NGC 146
NGC 146 is a small open cluster in the constellation Cassiopeia.
![](../I/m/NGC_146_map.png)
Observation History
NGC 146 was identified for the first time by John Herschel in 1829 through the reflecting telescope from 18.7 inches that belonged to his father, William; Then he placed it in his General Catalogue of Nebulae and Clusters with the number 71.[1]
Location
NGC 146 is an open inconspicuous storage; its distance is estimated at about 3032 parsecs (9884 light years ),[2] or, according to other estimates, around 3500 parsecs (11,410 years light),[3] and is located in a remote part of the Perseus Arm or perhaps in an inter-arm area, in a region situated beyond the large OB associations of Cassiopeia and relatively little known, except for the presence of several molecular clouds.[4]
Characteristics
The cluster is at most 10 million years old, as is evident from the presence of numerous stars of spectral type B of the main sequence, and the absence of evolved supergiants, as well as the existence of a population of stars of the pre-main-sequence; among its most massive stars there are two Herbig Be stars.[3]
References
- ↑ "Catalogo NGC/IC online - result for NGC 146". Retrieved July 23, 2013.
- ↑ WEBDA page for open cluster NGC 146, univie.ac.at.
- 1 2 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. Retrieved July 23, 2013.
- ↑ Come si evince dai dati riportati nella "Mappa della regione attorno a NGC 146". Galaxy Map. Retrieved 23 July 2013.
Further reading
- "Catalogo NGC/IC online".
- Tirion, Rappaport, Lovi, Uranometria 2000.0, William-Bell inc. ISBN 0-943396-14-X
External links
- Oggetti non stellari nella costellazione di Cassiopea