| NGC 2439 | |
|---|---|
 NGC 2439 (taken from Stellarium) | |
| Observation data (J2000 epoch) | |
| Right ascension | 07 40 45.0 |
| Declination | −31° 41′ 36″ |
| Distance | 3.855 kpc (12.57 kly) |
| Apparent magnitude (V) | 6.9 |
| Apparent dimensions (V) | 10″ |
| Physical characteristics | |
| Radius | 82 ± 23 ly (tidal) |
| Other designations | Cr 158, C 0738-315 |
| Associations | |
| Constellation | Puppis |
| See also: Open cluster, List of open clusters | |
NGC 2439 is a sparse open cluster of stars in the constellation Puppis. It has an apparent visual magnitude of 6.9, an angular size of 10 arcminutes, and is visible using a small telescope. This is a young cluster with age estimates in the range of 20–300 million years. It has a tidal radius of approximately 82 light years. No chemically peculiar stars have been found.
Distance estimates to this cluster vary widely. Piskunov and associates (2008) gave an estimate of 3,855 kpc. A value in the range 3–4 kpc means the cluster lies well below the Galactic Plane. It is positioned in a hole in the Milky Way's gas and dust, with the reduced absorption resulting in a lower than expected extinction of 1.27 in visual magnitude. This result raises the question of whether this cluster actually exists. It is positioned along the same line of sight as two groups of B-type supergiant stars. The nearer group is located at a distance of 1.03 kpc, while the second group is at 3.2 kpc.
Gallery
-
Map showing the location of NGC 2439
References
- ^ Wu, Zhen-Yu; et al. (November 2009). "The orbits of open clusters in the Galaxy". Monthly Notices of the Royal Astronomical Society. 399 (4): 2146–2164. arXiv:0909.3737. Bibcode:2009MNRAS.399.2146W. doi:10.1111/j.1365-2966.2009.15416.x. S2CID 6066790.
- ^ Piskunov, A. E.; Schilbach, E.; Kharchenko, N. V.; Röser, S.; et al. (January 2008). "Tidal radii and masses of open clusters". Astronomy and Astrophysics. 477 (1): 165–172. Bibcode:2008A&A...477..165P. doi:10.1051/0004-6361:20078525. See online data.
- ^ "NGC 2439". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-09-01.
- ^ Bakich, Michael E. (2010). 1001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers. Patrick Moore's Practical Astronomy Series. Springer. p. 29. ISBN 978-1-4419-1776-8.
- ^ Kaltcheva, N.; et al. (June 2001). "The association surrounding NGC 2439". Astronomy and Astrophysics. 372: 95–104. Bibcode:2001A&A...372...95K. doi:10.1051/0004-6361:20010380.
- ^ Paunzen, E.; Maitzen, H. M. (April 2002). "CCD photometric search for peculiar stars in open clusters. III. NGC 2439, NGC 3960, NGC 6134, NGC 6192 and NGC 6451". Astronomy and Astrophysics. 385 (3): 867–873. Bibcode:2002A&A...385..867P. doi:10.1051/0004-6361:20020184.
- Dias W.S.; Alessi B.S.; Moitinho A.; Lepine J.R.D. (July 2002). "New catalog of optically visible open clusters and candidates". Astronomy and Astrophysics. 389 (3): 871–873. arXiv:astro-ph/0203351. Bibcode:2002A&A...389..871D. doi:10.1051/0004-6361:20020668. S2CID 18502004. Note: see the VizieR catalogue B/ocl.
- Kaltcheva, N. T.; Hilditch, R. W. (March 2000). "The distribution of bright OB stars in the Canis Major-Puppis-Vela region of the Milky Way". Monthly Notices of the Royal Astronomical Society. 312 (4): 753–768. Bibcode:2000MNRAS.312..753K. doi:10.1046/j.1365-8711.2000.03170.x.
External links
Media related to NGC 2439 at Wikimedia Commons
| Astronomical catalogs | |
|---|---|
| NGC | |
| Collinder | |