Astronomy:NGC 146
| NGC 146 | |
|---|---|
| File:250px Location of NGC 146 | |
| Observation data (J2000 epoch) | |
| Constellation | Cassiopeia |
| Right ascension | 00h 33m 03.9s[1] |
| Declination | +63° 18′ 32″[1] |
| Distance | 9.7 ± 1.1 kly (2.98 ± 0.33 kpc)[2] |
| Apparent magnitude (V) | 9.1[3] |
| Physical characteristics | |
| Estimated age | 20 Myr[2] |
| Other designations | Cr 5, OCl 299, C 0030+630[3] |
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.[4]
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 3,000 parsecs (10,000 light years) away.[5][2]
NGC 146 is close to the open cluster King 14, both being located in the Perseus Arm. The two clusters follow similar circular orbits throughout the Milky Way's thin disk, orbiting at a distance of 9,000 parsecs (29,000 light-years) from the Galactic Center with an orbital period of about 255 million years. The two likely originated from the same giant molecular cloud but are not gravitationally bound to each other.[2]
Characteristics
The cluster is fairly young, as there are numerous B-type and A-type main sequence stars[2] and pre-main-sequence stars but relatively few evolved supergiants. Among its most massive stars are two Herbig Be stars.[6]
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 2.2 2.3 2.4 Bisht, D.; Jiang, Ing-Guey; Elsanhoury, W. H.; Belwal, K.; Çinar, D. C.; Raj, A.; Biswas, Shraddha; Dattatrey, Arvind K. et al. (2026). "Dynamical and Photometric Analysis of NGC 146 and King 14: Evidence for a Comoving, Unbound Cluster Pair". The Astronomical Journal 171 (2): 72. doi:10.3847/1538-3881/ae285b. Bibcode: 2026AJ....171...72B.
- ↑ 3.0 3.1 "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.
- ↑ 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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