NGC 7822
| Emission nebula | |
|---|---|
| NGC 7822
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| Cederblad 214 and the NGC 7822 Nebula | |
| AladinLite | |
| Constellation | Cepheus |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 00 h 03 m 35.3 s |
| declination | + 67 ° 09 ′ 42 ″ |
| Appearance
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| Angular expansion | 100.0 ' |
| Ionizing source | |
| designation | BD + 66 1673 |
| Physical data
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| distance | 3000 ly |
|
history
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| discovery | John Herschel |
| Date of discovery | November 16, 1829 |
| Catalog names | |
| NGC 7822 • GC 5051 • h 2302 • Ced 215, LBN 589 | |
NGC 7822 is an emission nebula , a birthplace of many stars in the constellation of Cepheus . The emission nebula itself is also known as Sharpless 171 , and the star cluster as Berkeley 59 . It is believed that this area is 800-1000 pc away.
The younger stars of the star cluster are a few million years old, some stars are among the hottest within 1kpc of the Sun, in particular BD + 66 1673, an eclipsing binary system that consists of a class O5V star with a surface temperature of 45,000 Kelvin and a ~ 100,000 luminosity of the sun. This star is the primary source that makes the nebula shine, and it forms the Pillars of Creation- like elephant trunks .
The object was discovered on November 16, 1829 by John Herschel .
Individual evidence
- ↑ NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ SEDS : NGC 7822
- ↑ a b c d Majaess D., Turner D., Lane D., Moncrieff K. (2008). The Exciting Star of the Berkeley 59 / Cepheus OB4 Complex and Other Chance Variable Star Discoveries , JAAVSO, vol. 36, no. 1, p. 90, bibcode : 2008JAVSO..36 ... 90M
- ↑ a b Pandey et al. (2008). Stellar contents and star formation in the young star cluster Be 59 , MNRAS, Volume 383, Issue 3, pp. 1241-1258, bibcode : 2008MNRAS.383.1241P
- ↑ Gahm GF, Carlqvist P., Johansson LEB, Nikolić S. (2008). Rotating elephant trunks , Astronomy and Astrophysics, Volume 454, Issue 1, July IV 2006, pp.201–212, bibcode : 2006A & A ... 454..201G
- ↑ Fernandez, Antonio (2008). Sharpless 171 , APOD, October 18, 2008
- ↑ Astronomy Picture of the Day : NGC 7822 in Cepheus , 2010 October 22
- ↑ Seligman
Web links
- SIMBAD Astronomical Database
- Spektrum.de : Amateur recordings [1] [2] [3] [4] [5]