Astronomy: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

Notable small stars

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

Star name Star mean radius, kilometres Star class Notes References
CXOU J085201.4-461753 1.2 Neutron star [1]
PSR B0943+10 2.6 Pulsar (quark star?) Neutron stars are stellar remnants produced when a star of around 8-9 solar masses or more explodes in a supernova at the end of its life. They are usually produced by stars of less than 20 solar masses, although a more massive star may produce a neutron star in certain cases. PSR B0943+10 is one of the least massive stars, with 0.02 solar masses. [2]
CXO J232327.9+584842 2.7 Neutron star [1]
PSR B1257+12 10 Pulsar Orbited by three planets. [3]
PSR B0531+21 (Crab pulsar) 10 Relatively young at 997 years old as of October 2021. [4]
Geminga 10 [5]
Vela pulsar 10 [6]
XTE J1739-285 10.9 Pulsar (quark star?) [7]
PSR J0348+0432 A 13 ± 2 Pulsar Orbited by a white dwarf star (see below) [8]
PSR J1748-2446ad <16 Fastest-spinning pulsar known. [9]
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. [10]
HD 49798 1600 White dwarf Smallest white dwarf star known. [11]
ZTF J1901+1458 1809 [12]
GRW +70 8247 3300 [13]
Sirius B 5466 Historically first detected white dwarf star [14]
LB 1497 5494.5 [15]
40 Eridani B 5547.5
ZZ Ceti
GD 165
G 29-38
Procyon B 6700 [16][17]
ESO 439-26 8775.5 Faintest known white dwarf.[18]
Van Maanen 2 9048 [19]
PSR J0348+0432 B 45268 A white dwarf that orbits its pulsar companion (see above) [8]
WD 1145+017 13926.84 Host star of one of the smallest exoplanets. [20]
EBLM J0555-57Ab 59000 Red dwarf This red dwarf is slightly smaller than the planet Saturn. As of 2019, it is the second lightest hydrogen-fusing star known, marginally heavier (0.0777-0.0852M) than the 2MASS J0523-1403. Although its mass is comparable to that of TRAPPIST-1A, its radius is 1/3 smaller. [21][22][23]
SSSPM J0829-1309 61300 [24]
2MASS J0523-1403 70600 As in 2019, with mass 67.54±12.79MJ (0.0523-0.0767M) is the lowest known mass hydrogen-burning star. [25][24][26]
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. [27][28][29]
Gliese 229 B 83480 Brown dwarf [30]
TRAPPIST-1 84180 Red dwarf Hosts a planetary system with at least seven rocky planets. [31]
Teegarden's Star 88354 Two potentially habitable planets [32]
Luyten 726-8 (A and B) 97000 [33]
Proxima Centauri 101000 This is the nearest neighbouring star to the Sun. [34]
UY Sextantis 104500 White subdwarf [35]
Wolf 359 111400 Red dwarf [36]
Ross 248 111400 [37]
Barnard's Star 136400 A faint star, it has 1 planet orbiting it, an ice planet called Barnard B.[38]
CM Draconis B 167000 [39]
Ross 154 167000 [40]
CM Draconis A 176000 [39]
Z Andromedae B 184530.63[41] White dwarf Largest white dwarf [41]
Kapteyn's Star 203000 Red dwarf This is the closest halo star to the Sun. [34]
Luyten's Star 243500 [42]
Teide 1 270240 Brown dwarf [43]
Lalande 21185 273500 Red dwarf [34]
Lacaille 9352 320000 [34]

Smallest stars by type

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 References
Red dwarf EBLM J0555-57Ab 0.084 0.84 9.41 59,000 km (37,000 mi) 2017 The red dwarf stars are considered the smallest stars known, and representative of the smallest star possible. [21][22][23]
Brown dwarf Cha 110913-773444 0.18 1.8 20.17 128,686 km (79,962 mi) 2004 Brown dwarfs 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 hydrogen-fusing star. [44]
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 its 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. [13]
Neutron star PSR B0943+10 0.0000037356 0.0000363677 0.000407643 2.6 km

(1.61 mi)

1968 Neutron stars are stellar remnants produced by stars with around 9 solar masses or more explodes in a supernova at the end of its 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. PSR B0943+10 is one of the least massive stars with 0.02 solar masses.
Stellar-mass black hole XTE J1650-500 B 0.0000344828 0.000335702 0.00376285 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. [10]

Timeline of smallest red dwarf star recordholders

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-Today 0.084 0.84 59,000 km (37,000 mi) This star is slightly smaller than Saturn. [21][22][23]
2MASS J0523-1403 2013-2017 0.102 1.01 70,600 km (43,900 mi) Lowest mass main sequence star as in 2020. [25][24][45][26]
OGLE-TR-122B 2005-2013 0.117 1.16 81,100 km (50,400 mi) [27][28][29]

References

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