 21^h 01^m 36^s, +68° 09′ 48″

Astronomical catalogs

NGC	NGC 7018 NGC 7019 NGC 7020 NGC 7021 NGC 7022 NGC 7023 NGC 7024 NGC 7025 NGC 7026 NGC 7027 NGC 7028

Caldwell	C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13

Caldwell catalogue

List	C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 C64 C65 C66 C67 C68 C69 C70 C71 C72 C73 C74 C75 C76 C77 C78 C79 C80 C81 C82 C83 C84 C85 C86 C87 C88 C89 C90 C91 C92 C93 C94 C95 C96 C97 C98 C99 C100 C101 C102 C103 C104 C105 C106 C107 C108 C109

See also	Messier Catalogue Catalogue of Nebulae and Clusters of Stars New General Catalogue Index Catalogue Revised New General Catalogue Herschel 400 Catalogue

Book:Caldwell catalogue Category:Caldwell objects Portal:Astronomy Commons:Caldwell objects

New General Catalogue 7000 to 7499

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Astronomical catalog List of NGC objects

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