Astronomy:NGC 146
| NGC 146 | |
|---|---|
 Location of NGC 146 | |
| Observation data (J2000 epoch) | |
| Constellation | Cassiopeia |
| Right ascension | 00h 33m 03.9s[1] |
| Declination | +63° 18′ 32″[1] |
| Distance | ~10000 (~3000) |
| Apparent magnitude (V) | 9.1[2] |
| Physical characteristics | |
| Estimated age | <10 Myr |
| Other designations | Cr 5, OCl 299, C 0030+630[2] |
NGC 146 is a small open cluster in the constellation Cassiopeia. It was discovered by John Herschel in 1829 using his father's 18.7 inch reflecting telescope.[3]
Location
NGC 146 is fairly easy to locate in the sky, being half a degree away from the bright star Kappa Cassiopeiae. However, spotting the cluster itself is difficult because of its low apparent magnitude of 9.1. Its relatively high declination of about 63° means it is not visible for below 27° S. Its distance is estimated at about 3030 parsecs (9880 light years ),[4] but may be around 3500 pc (11000 ly) away.[5]
Characteristics
The cluster is at most 10 million years old, as there are numerous B-type main sequence stars and pre-main-sequence stars but relatively few evolved supergiants. Among its most massive stars are two Herbig Be stars.[5]
References
- ↑ 1.0 1.1 "NASA/IPAC Extragalactic Database". Results for NGC 0146. http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+146&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES.
- ↑ 2.0 2.1 "NGC 146". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+146.
- ↑ "Catalogo NGC/IC online - result for NGC 146". http://www.ngcicproject.org/pubdb.htm.
- ↑ "WEBDA page for open cluster NGC 146". http://www.univie.ac.at/webda/cgi-bin/ocl_page.cgi?dirname=ngc0146.
- ↑ 5.0 5.1 Subramaniam, A.; Sahu, D. K.; Sagar, R.; Vijitha, P. (September 2005). "NGC 146: a young open cluster with a Herbig Be star and intermediate mass pre-main sequence stars". Astronomy and Astrophysics 440 (2): 511‐522. doi:10.1051/0004-6361:20052683. Bibcode: 2005A&A...440..511S.
Further reading
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