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List of smallest known stars

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This is a list of stars, neutron stars, white dwarfs and brown dwarfs 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 nameStar mean radius, kilometresStar classNotesReferences
RX J0720.4−31254.50+0.08
−0.09 – 5.38+0.13
−0.14		Neutron starNeutron 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.[1]
4U 1820-309.1Pulsar[2]
PSR B0943+1010 or 2.6[a]Pulsar (quark star?)[3]
PSR B1257+1210PulsarOrbited by three planets.[4]
PSR B0531+21 (Crab pulsar)10Relatively young at 7200 (or 970 relative to Earth) years old as of May 2024.[5]
Geminga10[6]
XTE J1739-28510.9Pulsar (quark star?)[7]
PSR J1906+074611.99 – 12.85Pulsar[8]
PSR J2043+171112.13 – 12.96[8]
PSR J1933–621112.15 – 12.98[8]
Vela pulsar12.52 – 13.30[8]
PSR J0348+0432 A13 ± 2Orbited by a white dwarf star (see below)[9]
PSR J1614−223013 ± 2[10]
GX 13+1≲14.50Neutron star[11]
PSR J1748-2446ad<16PulsarFastest-spinning pulsar known.[12]
RX J1856.5−375419Neutron starClosest neutron star discovered to date.[13]
PSR B1620-26 A24PulsarAn exoplanet orbits PSR B1620-26 A and its white dwarf companion (see below) in a circumbinary orbit.
HD 497981,600White dwarfOne of the smallest white dwarf stars known.[14]
ZTF J1901+14581,809Currently the most massive white dwarf known.[15]
GRW +70 82473,300[16]
Janus3,400A white dwarf with a side or hydrogen and another side of helium.[17]
Wolf 1130 B3,480[18]
BPM 370933,965.5
IK Pegasi B4,174The nearest supernova candidate. (Type Ia)[19]
Sirius B5,466Historically first detected white dwarf star[20]
LB 14975,494.5[21]
40 Eridani B5,547.5
U Geminorum white dwarf5,565[22]
Gliese 9156,748.3[23]
AR Scorpii6,950The only known white dwarf pulsar[24]
LP 145-1416,9504th nearest white dwarf.[25]
PSR B1620-26 B6,950An exoplanet orbits PSR B1620-26 B and its pulsar companion (see above) in a circumbinary orbit.
G 29-386,950[26]
WD 0810–3536,950[27]
Van Maanen 27,6503rd nearest white dwarf.[28]
QS Virginis A7,658[29]
Stein 2051 B7,930[30]
Ross 548 (ZZ Ceti)8,209[31]
DQ Herculis A8,420[32]A slow, bright nova that reached peak brightness on 22 December 1934 with an apparent magnitude of 1.5.[33]
Procyon B8,595Second nearest white dwarf.[34]
GD 165 A8,626.5[31]
ESO 439-268,775.5Faintest known white dwarf.[35]
Gliese 2938,900[b][23]
Wolf 4899,044[36]
HD 44120 C9,044[37]
WD 1856+5349,113.67[38]
Epsilon Reticuli B9,185[39]
KOI-256 B9,350[40]
RR Caeli white dwarf10,908.5[41]
WD 1145+01713,926.84Host star of one of the smallest exoplanets.[42]
NN Serpentis white dwarf14,679.5[43]
Beta Crateris B18,800[44]
Central star of the Dumbbell Nebula38,265[45]
KPD 0005+510641,045Hottest known white dwarf.[46]
PSR J0348+0432 B45,268A white dwarf that orbits its pulsar companion (see above)[9]
TMTS J052610.43+593445.145,916B-type subdwarfSmallest known non-degenerate star.[47]
WISEA 1810−101046,840Brown dwarfSmallest known brown dwarf.[48]
EPIC 201702477 [fr]54,120[49]
Epsilon Indi Ba55,656[50]
LHS 6343 C55,978[51]
Epsilon Indi Bb57,050[50]
54 Piscium B57,050[52]
2MASS J1126−500357,193.5[53]
UGPS J0521+364057,193.5
Wolf 1130 C58,625[54]
EBLM J0555-57Ab60,000Red dwarfThis red dwarf has a size comparable to that of 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-1, its radius is 1/3 smaller.[55][56][57]
Luhman 16 A60,768Brown dwarfLuhman 16 A and Luhman 16 B are the closest brown dwarf stars to Earth, and the third-nearest star system to the Solar System.[c]
SSSPM J0829-130961,300Red dwarfAn L2 dwarf that is fusing hydrogen. Similarly to 2MASS J0523-1403, SSSPM J0829-1309 is one of the least luminous and massive hydrogen-fusing stars, and is smaller than Jupiter.[58][59]
WISE 1405+553461,483Brown dwarf[60]
2MASS 0939-2448 B62,600[61]
WISE 0855−071463,500Coolest known brown dwarf.[62][d]
2MASS 0243−245364,000[63]
W1906+4064,350In 2015 it was shown to have on its surface a storm the size of Jupiter's Great Red Spot. 
2MASS J0348−602264,700[64]
SDSS J1416+1348 A65,772.5[65]
WISEPC J205628.90+145953.366,487.5[60]
WISE 1738+273266,487.5[60]
SCR 1845−6357 A66,790Red dwarf
2MASS 0937+293167,200Brown dwarf[66]
WISE 0359−540167,200In June 2023, it became the first Y-dwarf with a spectral energy distribution measured by the James Webb Space Telescope.[67][68]
2MASS J22282889–431026267,200[69]
SDSS J1416+1348 B67,200[70]
DENIS J081730.0−61552067,200[66]
WISE 2150–7520 B67,900[71]
Kelu-1 B67,900
Kelu-1 A68,180
DENIS 0255−470069,570[72]
R Aquarii B69,570White dwarfPart of a symbiotic binary star system containing a red giant and a white dwarf.[73]
HD 114762 B69,570Red dwarf[74]
2MASS J0407+154669,570Brown dwarf[75]
HN Pegasi B70,265[76]
2MASS J0523-140370,600Red dwarfAs in 2019, with mass 67.54±12.79MJ (0.0523-0.0767M☉) is the lowest known mass hydrogen-burning star.[77][58][66]
GD 165 B71,492Brown dwarf[78]
15 Sagittae B71,492[79]
DENIS-P J1058.7−154871,492[80]
LHS 292471,657Red dwarf[81]
2MASS 0036+182172,200Brown dwarf[66]
UGPS 0722-0572,850Possibly a rogue planet[82]
WISE 2150–7520 A73,635[71]
Luhman 16 B74,350Luhman 16 B and Luhman 16 A are the closest brown dwarf stars to Earth, and the third-nearest star system to the Solar System.[c]
DENIS J1048−395675,135.5Red dwarf[83]
DX Cancri76,527[84]
LHS 29276,527[85]
TVLM 513-4654676,527Has one confirmed exoplanet
Gliese 229 B79,000Brown dwarf
HR 2562 B79,350Its mass is quite uncertain, at 29±15 MJ .[86] It is cited by the NASA Exoplanet Archive as the most massive exoplanet known.[87][88]
OGLE-TR-122B81,100Red dwarfThis 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.[89][90][91]
CoRoT-15b82,200Brown dwarf[92]
VB 1082,300Red dwarfIt was the smallest known star from 1948 to 1981.[93]
TRAPPIST-182,925Hosts a planetary system with at least seven rocky planets.[94]
LHS 209083,500[95]
Teegarden's Star83,500Has two potentially habitable planets.[96]
VB 884,450[93]
2MASS 0939-2448 A87,220Brown dwarf[97]
Gliese 412 B90,400Red dwarf[98]
CFBDSIR 1458+10 B90,450Brown dwarf
Gliese 100295,310Red dwarfHas two confirmed exoplanets[99]
Wolf 424 B97,400[100]
LHS 315497,400Has one confirmed exoplanet[101]
Wolf 359100,180.8Fifth-nearest star system to the Solar System. Has one unconfirmed exoplanet[93]
NN Serpentis red dwarf103,660[102]
CFBDSIR 1458+10 A104,350Brown dwarf
NY Virginis A105,050B-type subdwarf[103]
Gliese 1061105,746.4Red dwarfHas three confirmed exoplanets, two of them are in the habitable zone.[93]
LP 890-9106,580Has two confirmed exoplanets, one of them (LP 890-9c) is in the habitable zone.[104]
Proxima Centauri107,277This is the nearest neighbouring star to the Sun. Has 2 confirmed exoplanets and one disputed planet[105]
Luyten 726-8 B (UV Ceti)110,615The archetypal type of the flare stars, and the eight-nearest star system to the Solar System.[106]
NY Virginis B111,300[107]
TZ Arietis112,000Has one confirmed exoplanet[108]
Luyten 726-8 A (BL Ceti)114,790Luyten 726-8 A and B are the eight-nearest star system to the Solar System.[106]
YZ Ceti116,877.5Has three confirmed exoplanets[109]
LP 791-18 (TOI-736)118,270Has three confirmed exoplanets[110]
HR 858 B118,270[111]
UY Sextantis118,270B-type subdwarf[112]
Wolf 424 A118,270Red dwarf[100]
Kepler-42121,750Has three confirmed exoplanets[113]
EZ Aquarii A (Luyten 789-6 A)121,750[100]
HW Virginis B121,835[114]
Gliese 1151123,900Has one confirmed exoplanet[115]
Groombridge 34 B125,200[116]
Wolf 1069126,130Has one confirmed potentially habitable exoplanet[117]
HW Virginis A127,404.6B-type subdwarf[114]
Gliese 3323129,539.5Red dwarfHas two confirmed exoplanets[118]
Barnard's Star130,100The star with the highest proper motion,[119] and the second-nearest star system to the Solar system.[93]
LHS 3844 (Batsũ̀)131,500Has one confirmed exoplanet[120]
Ross 248132,200Tenth-nearest star system to the Solar System.[98]
Gliese 1128132,200[121]
Alpha Mensae B132,200[122]
Ross 128136,844Has one confirmed potentially habitable exoplanet[123]
LTT 1445 C137,050[124]
Ross 154139,140Ninth-nearest star system to our Solar System.[93]
Gliese 1062141,000Other sources cites 258,800 km (0.372 R☉)[125] and 285,935 km (0.411 R☉)[126][127]
Kepler-70141,225B-type subdwarfHas two unconfirmed exoplanets, which may be the hottest exoplanets known.[128]
RR Caeli red dwarf141,225Red dwarf
Gliese 1214141,922Has a confirmed exoplanet[93]
Gliese 754142,618.5[129]
LHS 1140142,618.5Has two confirmed exoplanets[93]
EZ Aquarii B (Luyten 789-6 B)146,100[130]
Gliese 1132149,575Has two confirmed exoplanets[93]
LSR J1835+3259150,133Brown dwarf[131]
CT Chamaeleontis B157,282.4
V391 Pegasi160,000B-type subdwarfHas one exoplanet candidate[132]
Kepler-1649161,400Red dwarfHas two confirmed exoplanets[133]
LTT 1445 B164,185[124]
CM Draconis B166,700[134]
Kepler-429167,000B-type subdwarfHas three exoplanet candidates[135]
Ross 695167,000Red dwarf[136]
Kruger 60 B167,000[137]
2M1207 A173,925Brown dwarfHas one confirmed exoplanet[138]
CM Draconis A176,000Red dwarf[139]
DG Canum Venaticorum176,000[140]
AM Herculis red dwarf180,882[141]
Z Andromedae B184,530.63White dwarfLargest known white dwarf. Part of a symbiotic binary star system containing a red giant and a white dwarf.[142]
55 Cancri B186,447.5Red dwarf[143]
LTT 1445 A188,500Red dwarfHas three confirmed exoplanets, one of them is in the habitable zone[144]
Struve 2398 B189,925[98]
Gliese 105 B (268 G. Ceti B)193,405[98]
LHS 475194,030.5Has one confirmed exoplanet[145]
HR 7703 B194,800[137]
Mu Cassiopeiae Ab201,750[146]
Kapteyn's Star202,448.7This is the closest halo star to the Sun.[147]
Stein 2051 A203,150[148]
HN Librae208,000Has one confirmed planet and one unconfirmed[149]
Gliese 402208,700
L 98-59210,800Has four confirmed exoplanets and one unconfirmed[150]
Gliese 581215,650Has three confirmed exoplanets[93]
40 Eridani C215,650[151]
Wolf 1061221,900Has three confirmed exoplanets[93]
Gliese 3929222,600Has two confirmed exoplanets[152]
Xi Ursae Majoris Ab222,600[153]
YZ Canis Minoris225,400[108]
Wolf 437 (Gar)228,190Has one confirmed exoplanet[154]
Gliese 1229,580[155]
Wolf 1130 A229,580[156]
Gliese 357231,650Has three confirmed exoplanets[157]
Gliese 667 C231,650Has two confirmed exoplanets[93]
Kepler-47 B235,150There are three exoplanets orbiting Kepler-47 B and its companion, Kepler-47 A, in a circumbinary orbit.[158][159]
Luyten's Star243,500Has two confirmed exoplanets and other two unconfirmed[160]
Kruger 60 A243,500[137]
Struve 2398 A246,300[93]
EV Lacertae250,500On 25 April 2008, a record-setting stellar flare was observed on its surface by NASA's Swift, that was thousands of times more powerful than any solar flare.[161][162]
Theta Cygni B250,500[163]
Gliese 251253,235Has one confirmed exoplanet[164]
DT Virginis B256,000[165]
AT Microscopii B257,400[166]
Regulus C257,400[167]
Gliese 876 (Ross 780)258,800Has four confirmed exoplanets[93]
LHS 6343 A259,495[51]
LTT 3780 (TOI-732)260,190Has two confirmed exoplanets[168]
TOI-270263,000Has three confirmed exoplanets[169]
Gliese 412 A264,400[98]
Groombridge 34 A267,800Has two confirmed exoplanets[93]
L 34-26270,000It hosts the exoplanet with the longest known orbital period, COCONUTS-2b, which takes about 1.1 million years to complete an orbit around its star.[170][171]
Teide 1270,240Brown dwarf[172][173]
Gliese 908271,323Red dwarf[136]
Gliese 1252272,000Has one confirmed exoplanet, an ultra-short-period planet with a daytime temperature measured at 1140 °C.[174][175]
HIP 79431 (Sharjah)272,000Has one confirmed exoplanet. Other sources cites radius of 307,500 km (0.442 R☉)[176] and 375,680 km (0.54 R☉)[177][178]
Lalande 21185273,500Sixth-nearest star system to the Solar System. Has two confirmed exoplanets and one unconfirmed[179]
LHS 6343 B274,100[51]
Gliese 22 B274,100[180]
Gliese 179278,300Has two confirmed exoplanets[118]
HIP 57050278,300Has two confirmed exoplanets[181]
KOI-4777278,300Has one confirmed exoplanet[182]
Gliese 163284,550Has five confirmed exoplanets[93]
AT Microscopii A285,250[166]
Gliese 588292,200[183]
Gliese 686292,200Has a confirmed exoplanet[184]
TOI 700292,200Has four confirmed exoplanets[185]
QS Virginis B292,404[29]
Gliese 180294,211.5Has two confirmed exoplanets[118]
AD Leonis294,500[186]
Gliese 408299,150[137]
Gliese 3634299,150Has a confirmed exoplanet[187]
Gliese 569 A299,150[188]
U Geminorum red dwarf299,150[22]
Gliese 436300,542Has a confirmed exoplanet[93]
Sigma Coronae Borealis C304,000[189]
HD 260655 (TOI-4599)305,400Has two confirmed exoplanets[190]
WR 93b306,108Wolf-Rayet[191]
Gliese 832307,500Red dwarfHas two exoplanets[93]
Gliese 877307,500[157]
Gliese 393310,212.5[118]
Tabby's Star B313,065[192]
Gliese 367 (Añañuca)317,935Has three confirmed exoplanets[193]
Gliese 849322,800Has two confirmed exoplanets[93]
K2-18 (EPIC 201912552)326,300Has two confirmed exoplanets[194]
Gliese 521327,000[195]
BAT99-123327,000Wolf-Rayet[196]
Lacaille 9352329,750Red dwarfHas two confirmed exoplanets and one unconfirmed[93]

Smallest stars by type

List of the smallest stars by star type
TypeStar nameRadius
Solar radii
(Sun = 1)		Radius
Jupiter radii
(Jupiter = 1)		Radius
Earth radii
(Earth = 1)		Radius
(km / mi)		DateNotesReferences
Red dwarfEBLM J0555-57Ab0.0840.849.4160,000 km (37,000 mi)2017The red dwarf stars are considered the smallest stars known, and representative of the smallest star possible.[55][56][57]
Brown dwarfWISEA 1810−10100.0670.6557.2946,840 km (29,110 mi)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.[48]
White dwarfHD 497980.00230.0230.251,600 km (990 mi)2021White 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.[14]
Neutron starRX J0720.4−31250.0000064683 – 0.00000773320.00006294 – 0.000075250.0007055 – 0.00084354.50+0.08
−0.09 – 5.38+0.13
−0.14		2012Neutron stars are stellar remnants produced when stars with around 9 solar masses or more explode in supernovae at the ends of their lives. 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.[1]

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 nameDateRadius
Solar radii
(Sun = 1)		Radius
Jupiter radii
(Jupiter = 1)		Radius
km
(mi)		Notes
EBLM J0555-57Ab2017-0.0840.8460,000 km (37,000 mi)This star has a size comparable to that of Saturn.[55][56][57]
2MASS J0523-14032013-20170.1021.0170,600 km (43,900 mi)Lowest mass main sequence star as in 2020.[77][58][197][66]
OGLE-TR-122B2005-20130.1171.1681,100 km (50,400 mi)[89][90][91]

Notes

References

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