NGC 7023

Database links to NGC 7023 (Iris Nebula)

Open star cluster and reflection nebula
NGC 7023 - Iris Nebula
Amateur astronomical image of the Iris Nebula, NGC 7023
Constellation	Cepheus
Position equinox : J2000.0
Right ascension	21h 01m 35.6s
declination	+ 68 ° 10 ′ 10 ″
Further data
Brightness  (B-band)	7.1 likes
Angular expansion	10 '× 8'
distance	1825 ly (560 pc)
history
discovery	Wilhelm Herschel
Date of discovery	October 18, 1794
Catalog names
NGC  7023 • IRAS  20599 + 6755 • Cr  429 • vdB  139 • Caldwell 4 • Ced 187 • LBN 487 • H IV 74 • GC 4634
Aladin previewer

NGC 7023 is the name of an open star cluster containing the Iris Nebula in the constellation Cepheus according to the nomenclature of the NGC catalog . NGC 7023 has an angular extent of 10 '× 8'. The Iris Nebula is a reflection nebula that is illuminated by a central star of apparent magnitude 7.1 mag.

The object was discovered by Sir William Herschel on October 18, 1794 .

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  Hubble image of the northwestern part

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  Mosaic of several Hubble recordings

Web links

• Spektrum.de : Collection of amateur recordings

Individual evidence

1. ↑ NASA / IPAC EXTRAGALACTIC DATABASE
2. ↑ ^{a b} SEDS : NGC 7023
3. ↑ AL Tadross: A catalog of 120 NGC open star cluster . In: Journal of the Korean Astronomical Society , 44, 2011, pp. 1-11. doi: 10.5303 / JKAS.2011.44.1.1 .
4. ↑ Seligman