NGC 5822

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NGC 5822
NGC 5822.png
NGC 5822 (taken from Stellarium)
Observation data (J2000 epoch)
Right ascension15h 4m 21.(2)s[1]
Declination−54° 23′ 5(8)″[1]
Distance2,682 ly (822.3 pc)[1]
Apparent magnitude (V)6.5[2]
Physical characteristics
Mass~1.7×103[3] M
Radius26.1 ± 1.3 ly (8.0 ± 0.4 pc)[4]
Estimated age900±100 Myr[5]
Other designationsNGC 5822, Cr 289, ESO 176-SC 009[6]
See also: Open cluster, List of open clusters

NGC 5822 is an open cluster of stars in the southern constellation of Lupus.[7] It was discovered by English Astronomer John Herschel on July 3, 1836,[2] and lies close to another cluster, NGC 5823, which suggests there may be a physical association.[8][9]

NGC 5822 is an intermediate age cluster, estimated at around 900 million years old, and it is located nearby[3] at a distance of 2,700 light years.[1] The Trumpler class of this cluster is III 2m.[9] It is richly populated[5] with half the cluster members lying within an angular radius of 22.1.[1] The cluster is considered low mass at ~1,700 times the mass of the Sun.[3] It has a core radius of 1.1±0.1 pc and a limiting radius of 8.0±0.4 pc.[4]

Measuring the abundances of a set of F-type stars that are probable members demonstrates the cluster metallicity is very similar to the Sun.[5] It displays an extended main sequence turnoff on the Hertzsprung–Russell diagram, most likely due to differences in stellar rotation.[3] Two barium stars have been identified in NGC 5822, making it only the second cluster shown to host these objects as of 2013.[10]



  1. ^ a b c d e Cantat-Gaudin, T.; Anders, F. (January 2020). "Clusters and mirages: cataloguing stellar aggregates in the Milky Way". Astronomy & Astrophysics. 633: 22. arXiv:1911.07075. Bibcode:2020A&A...633A..99C. doi:10.1051/0004-6361/201936691. A99.
  2. ^ a b Seligman, Courtney. "NGC Objects: NGC 5800 - 5849". Celestial Atlas. Retrieved 2021-12-29.
  3. ^ a b c d Sun, Weijia; et al. (May 2019). "Stellar Rotation and the Extended Main-sequence Turnoff in the Open Cluster NGC 5822". The Astrophysical Journal. 876 (2): 9. arXiv:1904.03547. Bibcode:2019ApJ...876..113S. doi:10.3847/1538-4357/ab16e4. 113.
  4. ^ a b Bonatto, C.; Bica, E. (July 2005). "Detailed analysis of open clusters: A mass function break and evidence of a fundamental plane". Astronomy and Astrophysics. 437 (2): 483–500. arXiv:astro-ph/0503589. Bibcode:2005A&A...437..483B. doi:10.1051/0004-6361:20042516.
  5. ^ a b c Carraro, Giovanni; et al. (October 2011). "A UBVI and uvbyCaHβ Analysis of the Intermediate-age Open Cluster, NGC 5822". The Astronomical Journal. 142 (4): 18. arXiv:1108.0587. Bibcode:2011AJ....142..127C. doi:10.1088/0004-6256/142/4/127. 127.
  6. ^ "NASA/IPAC Extragalactic Database". Results for NGC 5749. Retrieved 2007-04-06.
  7. ^ "NGC 5822". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-12-29.
  8. ^ Bruck, Mary T.; et al. (1968). "Three-colour photometry of southern galactic clusters IV: NGC 5822, 5823". Publications of the Royal Observatory, Edinburgh. 6 (9): 209–223. Bibcode:1968PROE....6..210B.
  9. ^ a b Dawson, D. W. (November 1978). "DDO photometry of giants in four southern open clusters". Astronomical Journal. 83: 1424–1429. Bibcode:1978AJ.....83.1424D. doi:10.1086/112334.
  10. ^ Katime Santrich, O. J.; et al. (August 2013). "Two Barium Stars in the Open Cluster NGC 5822". The Astronomical Journal. 146 (2): 12. Bibcode:2013AJ....146...39K. doi:10.1088/0004-6256/146/2/39. 39.

External links[edit]

Coordinates: Sky map 15h 04m 21.2s, −54° 23′ 47″