List of least voluminous stars
This is a list of stars which are the least voluminous known (the smallest stars by volume).
List
- This list is incomplete; you can help by expanding it.
| Star name | Radius Solar radii (Sun = 1) |
Radius Jupiter radii (Jupiter = 1) |
Notes | |
|---|---|---|---|---|
| Sirius B | 0.00874 | [1] | ||
| Procyon B | 0.01235 | [2] | ||
Smallest by type
| Type | Star name | Radius Solar radii (Sun = 1) |
Radius Jupiter radii (Jupiter = 1) |
Radius Earth radii (Earth = 1) |
Radius (km / mi) |
Date | Notes | |
|---|---|---|---|---|---|---|---|---|
| Red dwarf | 2MASS J0523-1403 | 0.086 | .896 | 9.39 | 2013 | This red dwarf is considered the smallest star known, and representative of the smallest star possible, which is not a brown dwarf or a dead star. | [3] | |
| Brown dwarf | ||||||||
| White dwarf | A.C.+70°8247 | 0.00000150734 | 0.00157316804 | 0.5 | 1934 | [4] | ||
| Neutron star | ||||||||
| Stellar-mass black hole | XTE J1650-500 B | 24 km (15 mi) | 2008 | This binary X-ray transient system, XTE J1650-500, component black hole, at 3.8 solar masses, is smaller than the previous recordholder GRO J1655-40 B of 6.3 MSun in the microquasar system GRO J1655-40. | [5] | |||
Smallest active stars
This is a listing of the smallest stars that are incontrovertibly stars that are still alive and fusing. Hence they are the smallest red dwarfs known, and those brown dwarfs that are known to be still in their short actively fusing phase.
| Star name | Radius Solar radii (Sun = 1) |
Radius Jupiter radii (Jupiter = 1) |
Type | Notes | |
|---|---|---|---|---|---|
| SSSPM J0829-1309 | 0.088 | .917 | Red dwarf | [6] | |
| OGLE-TR-122B | 0.120 | 1.16 | Red dwarf | This was once the smallest known actively fusing star, when found in 2005, through 2013. It is the smallest eclipsing red dwarf, and smallest observationally measured diameter. | [7][8][9] |
| Proxima Centauri | 0.145 | 1.510 | Red dwarf | This is the nearest neighbouring star to the Sun. | [9][10] |
| Barnard's Star | 0.196 | 2.042 | Red dwarf | [9][10] | |
| CM Draconis B | 0.2396 | 2.496 | Red dwarf | Part of the binary red dwarf system CM Draconis | [9][11] |
| CM Draconis A | 0.2534 | 2.640 | Red dwarf | Part of the binary red dwarf system CM Draconis | [9][11] |
| Kapteyn's Star | 0.291 | 3.031 | Red dwarf | This is the closest halo star to the Sun. | [9][10] |
| Star name | Date | Radius Solar radii (Sun = 1) |
Radius Jupiter radii (Jupiter = 1) |
Type | Notes | |
|---|---|---|---|---|---|---|
| 2MASS J0523-1403 | 2013— | 0.086 | .896 | Red dwarf | This red dwarf is considered the smallest star known, and representative of the smallest star possible that is not a brown dwarf. | [3][6] |
| OGLE-TR-122B | 2005-2013 | 0.120 | 1.16 | Red dwarf | This is the smallest eclipsing red dwarf, and smallest observationally measured diameter. | [7][8][9] |
References
- ↑ Zhang, B.; Reid, M. J.; Menten, K. M.; Zheng, X. W.; Brunthaler, A. (2012). "The distance and size of the red hypergiant NML Cygni from VLBA and VLA astrometry". Astronomy & Astrophysics 544: A42. arXiv:1207.1850. Bibcode:2012A&A...544A..42Z. doi:10.1051/0004-6361/201219587.
- ↑ name="Levesque2009"
- 1 2 John Bochanski (23 December 2013). "New Cutoff for Star Sizes". Sky and Telescope.
- ↑ Kuiper, G. P. (February 1936). "The White Dwarf A.C.+70°8247, the Smallest Star Known". Journal of the Royal Astronomical Society of Canada 30: 48. Bibcode:1936JRASC..30...48K.
- ↑ Andrea Thompson (1 April 2008). "Smallest Black Hole Found". Space.com.
- 1 2 Sergio B. Dieterich, Todd J. Henry, Wei-Chun Jao, Jennifer G. Winters, Altonio D. Hosey, Adric R. Riedel, John P. Subasavage (May 2014). "The Solar Neighborhood XXXII. The Hydrogen Burning Limit". The Astronomical Journal 147 (5): 25. arXiv:1312.1736. Bibcode:2014AJ....147...94D. doi:10.1088/0004-6256/147/5/94. 94.
- 1 2 Robert Roy Britt (3 March 2005). "Newfound Star Smaller than Some Planets". Space.com.
- 1 2 Jonathan O'Callaghan; Josh Barker (National Space Centre) (22 March 2013). "What is the smallest star?". SpaceAnswers.com.
- 1 2 3 4 5 6 7 Pont, F.; Melo, C. H. F.; Bouchy, F.; Udry, S.; Queloz, D.; Mayor, M.; Santos, N. C.; (27 January 2005). "A planet-sized transiting star around OGLE-TR-122. Accurate mass and radius near the hydrogen-burning limit". Astronomy and Astrophysics (April 2005) 433 (2): L21-L24. arXiv:astro-ph/0501611. Bibcode:2005A&A...433L..21P. doi:10.1051/0004-6361:200500025.
- 1 2 3 B.-O. Demory, D. Segransan, T. Forveille, D. Queloz, J.-L. Beuzit, X. Delfosse, E. Di Folco, P. Kervella, J.-B. Le Bouquin, C. Perrier (2 June 2009). "Mass-radius relation of low and very low-mass stars revisited with the VLTI". Astronomy and Astrophysics (October 2009) 505 (1): 205–215. arXiv:0906.0602. Bibcode:2009A&A...505..205D. doi:10.1051/0004-6361/200911976.
- 1 2 J.C. Morales, I. Ribas, C. Jordi, G. Torres, J. Gallardo, E.F. Guinan, D. Charbonneau, M. Wolf, D.W. Latham, G. Anglada-Escudé, D.H. Bradstreet, M.E. Everett, F.T. O'Donovan, G. Mandushev, R.D. Mathieu (February 2009) [8 October 2008]. "Absolute properties of the low-mass eclipsing binary CM Draconis". The Astrophysical Journal 691 (2): 1400–1411. arXiv:0810.1541. Bibcode:2009ApJ...691.1400M. doi:10.1088/0004-637X/691/2/1400.
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