List of smallest stars

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This is a list of stars which are the least voluminous known (the smallest stars by volume).

List[edit]

Notable small stars[edit]

This is a list of small stars that are otherwise notable for characteristics that are not separately listed.

Star name Star mean radius, km Star class Notes References
PSR J0348+0432 A 6.5 + 1 pulsar Orbited by a white dwarf star (see below) [1]
PSR B1257+12 10 Orbited by three planets. [2]
XTE J1650-500 B 24 black hole 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. [3]
GRW +70 8247 3300 white dwarf Smallest white dwarf star known [4]
Sirius B 5466 Historically first detected white dwarf star [5]
Procyon B 6700 [6][7]
Van Maanen 2 9048 [8]
PSR J0348+0432 B 45268 A white dwarf that orbits its pulsar companion (see above) [1]
EBLM J0555-57Ab 59000 red dwarf This red dwarf is slightly larger than the planet Saturn. As of 2017, it is the smallest hydrogen-fusing star known, marginally heavier than the hydrogen burning mass limit separating stellar objects and the sub-stellar brown dwarfs. Although its mass is comparable to that of TRAPPIST-1A, its radius is 1/3 smaller. [9][10][11]
2MASS J0523-1403 60000 This red dwarf was considered, as in 2013, to be the smallest star known, and representative of the smallest star possible, which is not a brown dwarf or a dead star. [12][13]
SSSPM J0829-1309 61300 [13]
TRAPPIST-1 79400 Hosts a planetary system with at least seven rocky planets [14]
OGLE-TR-122B 81100 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. [15][16][17]
Luyten 726-8 (A and B) 97000 [18]
Proxima Centauri 101000 This is the nearest neighbouring star to the Sun. [19]
Wolf 359 111400 [20]
Ross 248 111400 [21]
Barnard's Star 136000 [19]
CM Draconis B 167000 [22]
Ross 154 167000 [23]
CM Draconis A 176000 [22]
Kapteyn's Star 203000 This is the closest halo star to the Sun. [19]
Luyten's Star 243500 [24]
Lalande 21185 273500 [25]
Lacaille 9352 320000 [26]

Smallest stars by type[edit]

List of the smallest stars by star 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 EBLM J0555-57Ab 0.084 0.84 59,000 km (37,000 mi) 2017 The red dwarf stars are considered the smallest stars known, and representative of the smallest star possible. [9][10][11]
Brown dwarf Brown dwarfs are not true stars as they are not massive enough to build up the pressure in the central regions to allow nuclear fusion of hydrogen into helium. They are best described as extremely massive gas giants that were not able to ignite into a star.
White dwarf GRW +70 8247 0.0047 0.047 0.52 3,300 km (2,100 mi) 1934 White dwarfs are stellar remnants produced when a star with around 8 solar masses or less sheds it's outer layers into a planetary nebula. The leftover core becomes the white dwarf. It is thought that white dwarfs cool down over quadrillions of years to produce a black dwarf. [4]
Neutron star PSR J0348+0432 A Neutron stars are stellar remnants produced by stars with around 9 solar masses or more explodes in a supernova at the end of it's life. They are usually produced by stars with less than 20 solar masses, although a more massive star may produce a neutron star in certain cases.
Stellar-mass black hole XTE J1650-500 B 24 km (15 mi) 2008 Black holes are stellar remnants usually produced when extremely massive stars explode in a supernova or hypernova at the end of their lives. [3]

Timeline of smallest red dwarf star recordholders[edit]

Red dwarfs are considered the smallest star known that are active fusion stars, and are the smallest stars possible that is not a brown dwarf.

List of smallest red dwarf titleholders
Star name Date Radius
Solar radii
(Sun = 1)
Radius
Jupiter radii
(Jupiter = 1)
Radius
km
(mi)
Notes
EBLM J0555-57Ab 2017— 0.084 0.84 59,000 km (37,000 mi) This star is slightly larger than the planet Saturn. [9][10][11]
2MASS J0523-1403 2013-2017 0.086 0.86 60,000 km (37,000 mi) [12][13][27]
OGLE-TR-122B 2005-2013 0.120 1.16 81,100 km (50,400 mi) [15][16][17]

References[edit]

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