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] |
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]
References
- ↑ 1.0 1.1 1.2 1.3 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.
- ↑ 2.0 2.1 "NGC 637 -- Open (galactic) Cluster". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2011-01-28.
- ↑ 3.0 3.1 3.2 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.