NGC 7023
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 .
Hubble image of the northwestern part
Web links
- Spektrum.de : Collection of amateur recordings
Individual evidence
- ↑ NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ a b SEDS : NGC 7023
- ↑ 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 .
- ↑ Seligman