NGC 637

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NGC 637
Observation data (J2000.0 epoch)
Right ascension 01h 43.1m[1]
Declination +64° 02′[1]
Distance 7,045 ly (2,160 pc)[1]
Apparent magnitude (V) 8.2[2]
Apparent dimensions (V) 4.2′[3]
Physical characteristics
Estimated age 10 ± 5 myr[3]
Other designations NGC 637, Collinder 17[2]
See also: Open cluster, List of open clusters

NGC 637 is an open cluster of stars in the constellation Cassiopeia. It has a Trumpler classification of I2m and an angular diameter of 4.2′. At a distance of approximately 7,045 light years, this corresponds to a diameter of 9.8 light-years (3.0 pc). The estimated age of this cluster is 5–15 million years.[3][1]


  1. ^ a b c d Kharchenko, N. V.; Piskunov, A. E.; Röser, S.; Schilbach, E. et al. (August 2005). "Astrophysical parameters of Galactic open clusters". Astronomy and Astrophysics 438 (3): 1163–1173. arXiv:astro-ph/0501674. Bibcode:2005A&A...438.1163K. doi:10.1051/0004-6361:20042523. 
  2. ^ a b "NGC 637 -- Open (galactic) Cluster". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2011-01-28. 
  3. ^ a b c Yadav, R. K. S.; Kumar, Brijesh; Subramaniam, A.; Sagar, Ram et al. (November 2008). "Optical and near-infrared photometric study of the open cluster NGC 637 and 957". Monthly Notices of the Royal Astronomical Society 390 (3): 985–996. arXiv:0810.1409. Bibcode:2008MNRAS.390..985Y. doi:10.1111/j.1365-2966.2008.13740.x.