“Iris Nebula”的意思、由来-开放百科全书

词条

Iris Nebula

释义

Notes
References
External links

{{Infobox nebula
| name = Iris Nebula
| image = Iris1HunterWilson.jpg
| caption= Iris Nebula (NGC 7023 and LBN487)
| type = Reflection
| epoch = J2000.0
| ra = 21^h 01^m 35.60^s
| dec = +68° 10′ 10.0"
| dist_ly = 1,300
| appmag_v = 6.8
| size_v = 18' x 18'
| constellation = Cepheus
| radius_ly = 3
| absmag_v =
| notes =
| names = NGC 7023 and LBN487, Caldwell 4
}}

The Iris Nebula, also known as 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. ^{{cite web|url=http://www.astrocruise.com/milky_way/N7023_05.htm|title=NGC 7023|last=Perkins|first=Philip|date=2005|publisher=astrocruise.com|accessdate=2008-08-06}}
2. ^{{Cite APOD|title=NGC 7023: The Iris Nebula|date=2004-11-04|access-date=2008-08-06}}

References

{{cite book|last=Pasachoff|first=Jay M.|title=Stars and Planets|publisher=Peterson Field Guides|location=New York, New York|date=2000|pages=578 pg|chapter=Atlas of the Sky|isbn=978-0-395-93432-6}}
{{cite book|last=Caldwell-Moore|first=Sir Patrick|title=Firefly Atlas of the Universe|publisher=Firefly Books Limited|date=2003|isbn=978-1-55297-819-1}}

External links

{{cite simbad|title=NGC 7023}}
[https://web.archive.org/web/20081202010429/http://www.seds.org/~spider/ngc/ngc.cgi?7023 SEDS – NGC 7023]
VizieR – NGC 7023
NED – NGC 7023
Dark Atmospheres Photography – Iris Nebula NGC 7023
See NGC 7023 in WorldWide Telescope
{{WikiSky}}

5 : NGC objects|Caldwell objects|Cepheus (constellation)|Reflection nebulae|Diffuse nebulae

随便看

开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。