NGC 5822

NGC 5822
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]
Associations
ConstellationLupus
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 Cite error: The named reference Cantat-Gaudin_Anders_2020 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Seligman was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Sun_et_al_2019 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Bonatto_Bica_2005 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Carraro_et_al_2011 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference ned was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Bruck_et_al_1968 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Dawson1978 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Katime_Santrich_et_al_2013 was invoked but never defined (see the help page).