NGC 637

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.^[1][3]

References

1. ^ ^{a b c d} Kharchenko, N. V.; Piskunov, A. E.; Röser, S.; Schilbach, E.; Scholz, R.-D. (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. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC+637. Retrieved 2011-01-28. 
3. ^ ^{a b c} Yadav, R. K. S.; Kumar, Brijesh; Subramaniam, A.; Sagar, Ram; Mathew, Blesson (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. Bibcode 2008MNRAS.390..985Y. doi:10.1111/j.1365-2966.2008.13740.x.