Astronomy:NGC 2509
| NGC 2509 | |
|---|---|
 DSS image of NGC 2509 | |
| Observation data (J2000 epoch) | |
| Constellation | Puppis |
| Right ascension | 08h 00m 48s[1] |
| Declination | −19° 03′ 06″[1] |
| Distance | 9,500 ly (2,900 pc[1]) |
| Apparent magnitude (V) | 9.3[2] |
| Apparent dimensions (V) | 2.5 ± 0.5′ |
| Physical characteristics | |
| Estimated age | 1,200 Myr[1] |
| Other designations | NGC 2509, Cr 171, Mel 81, OCl 630[2] |
NGC 2509 is an open cluster in the constellation of Puppis. It was discovered on 3 December 1783 by William Herschel.[3] It was described as "bright, pretty rich, slightly compressed" by John Louis Emil Dreyer, the compiler of the New General Catalogue.[3]
The cluster is about 14 light-years (4.2 parsecs) wide,[1] but the cluster's other parameters remain poorly known. Some studies have estimated a distance of about 9,500 light-years (2,900 parsecs) away from the Solar System,[1] while older estimates put it at only 2980 light-years (912 parsecs) away.[4] Estimates of the cluster's age have also varied significantly, from 1.2 billion years old[1] to 8 billion years old.[4] The latest analysis based on the parallaxes measured by the Gaia spacecraft confirms that it is a relatively distant object, with a distance between 2500 and 3000 parsecs.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Carraro, G.; Costa, E. (2007). "Photometry of the five marginally studied open clusters Collinder 74, Berkeley 27, Haffner 8, NGC 2509, and VdB-Hagen 4". Astronomy & Astrophysics 464 (2): 573. doi:10.1051/0004-6361:20066350. Bibcode: 2007A&A...464..573C.
- ↑ 2.0 2.1 "NGC 2509". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+2509.
- ↑ 3.0 3.1 "New General Catalog Objects: NGC 2500 - 2549". http://cseligman.com/text/atlas/ngc25.htm#2509. Retrieved 9 August 2017.
- ↑ 4.0 4.1 Sujatha, S.; Babu, G. S. D. (2003). "Study of open cluster NGC 2509". Bulletin of the Astronomical Society of India 31: 9–18. Bibcode: 2003BASI...31....9S.
- ↑ Cantat-Gaudin, T.Expression error: Unrecognized word "et". (2018). "A Gaia DR2 view of the open cluster population in the Milky Way". Astronomy & Astrophysics 618: A93. doi:10.1051/0004-6361/201833476. Bibcode: 2018A&A...618A..93C.
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