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{{Infobox open cluster
| image = NGC_2439.png
| caption = NGC 2439 (taken from Stellarium)
| name = NGC 2439
| type = Open Cluster
| epoch = J2000
| ra = {{RA|07|40.8}}
| dec = {{DEC|−31|41}}
| dist_ly = {{Convert|3.855|kpc|kly|abbr=on}}[3]
| appmag_v = 6.9
| size_v = 10″[5]
| radius_ly =
| absmag_v =
| constellation = Puppis
| notes =
| names = C 0738-315
}}NGC 2439 is an open cluster of stars in the constellation Puppis. It has an apparent magnitude of 6.9, an angular size of 10 arcminutes and is visible using a small telescope.[5] This cluster is about 3.855 kpc from the Solar System and has an age of about 10 million years.[3][9] Observationally, this cluster is along the line of sight of 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.[10]References1. ^1 2 {{cite book | first=Michael E. | last=Bakich | date=2010 | page=29 | title=1001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers | series=Patrick Moore's Practical Astronomy Series | publisher=Springer | isbn=978-1-4419-1776-8 }}
2. ^1 2 {{cite journal | title=Tidal radii and masses of open clusters | author=Piskunov, A. E. | display-authors=4 | author2=Schilbach, E. | author3=Kharchenko, N. V. | author4=Röser, S. | author5=Scholz, R.-D. | journal=Astronomy and Astrophysics | volume=477 | issue=1 | pages=165–172 |date=January 2008 | doi=10.1051/0004-6361:20078525 | bibcode=2008A&A...477..165P }} See online data.
3. ^1 {{cite journal | title=The distribution of bright OB stars in the Canis Major-Puppis-Vela region of the Milky Way | author=Kaltcheva, N. T. | author2=Hilditch, R. W. | journal=Monthly Notices of the Royal Astronomical Society | volume=312 | issue=4 | pages=753–768 |date=March 2000 | doi=10.1046/j.1365-8711.2000.03170.x | bibcode=2000MNRAS.312..753K }}
4. ^1 {{cite journal | author=Dias W.S. | author2=Alessi B.S. | author3=Moitinho A.| author4=Lepine J.R.D. | title=New catalog of optically visible open clusters and candidates | journal=Astronomy and Astrophysics | volume=389 | issue=3 | pages=871–873 |date=July 2002 | doi=10.1051/0004-6361:20020668 | bibcode=2002A&A...389..871D |arxiv = astro-ph/0203351 }} Note: see the VizieR catalogue B/ocl.
}}{{Ngc25}}{{star-cluster-stub}} 3 : Puppis|NGC objects|Open clusters |