NGC 7822

NGC 7822
Emission nebula
Ced 214 and NGC 7822
Observation data: J2000 epoch
Right ascension00h 01m 08.58s[1]
Declination+67° 25′ 17.0″[1]
Distance2900 ly   (900[1] pc)
Apparent diameter100′[2]
ConstellationCepheus
Physical characteristics
Radius75[3] ly   (23 pc)
DesignationsLBN 589, Sh 2-171[4]
See also: Lists of nebulae

NGC 7822 is a young star forming complex in the constellation of Cepheus. The complex encompasses the emission region designated Sharpless 171, and the young cluster of stars named Berkeley 59. The complex is believed to be some 800–1000 pc distant,[5][6] with the younger components aged no more than a few million years.[5][6] The complex also includes one of the hottest stars discovered within 1 kpc of the Sun, namely BD+66 1673, which is an eclipsing binary system consisting of an O5V that exhibits a surface temperature of nearly 45,000 K and a luminosity about 100,000 times that of the Sun.[5] The star is one of the primary sources illuminating the nebula and shaping the complex's famed pillars of creation-type formations, the elephant trunks.[5][7][8]

  1. ^ a b c Quireza, Cintia; Rood, Robert T.; Bania, T. M.; Balser, Dana S.; MacIel, Walter J. (2006). "The Electron Temperature Gradient in the Galactic Disk". The Astrophysical Journal. 653 (2): 1226–1240. arXiv:astro-ph/0609006. Bibcode:2006ApJ...653.1226Q. doi:10.1086/508803. S2CID 15671512.
  2. ^ "Revised NGC Data for NGC 7822 - Hartmut Frommert - SEDS". seds.org. Retrieved 14 March 2017.
  3. ^ Seligman, Courtney. "New General Catalogue objects: NGC 7800 - 7840". cseligman.com. Retrieved 14 March 2017.
  4. ^ "NGC 7822". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 14 March 2017.
  5. ^ 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, Journal of the American Association of Variable Star Observers, vol. 36, no. 1, p. 90
  6. ^ 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
  7. ^ Gahm G. F., Carlqvist P., Johansson L. E. B., Nikolić S. (2008). Rotating elephant trunks, Astronomy and Astrophysics, Volume 454, Issue 1, July IV 2006, pp.201-212
  8. ^ Fernandez, Antonio (2008). Sharpless 171, APOD, October 18, 2008