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NGC 381

NGC 381
Observation data (J2000 epoch)
Right ascension01h 08m 19.9s[1]
Declination+61° 35′ 02″[1]
Distance3,120 ± 300 ly (957 ± 93 pc)[2]
Apparent magnitude (V)9.3[3]
Apparent dimensions (V)6′[1] or 7′[3]
Physical characteristics
Mass32.4+45.2
−18.9[4] M☉
Radius15 ly[5]
Estimated age316+39
−34[2]
Other designationsCollinder 10[6]
Associations
ConstellationCassiopeia[3]
See also: Open cluster, List of open clusters

NGC 381 is an open cluster of stars in the northern constellation of Cassiopeia, located at a distance of approximately 3,120 light-years from the Sun.[2] Credit for the discovery of this cluster was given to Caroline Herschel by her brother William in 1787, although she may never have actually seen it.[7]

This is a Trumpler class III 1 m cluster of intermediate age,[1] estimated at 316 million years. This class indicates the cluster is relatively weakly concentrated, with a small brightness range and an intermediate richness of stars. A total of 350 probable members have been identified, down to 20th magnitude,[2] and the cluster contains about 32 times the mass of the Sun.[4] The cluster has a core angular radius of 2.99′±0.93′ and an outer cluster radius of 5.6′±0.1′.[2] It has a physical tidal radius of 15 ly (4.7 pc).[5] No giant stars have been discovered in this cluster.[1] Four candidate variable stars have been found in the field of NGC 381; one of which is a suspected cluster member.[8] The eclipsing binary OX Cassiopeiae was once thought to be a member, but is now known to be a background star system.[9]

  1. ^ a b c d e Cite error: The named reference Ann2002 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Jayanand2018 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Finlay2014 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Joshi2016 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Piskunov2008 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference simbad was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Hoskin2006 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Hu2007 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Crinklaw1989 was invoked but never defined (see the help page).

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