List of smallest known stars

This is a list of the smallest known stars, brown dwarfs and stellar remnants, sorted by increasing size. The list is divided into sublists, and contain notable objects up to 350,000 km in radius, or 0.50 R☉, as well as all red dwarfs smaller than 0.1 R☉ and all neutron stars with accurately measured radii.

0 to 1,000 km

[edit]

Partial list containing stars up to 0.0014 R☉.

Star name Star radius, kilometres Star class Notes References
SGR J1935+2154 4.35+1.95
−1.35 		Magnetar [1]
RX J0720.4−3125 4.50+0.08
−0.09 – 5.38+0.13
−0.14 		Neutron star [2]
LMC X-4 8.301±0.2 Pulsar [3]
Hercules X-1 8.10±0.41 [3]
Centaurus X-3 9.178±0.130 [3]
Vela X-1 9.56±0.0 [3]
HESS J1731-347 10.40+0.86
−0.78 		Neutron star Lightest neutron star ever discovered, at a mass of 0.77 M☉.[4][5] [4]
PSR J0348+0432 A 11–15 Pulsar Has a white dwarf companion. [6]
PSR J0437−4715 >11.1 Most stable known natural clock. [7]
GW170817 A 11.9±0.4 [3]
GW170817 B 11.9±0.4 [3]
PSR J1906+0746 11.99–12.85 [8]
RX J1856.5−3754 12.1+1.3
−1.6 		Neutron star Nearest known neutron star. [7]
PSR J2043+1711 12.13–12.96 Pulsar [8]
PSR J1933-6211 12.15–12.98 [8]
PSR J0952–0607 A 12.245+0.685
−0.315 		Most massive neutron star so far discovered. [9]
4U 1702−429 12.4±0.4 Neutron star [10]
Vela pulsar 12.52–13.30 Pulsar [8]
PSR J1614−2230 13±2 [3]
PSR J0348+0432 13±2 [3]
PSR J0740+6620 13.7+2.6
−1.5 		[11]
ZTF J1406+1422 A 14 Neutron star Has a substellar companion orbiting it closely. [12]

1,000 to 50,000 km

[edit]

Partial list containing stars from 0.0014 to 0.0718 R☉.

Star name Star radius, kilometres Star radius, R☉ Star class Notes References
ZTF J1901+1458 2,140 0.003076+0.000230
−0.000331 		White dwarf The most massive white dwarf so far discovered, around 1.3 times more massive than the Sun, close to the mass limit of any white dwarf (the Chandrasekhar limit),[13] and is also a candidate white dwarf pulsar.[14] [13]
RE J0317-853 2,200 0.0032 Also among the most massive white dwarfs. [15]
WD1 2,230 0.00321+0.00040
−0.00036 		An ultramassive white dwarf ejected from the Hyades. At a mass of 1.317 M☉, it is possibly the most massive known white dwarf consistent with single-star evolution.[a] [16]
T Coronae Borealis 3,130 0.0045 Expected to become a nova in the near future, its apparent magnitude may increase up to 2.0.[17] [18]
Janus 3,400 0.004887+0.0010
−0.00086 		A white dwarf with a side of hydrogen and another side of helium. [19]
Wolf 1130 B 3,500 0.005 Nearest candidate for a supernova, a type Ia supernova.[20] [20]
HD 49798 B 3,580 0.00515 [21]
BPM 37093 4,060 0.00583±0.00008 [22]
IK Pegasi B 4,200 0.006 [23]
U Geminorum A 4,410 0.00634±0.00016 [24]
WD 2317+1830 5,517 0.00793±0.00021 [25]
BW Sculptoris 5,570 0.00800+0.00014
−0.00011 		[24]
Sirius B 5,634 0.008098±0.000046 Historically first discovered white dwarf, and the closest example to Earth. [26]
GRW +70 8247
(Gliese 742) 		5,960 0.0086 [27][b]
Gamma Cassiopeiae Ab 6,000 0.00862+0.00009
−0.00046 		[28]
AN Ursae Majoris 6,300 0.0091 [29]
Pi1 Gruis C 6,300 0.009±0.002 White dwarf or K/F dwarf Status has been inferred only from its mass of 0.86+0.22
−0.20 M☉. If a K-type or F-type dwarf, its radius is expected to be 0.80+0.34
−0.17 R☉. 		[30]
Gliese 915 6,750 0.0097±0.0001 White dwarf [31]
LP 658-2 6,778 0.0097 [32]
BZ Ursae Majoris A 6,880 0.00989 [33]
AE Aquarii A 7,000 0.01 First discovered white dwarf pulsar. [34]
AR Scorpii A 7,000 0.01 A white dwarf pulsar. It is often mistaken as the first discovered white dwarf pulsar. [35]
QS Virginis A 6,960 0.010±0.001 [36]
YZ Leonis Minoris 7,000 0.01 [37]
GW Librae 7,170 0.0103+0.0015
−0.0010 		[24]
WZ Sagittae 7,300 0.0105±0.0013 [24]
MY Apodis 7,650 0.011±0.001 [38]
OY Carinae A 7,650 0.011 [39]
TMTS J052610.43+593445.1 A 7,650 0.011 [40]
G 99-47 7,650 0.011 [32]
EX Hydrae 7,650 0.011 [41]
RX Andromedae 7,790 0.0112+0.0012
−0.0008 		[24]
van Maanen 2 7,860 0.01129 ± 0.00066 Third-closest white dwarf. [42]
Stein 2051 B 7,930 0.0114±0.0004 [43]
G 107-70 B 8,224 0.0118 [32]
Ross 548
(ZZ Ceti) 		8,209 0.0118±0.0002 [44]
39 Ceti B
(AY Ceti B) 		8,350 0.012 [45]
WD 1054–226 8,350 0.012±0.001 [46]
Gliese 440 8,550 0.0123 ± 0.0009 Fourth-closest white dwarf. [42]
Procyon B 8,585 0.01234±0.00032 Second-closest white dwarf. [47]
GD 165 A 8,627 0.0124±0.0003 [32]
Epsilon2 Arae C 8,627 0.0124±0.0003 [31]
WD 0806−661
(Maru) 		8,860 0.0127 Has one confirmed exoplanet. [32]
SW Ursae Majoris 8,975 0.0129+0.0009
−0.0010 		[24]
Epsilon Reticuli B 8,975–9,809 0.0129–0.0141 [48]
G 29-38 8,975 0.0129 [42]
AM Herculis A 9,040 0.013+0.0017
−0.0014 		[24]
40 Eridani B 9,100 0.01308±0.0002 Fifth-closest white dwarf. [49]
TY Coronae Borealis 9,110 0.0131±0.0014 [31]
HD 147513 B 9,144 0.0131 [42]
GD 358
(V777 Herculis) 		9,170 0.0132 [50]
Wolf 489 9,170 0.0132 [32]
GALEX J2339–0424 9,253 0.0133±0.0008 [51]
G 107-70 A 9,412 0.0135 [32]
Wolf 1346 9,670 0.0139±0.0006 [31]
WD 1032+011 A 10,230 0.0147±0.0013 [52]
Gliese 318 10,300 0.0148 [42]
RR Caeli A 10,909 0.01568±0.00009 Has two exoplanets. [53]
HL Tau 76 11,270 0.0162 [54]
PG 1159-035 16,140 or 17,670 0.0232 or 0.0254±0.005 PG 1159 star
(Pre-degenerate) 		PG 1159 stars are pre-white dwarfs. [55]
WD 2226-210 17,390 0.025±0.001 White dwarf Located in Helix Nebula [56]
WD 0032−317 A 18,510 0.0266±0.0012 [57]
Feige 55 19,460 0.027965 [58][c]
ZTF J1406+1422 B 20,200 0.029 Brown dwarf A highly-irradiated brown dwarf with an orbital period of 62 minutes and a dayside surface temperature of 10,462 K,[12] comparable to A-type stars such as Vega and Sirius. [12]
KPD 0005+5106 41,000 0.059+0.031
−0.018 		Pre-white dwarf Has one unconfirmed exoplanet. [59]
AG Pegasi B 41,700 0.06 White dwarf In a symbiotic binary with AG Peg A, has underwent many mass transfer events, varying in radius, luminosity and temperature. [60]
Regulus Ab 42,440 0.061±0.011 Pre-white dwarf [61]
PSR J0348+0432 B 45,220 0.065±0.005 White dwarf Orbiting a pulsar. [62]
TMTS J052610.43+593445.1 B 45,990 0.0661±0.0054 Subdwarf B star Smallest known hydrogen-burning star. [40]
WISEA 1810−1010 46,610 0.067+0.032
−0.02 		Brown dwarf [63]

50,000 to 125,000 km

[edit]

Partial list containing stars from 0.0718 to 0.18 R☉.

Star name Star radius, kilometres Star radius, R☉ Star class Notes References
SCR 1845−6357 B 50,000 0.0719±0.01 Brown dwarf [64]
DENIS 0255−4700 53,986 0.0776±0.0060 Faintest brown dwarf with a measured visual magnitude. [65]
BE Ursae Majoris A 54,300 0.078±0.004 Subdwarf O star [66]
LP 40-365 54,300 0.078+0.040
−0.020 		White dwarf A white dwarf that might have formed in a type Iax supernova. [67]
SDSS J1007+1930 54,500 ~0.078 Brown dwarf Potential member of the Regulus system, which could be one of the most widely-separated stellar systems. This brown dwarf is at 12.6 light-years from Regulus. [68][d]
WD 0032−317 B 54,890 0.0789+0.0085
−0.0083 		A highly-irradiated brown dwarf with a dayside temperature hotter than the surface of Sun. Its dayside temperature measures 7,900 K (7,630 °C), while its nightside is much cooler, at 1,970 K (1,700 °C). [57]
WISE 1534–1043 55,300 0.0794 ± 0.016 This object has a very fast and unusual transverse velocity, and is believed to be very old and metal-poor to explain such unusual velocity. [69]
Epsilon Indi Ba 55,700 0.08–0.081 [70]
WISE J0623-0456 55,800 or 79,400 0.0802+0.0175
−0.0134[71] or 0.1141±0.0144[72]
LHS 6343 C 56,340 0.08098±0.00442 [73]
Epsilon Indi Bb 57,050 0.082–0.083 [70]
54 Piscium B 57,900 0.0832±0.0021 [71]
Gliese 229 Ba 57,910 0.08324+0.00514
−0.01233 		[74]
Wolf 1130 C 58,600 0.0843 [75]
EBLM J0555-57Ab 58,720 0.0844+0.0131
−0.006 		Red dwarf Smallest known red dwarf. [76]
Scholz's Star B 58,770 0.08447+0.0015
−0.0016 		Brown dwarf A nearby star that passed trough the Solar System's Oort cloud 80,000 years ago. [77]
EPIC 201702477b [fr] 59,340 0.0853±0.0041 [78]
GJ 1245 C 60,530 0.087±0.004 Red dwarf [79]
Gliese 229 Bb 60,770 0.0874+0.0123
−0.0051 		Brown dwarf [74]
SSSPM J0829-1309 61,220 0.088±0.003 Red dwarf An L2 dwarf that is fusing hydrogen. SSSPM J0829-1309 is one of the least luminous and massive hydrogen-fusing stars, and is smaller than Jupiter. [80][81]
HD 63754 B 61,500–67,900 0.0884–0.0976 Brown dwarf Among the most massive brown dwarfs. [82]
HD 72946 B 61,500 0.0884 [83]
Gliese 570 D 63,629 0.09146+0.0051
−0.0041 		[71]
2MASS 0243−2453 64,004–73,744 0.092–0.106 [84]
2MASS J0348−6022 64,700 0.093+0.016
−0.010 		[85]
WISE 0146+4234 A 65,270 0.0938+0.0024
−0.0026 		[86]
Kelu-1 B 65,400 to 72,500 0.094 to 0.104 [87][e]
SCR 1845−6357 A 65,470 0.0941±0.0039 Red dwarf [65]
WISE 0146+4234 B 65,670 0.09944+0.0035
−0.0015 		Brown dwarf [86]
SDSS J1416+1348 A 65,700 0.0945±0.0082 [88]
Kelu-1 A 66,000 to 74,900 0.095 to 0.108 [87][f]
47 Ophiuchi C 66,500 0.0956±0.001 [72]
2MASS 0937+2931 67,200 0.0966±0.0164 [89]
2MASS J1047+21 67,200 0.0966±0.0164 [89]
CoRoT-15b 67,200 0.0966±0.0123 [78]
SDSS J1416+1348 B 67,200 0.0966±0.0164 [88]
WISE 0359−5401 67,200 0.0966±0.0021 [90]
TVLM 513-46546 67,480—75,830 0.097–0.109 Has one confirmed exoplanet. [91]
CWISEP J1935-1546 67,900 0.0976±0.0143 [92]
Eta Coronae Borealis C 67,900 0.0976±0.0031 [72]
WISE 2150−7520 B 67,900 0.0976±0.0164 [93]
LHS 1070 C 68,180 0.098 Certainly a brown dwarf based on its mass.[94] [95]
WASP-30B 68,670 0.0987±0.0031 [78]
WASP-128B 68,670 0.0987±0.0021 [78]
HD 33632 Ab 69,350 0.0997 [96]
2MASS J0407+1546 69,570 0.100+0.024
−0.008 		[85]
2MASS J1219+3128 69,570 0.100+0.027
−0.013 		[85]
HD 114762 B 69,570 0.100 Red dwarf [97]
R Aquarii B >70,000 >0.1 White dwarf Makes a symbiotic binary with its companion R Aquarii A, a red giant. [98]
EBLM J0954-23 70,266 0.101±0.017 Red dwarf [76]
KOI-189 B 70,474–71,796 0.1013–0.1032 [99]
Scholz's Star A 70,900 0.1019+0.0006
−0.0007 		A nearby star that passed trough the Solar System's Oort cloud 80,000 years ago. [77]
Gliese 569 Bb 70,960 0.102±0.020 Brown dwarf First brown dwarf ever discovered, together with its companion Gliese 569 Ba, which were thought to be a single astronomical body at the time. [100]
Luhman 16 A 70,960 0.102±0.005 Nearest brown dwarfs to Earth. [101]
Luhman 16 B 70,960 0.102±0.005 [101]
HD 28736 B 71,280 0.1025±0.0024 [102]
15 Sagittae B 71,492 0.1028±0.0411 [103]
GD 165 B 71,492 0.1028±0.008 [89]
LHS 1070 B 72,350 0.104 Likely a brown dwarf based on its mass.[94] [95]
WD 1032+011 B 73,190 0.1052±0.01 A brown dwarf orbiting a white dwarf with an extremely low orbital period of 0.09 days (2.2 hours), both being tidally locked to each other.[52] [52]
WISE 2150-7520 A 73,640 0.1058±0.0062 [93]
BW Sculptoris B 73,640 0.1058±0.0051 [104]
Ross 614 B 74,100 ~0.107 Red dwarf [105]
LHS 2924 74,440 0.107 Was the smallest known star at its discovery. [106]
DENIS J1048−3956 75,140 0.108 [107]
VZ Piscium B 75,800 0.1089±0.0041 Also called NLTT 56936 B[108] or HIP 115819 B.[109] [72]
WISE 0607+2429 75,800 0.1089±0.0175 Brown dwarf [72]
ESO 207-61 76,500 0.11±0.02 One of the first brown dwarfs to be identified.[110] [72]
Kepler-39b 76,500 0.11±0.0031 Kepler-39 rotates rapidly with a rotation period of 1.6 hours and hence has an oblate shape, with its equator length being 22% larger than the poles.[111] [78]
CoRoT-3b 77,220 0.111±0.0051 [78]
TOI-2119 B 77,220 0.111±0.0031 [112]
2MASS 1237+6526 77,930 0.112±0.016 Has one unconfirmed exoplanet. [72]
LHS 2065 78,610 0.113±0.006 Red dwarf [113]
WISE J004945.61+215120.0 80,100 0.1151±0.0123 Brown dwarf [72]
2MASS J0523−1403 80,500 0.1157±0.0065 Red dwarf [65]
KELT-1B 80,770 0.1161±0.0031 Brown dwarf [78]
LHS 292 80,980 0.1164±0.0044 Red dwarf Not to be confused with LHS 2924 (see above) [65]
WISE 1405+5534 82,220 0.1182±0.0021 Brown dwarf [114]
vB 10 82,300 0.1183+0.0059
−0.0057 		Red dwarf [113]
2M1540 82,790 0.119 [115][g]
EI Cancri B 82,790 0.119±0.021 [116]
Gliese 569 Ba 82,790 0.119±0.020 Brown dwarf First brown dwarf ever discovered, together with its companion Gliese 569 Bb, which were thought to be a single astronomical body at the time. [100]
TRAPPIST-1 82,927 0.1192±0.0013 Red dwarf Hosts a planetary system with seven confirmed planets. [117]
OGLE-TR-122B 83,480 0.120+0.024
−0.013 		Was the smallest known star from 2005 to 2013. [118]
Teegarden's Star 83,480 0.120±0.012 Has three confirmed exoplanets. [119]
G 196-3 B 84,400 0.1213±0.00719 Brown dwarf [72]
Königstuhl 1 B 84,400 0.1213±0.0021 [72]
vB 8 84,458 0.1214+0.006
−0.0057 		Red dwarf [113]
LS IV-14 116 84,900 0.122 Subdwarf B star [120]
SPECULOOS-3 85,600 0.123±0.0022 Red dwarf Has one confirmed exoplanet. [121]
2MASS 0122-2439 B 85,800 0.1233±0.021 [122]
DX Cancri 85,920 0.1235±0.0006 [65]
LHS 2090 86,960 0.125±0.005 [65]
VHS J1256–1257b 87,200 0.125 Brown dwarf [123]
LHS 288 87,380 0.1256±0.0042 Red dwarf [65]
Gliese 412 B 87,797 0.1262±0.0054 [124]
OY Carinae B 88,350 0.127 [125]
AZ Cancri 88,630 0.1274±0.0195 [72]
AS Leonis Minoris B 90,400 – 355,000 0.13–0.51 White dwarf or Subdwarf B star AS Leonis Minoris is an eclipsing binary system made up of a luminous red giant (45–170 R☉) and a hot companion (AS LMi B). It has the longest period of any known eclipsing binary at 69 years. [126]
GJ 1245 B 90,400 0.13±0.007 Red dwarf [127]
Gliese 623 B 92,350 0.133 ± 0.008 [128][h]
Gliese 105 C 92,459 0.1329+0.0057
−0.0055 		[129]
Teide 1 93,711 0.1347+0.0123
−0.0077 		Brown dwarf First brown dwarf to be confirmed. [130]
EI Cancri A 94,620 0.136±0.020 Red dwarf [116]
Alpha Trianguli B 97,400 0.14 [131]
LHS 1070 A 97,400 0.14 [95]
HD 149382 99,485 0.143 Subdwarf B star [132]
EZ Aquarii A (Luyten 789-6 A) 99,485 0.143±0.022 Red dwarf [127]
EZ Aquarii B (Luyten 789-6 B) 99,485 0.143±0.022 [127]
Wolf 359 100,180 0.144±0.004 Fifth-nearest star system to Earth. [113]
DENIS-P J1058.7−1548 101,500 0.1459±0.001 Brown dwarf [72]
GJ 1245 A 101,570 0.146±0.007 Red dwarf [79]
LP 944-20 102,900 0.1479±0.0144 Brown dwarf Among the brightest brown dwarfs. [72]
Wolf 424 A 104,350 0.150±0.019 Red dwarf [116]
NY Virginis A 105,000 0.151±0.001 Subdwarf B star [133]
EX Hydrae B 105,300 0.1513 Red dwarf [41]
GJ 1061 105,750 0.152±0.007 Has three confirmed exoplanets. [113]
Wolf 424 B 106,440 0.153±0.019 [116]
Proxima Centauri 107,280 0.1542±0.0045 The nearest extrasolar star. Has one confirmed planet, one candidate, and one disputed [134]
85 Pegasi Bb 107,830 0.155 [135]
Gliese 65 B (Luyten 726-8 B) 110,620 0.159±0.006 The Gliese 65 system may host a Neptune-mass planet. [136]
NY Virginis B 111,310 0.16 [137]
GL Virginis 111,520 0.1603±0.0053 [138]
TZ Arietis (GJ 9066) 112,010 0.161±0.014 Has one confirmed exoplanet. [127]
2M1510 Aa 112,600 0.16185 Brown dwarf The system has a candidate planet (2M1510 b) that orbits on a polar orbit around 2M1510AB, making this planet the first planet discovered orbiting polar around a binary system. [139][140][141][142]
2M1510 Ab 112,600 0.16185
Gliese 65 A (Luyten 726-8 A) 114,790 0.165±0.006 Red dwarf The Gliese 65 system may host a Neptune-mass planet. [136]
Kepler-451 B 116,880 0.168±0.001 [143]
YZ Ceti 116,880 0.168±0.009 Has three confirmed exoplanets. [144]
HR 858 B 118,000 0.17±0.04 [145]
LP 791-18 118,000 0.17±0.018 Has three confirmed exoplanets. [146]
UY Sextantis 118,000 0.17±0.01 Subdwarf B star [147]
Z Andromedae B 118,000 to 250,000 0.17±0.03 to 0.36±0.06 White dwarf Makes a symbiotic binary with its companion Z Andromedae A, a red giant. [148]
HIP 81208 Cb 122,100 0.175 ± 0.009 Brown dwarf [149]
AB Doradus C 124,000 0.178 Red dwarf Among the least massive stars confirmed. [150][i]
Gliese 22 B 124,530 0.179±0.009 [79]

125,000 to 200,000 km

[edit]

Partial list containing stars from 0.18 to 0.287 R☉.

Star name Star radius, kilometres Star radius, R☉ Star class Notes References
Groombridge 34 B
(Gliese 15 B) 		125,230 0.18±0.03 Red dwarf [151]
HW Virginis A 127,310 0.183±0.026 Subdwarf B star [152]
HU Delphini A 128,010 0.184±0.004 Red dwarf [127]
Gliese 29 B 129,400 0.186±0.014 [153]
GJ 3323 129,540 0.1862±0.0059 Has two confrirmed exoplanets. [138]
Barnard's Star 130,100 0.187±0.001 Second-nearest star system to the Solar System. The star with the highest proper motion. Has three confirmed exoplanets. [113]
Alpha Mensae B 132,180 0.19±0.01 [154]
GJ 1128 132,000 0.190±0.014 [127]
Ross 248
(HH Andromedae) 		132,180 0.19 [124]
Ross 128 (Gliese 447) 137,750 0.198±0.007 Has one confirmed exoplanet. [113]
Ross 154 (V1216 Sagittarii) 139,140 0.200±0.008 [113]
GJ 1062 140,500 0.202±0.012 Red subdwarf Another size estimates include 0.372±0.076 R☉[155] and 0.411±0.051 R☉.[156] [157]
Kepler-70 141,200 0.203±0.007 Subdwarf B star Has two unconfirmed exoplanets. [158]
Kepler-451 A 141,200 0.203±0.001 Possibly has two exoplanets. [143]
RR Caeli B 141,200—149,600 (0.203–0.215) ± 0.015 Red dwarf Has two exoplanets. [159]
GJ 1214 141,920 0.204+0.0085
−0.0084 		Has one confirmed exoplanet. [113]
LHS 1140 142,600 0.205±0.008 Has two confirmed exoplanets. [113]
Krüger 60 B 145,400 0.209±0.017 [116]
Ross 508 147,000 0.2113±0.0063 Has one confirmed exoplanet. [160]
GJ 1132 149,580 0.215±0.009 [113]
QY Aurigae A 151,660 0.218±0.021 [127]
QY Aurigae B 151,660 0.218±0.021 [127]
Kepler-16 B 157,388 0.22623±0.00059 Has one confirmed exoplanet. [161]
V391 Pegasi 160,000 0.23 Subdwarf B star Has one unconfirmed exoplanet. [162]
Gliese 777 B 160,710 0.231±0.025 Red dwarf [127]
Kepler-1649 161,190 0.2317±0.0049 Has two confirmed exoplanets. [163]
Eta Telescopii B 163,000 0.234±0.003 Brown dwarf [164]
CM Draconis B 165,100 0.23732±0.00014 Red dwarf [165]
Ross 47 165,580 0.238±0.009 [113]
Kepler-429 166,970 0.24 Subdwarf B star Has three unconfirmed exoplanets. [166]
2M1207 A 172,000 0.247+0.041
−0.082 		Brown dwarf [167]
PZ Telescopii B 173,900 0.25+0.03
−0.04 		[168]
CM Draconis A 174,710 0.25113±0.00016 Red dwarf [165]
DG Canum Venaticorum A 176,010 0.253 [155]
Ross 614 A 176,710 0.254±0.028 [155]
Gliese 625 177,400 0.255±0.034 [169]
Gliese 12 182,060 0.2617+0.0058
−0.0070 		Has one confirmed exoplanet. [170]
HIP 79098 B 185,800 0.2672±0.0617 Brown dwarf [122]
BX Trianguli B 188,000 0.27±0.01 Red dwarf Has one confirmed exoplanet. [171]
V846 Arae B 188,000 0.27±0.04 Subdwarf O star [172]
Mu Herculis C 189,930 0.273±0.032 Red dwarf [127]
40 Eridani C 190,620 0.274±0.011 [124]
Struve 2398 B 194,800 0.280±0.005 [173]
Gliese 402 197,580 0.284±0.011 [113]
GJ 3991 197,580 0.286±0.011 [113]

200,000 to 275,000 km

[edit]

Partial list containing stars from 0.29 to 0.395 solar radii.

Star name Star radius, kilometres Star radius, R☉ Star class Notes References
Gliese 105 B 201,060 0.289+0.012
−0.011 		Red dwarf [129]
CoRoT-7 B 201,800 0.29 [174]
Mu Cassiopeiae Ab 201,800 0.29 [175]
AP Columbae 202,400 0.291±0.009 The nearest pre-main sequence star to Earth. [153]
Kapteyn's Star (VZ Pictoris) 202,400 0.291±0.025 Red subdwarf Closest halo star to the Sun. Previously believed to host an ancient planetary system with potential habitable planets. [176]
Stein 2051 A 203,100 0.292±0.031 Red dwarf [169]
HN Librae 208,000 0.299±0.009 Has one confirmed exoplanet. [177]
3 Puppis B 210,000 0.3 Hot subdwarf This star is loosing mass to the blue supergiant 3 Puppis A, this mass transfer generates a disk of circumstellar dust around the supergiant, which is unusual for an A-type star. [178]
LS Muscae B ~210,000 0.3±0.1 Subdwarf O star [172]
Krüger 60 A 209,400 0.301±0.015 Red dwarf [116]
Gliese 581 210,100 0.302±0.005 Has three confirmed exoplanets. [179]
L 98-59 210,800 0.303+0.026
−0.023 		Has four confirmed exoplanets and one unconfirmed. [180]
EQ Pegasi B 210,800 0.303±0.013 [124]
Luyten's Star (Gliese 273) 221,930 0.319±0.004 Has two confirmed exoplanets and two unconfirmed. [113]
Wolf 1061 221,930 0.319±0.007 Has three confirmed exoplanets. [113]
GJ 3929 223,000 0.32±0.01 Has two confrirmed exoplanets. [181]
Xi Ursae Majoris Ab 223,000 0.32 [131]
Gliese 486 228,190 0.328±0.011 Has one confirmed exoplanet. [182]
YZ Canis Minoris 228,190 0.328±0.013 [113]
LHS 1678 228,890 0.329±0.01 Has three confirmed exoplanets. [183]
Regulus C 231,000 0.332±0.023 [153]
AM Herculis B 230,000 0.33 [184]
Wolf 1130 A 230,000 0.33 Nearest candidate for a supernova, a type Ia supernova.[20] [185]
EV Lacertae 230,280 0.331±0.013 On 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.[186] [113]
Gliese 357 231,670 0.333 Has three confirmed exoplanets. [155]
Gliese 667 C 234,450 0.337±0.014 Has two confirmed exoplanets. [113]
Aldebaran B 241,410 0.347±0.034 [132]
Struve 2398 A (Gliese 725 A) 244,200 0.351±0.003 Has one confirmed exoplanet. [173]
Gliese 251 253,230 0.364±0.001 [138]
Ross 458 A 256,020 0.368±0.031 Has one confirmed exoplanet. [169]
2MASS 0122–2439 A 257,000 0.369 ± 0.048 [187]
Furuhjelm 46 B 257,000 0.37±0.07 [155]
Furuhjelm 46 A 257,000 0.37±0.07 [155]
Innes' star 258,100 0.371±0.012 [153]
Gliese 876
(IL Aquarii) 		258,800 0.372±0.004 Has four confirmed exoplanets. First red dwarf known to host exoplanets. [113]
LHS 6343 A 259,500 0.373±0.005 [188]
LTT 3780 260,190 0.374±0.011 Has two confirmed exoplanets. [189]
Gliese 22 C 261,580 0.376±0.018 [79]
TOI-270 262,970 0.378±0.011 [190]
Gliese 1 263,700 0.379±0.002 [191]
13 Ceti Ab 264,000 0.38 [131]
GQ Lupi B 264,000 0.38±0.072 Brown dwarf [122]
Groombridge 34 A (Gliese 15 A) 267,840 0.385±0.002 Red dwarf [113]
Gliese 412 A 272,710 0.398±0.009 [138]
Lalande 21185 272,710 0.392±0.004 [113]
Gliese 22 B 274,110 0.394 [192]
LHS 6343 B 274,110 0.394±0.012 [188]

275,000 to 350,000 km

[edit]

Partial list containing stars from 0.395 to 0.5 solar radii.

Star name Star radius, kilometres Star radius, R☉ Star class Notes References
Gliese 570 C 277,300 0.399 ± 0.028 Red dwarf [128][j]
Asellus Primus B (Theta Boötis B) 279,180 0.4013±0.012 [138]
GJ 3293 281,100 0.404±0.027 [193]
Gliese 623 A 280,900 0.404 ± 0.024 [128][k]
Gliese 908 (Lalande 46650) 284,540 0.409±0.023 [157]
EQ Pegasi A 284,540 0.409±0.016 Has one confirmed exoplanet. [124]
Gliese 163 284,540 0.409+0.017
−0.016 		[113]
SDSS J001820.5−093939.2 285,930 0.411+0.090
−0.011 		F-type star Among the most metal-poor stars. [194]
Gliese 806 288,300 0.4144±0.0038 Red dwarf Has three confirmed exoplanets. [195]
Gliese 687 291,290 0.4187+0.0066
−0.0063 		[113]
QS Virginis B 292,000 0.42±0.02 [36]
TOI-700 292,000 0.420±0.031 [196]
Gliese 180 294,210 0.4229±0.0047 Has two confirmed exoplanets and one unconfirmed. [138]
AD Leonis 294,490 0.4233±0.0057 [197]
Gliese 686 297,060 0.427±0.013 [198]
GJ 3634 300,000 0.43±0.03 Has one confirmed exoplanet. [199]
Iota Ursae Majoris B 300,000 0.43 [200]
U Geminorum B 300,000 0.43±0.06 [201]
Gliese 436 300,540 0.432±0.011 Has one confirmed exoplanet. [113]
Gliese 393 300,540 0.432±0.025 [157]
Sigma Coronae Borealis C 304,020 0.437±0.020 [124]
Kappa1 Apodis B 306,000 0.44±0.06 Subdwarf O star [172]
WR 93b 306,000 0.44 Wolf-Rayet [202]
Gliese 832 307,500 0.442±0.018 Red dwarf [113]
Alpha Caeli B 313,000 0.45 [200]
Gliese 367 (Anañuca) 317,930 0.457±0.013 Has three confirmed exoplanets. [203]
Gliese 588 320,000 0.46±0.019 [113]
Iota Ursae Majoris C 320,000 0.46 [200]
Gliese 849 322,800 0.464±0.018 [113]
BAT99-123 (Brey 93) 327,000 0.47 Wolf-Rayet [204]
Gliese 176 329,760 0.474±0.015 Red dwarf [113]
Lacaille 9352 329,760 0.474±0.008 [113]
Tau Boötis B 333,900 0.48±0.05 [205]
Gliese 752 A 334,630 0.481±0.014 [198]
UScoCTIO 108 A 336,720 0.484 Brown dwarf [206][l]
Gliese 526 338,810 0.487±0.008 Red dwarf [113]
UX Ursae Majoris B 345,070–484,900 0.496–0.697 [207]
Theta Persei Ab 346,500 0.498±0.017 [124]
GJ 3470 347,150 0.499±0.021 [113]
Gliese 22 A ~350,000 ~0.5 [208]
Kappa Reticuli B 347,900 0.50 [209]
TOI-2119 347,900 0.500±0.015 [112]

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 References
Red dwarf EBLM J0555-57Ab 0.084 0.84 9.41 60,000 km (37,000 mi) 2017 The red dwarf stars are considered the smallest stars known, and representative of the smallest star possible. [210][211][212]
Brown dwarf ZTF J1406+1422 B 0.029 0.282 3.16 20,200 kilometres (12,600 mi) 2022 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. [12]
White dwarf ZTF J1901+1458 0.0031 0.030 0.34 2,140 km (1,330 mi) 2021 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 RX J0720.4−3125 0.0000064683 – 0.0000077332 0.00006294 – 0.00007525 0.0007055 – 0.0008435 4.50+0.08
−0.09 – 5.38+0.13
−0.14 		2012 Neutron 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. [2]

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 60,000 km (37,000 mi) This star has a size comparable to that of Saturn. [210][211][212]
2MASS J0523-1403 2013-2017 0.102 1.01 70,600 km (43,900 mi) Lowest mass main sequence star as of 2020. [213][80][214][89]
OGLE-TR-122B 2005-2013 0.117 1.16 81,100 km (50,400 mi) [215][216][118]

Notes

[edit]
  1. ^ "Single-star evolution" refer to a star that did not accreted mass from a companion (e.g. a nova) nor formed by the merger of two stars or white dwarfs (e.g. ZTF J1901).
  2. ^ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
    .
  3. ^ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
    .
  4. ^ Calculated using surface gravity and mass, via the equation log(R/R☉) = 2.22 + 0.5 • log(M/M☉) − 0.5 • log(g).
  5. ^ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
    .
  6. ^ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
  7. ^ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
    .
  8. ^ Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of 5,772 K:
  9. ^ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
    .
  10. ^ Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of 5772 K:
  11. ^ Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of 5,772 K:
  12. ^ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
    .


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