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
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 | ||
| RX J0720.4−3125 | 4.50+0.08 −0.09 – 5.38+0.13 −0.14 | Neutron star | ||
| LMC X-4 | 8.301±0.2 | Pulsar | ||
| Hercules X-1 | 8.10±0.41 | |||
| Centaurus X-3 | 9.178±0.130 | |||
| Vela X-1 | 9.56±0.0 | |||
| HESS J1731-347 | 10.40+0.86 −0.78 | Neutron star | Lightest neutron star ever discovered, at a mass of 0.77 M☉. | |
| PSR J0348+0432 A | 11–15 | Pulsar | Has a white dwarf companion. | |
| PSR J0437−4715 | >11.1 | Most stable known natural clock. | ||
| GW170817 A | 11.9±0.4 | |||
| GW170817 B | 11.9±0.4 | |||
| PSR J1906+0746 | 11.99–12.85 | |||
| RX J1856.5−3754 | 12.1+1.3 −1.6 | Neutron star | Nearest known neutron star. | |
| PSR J2043+1711 | 12.13–12.96 | Pulsar | ||
| PSR J1933-6211 | 12.15–12.98 | |||
| PSR J0952–0607 A | 12.245+0.685 −0.315 | Most massive neutron star so far discovered. | ||
| 4U 1702−429 | 12.4±0.4 | Neutron star | ||
| Vela pulsar | 12.52–13.30 | Pulsar | ||
| PSR J1614−2230 | 13±2 | |||
| PSR J0348+0432 | 13±2 | |||
| PSR J0740+6620 | 13.7+2.6 −1.5 | |||
| ZTF J1406+1422 A | 14 | Neutron star | Has a substellar companion orbiting it closely. |
1,000 to 50,000 km
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), and is also a candidate white dwarf pulsar. | |
| RE J0317-853 | 2,200 | 0.0032 | Also among the most massive white dwarfs. | ||
| 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. | ||
| 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. | ||
| Janus | 3,400 | 0.004887+0.0010 −0.00086 | A white dwarf with a side of hydrogen and another side of helium. | ||
| Wolf 1130 B | 3,500 | 0.005 | Nearest candidate for a supernova, a type Ia supernova. | ||
| HD 49798 B | 3,580 | 0.00515 | |||
| BPM 37093 | 4,060 | 0.00583±0.00008 | |||
| IK Pegasi B | 4,200 | 0.006 | |||
| U Geminorum A | 4,410 | 0.00634±0.00016 | |||
| WD 2317+1830 | 5,517 | 0.00793±0.00021 | |||
| BW Sculptoris | 5,570 | 0.00800+0.00014 −0.00011 | |||
| Sirius B | 5,634 | 0.008098±0.000046 | Nearest white dwarf | ||
| GRW +70 8247 (Gliese 742) | 5,960 | 0.0086 | |||
| Gamma Cassiopeiae Ab | 6,000 | 0.00862+0.00009 −0.00046 | |||
| AN Ursae Majoris | 6,300 | 0.0091 | |||
| Gliese 915 | 6,750 | 0.0097±0.0001 | |||
| LP 658-2 | 6,778 | 0.0097 | |||
| BZ Ursae Majoris A | 6,880 | 0.00989 | |||
| AE Aquarii A | 7,000 | 0.01 | First discovered white dwarf pulsar. | ||
| AR Scorpii A | 7,000 | 0.01 | A white dwarf pulsar. It is often mistaken as the first discovered white dwarf pulsar. | ||
| QS Virginis A | 6,960 | 0.010±0.001 | |||
| YZ Leonis Minoris | 7,000 | 0.01 | |||
| GW Librae | 7,170 | 0.0103+0.0015 −0.0010 | |||
| WZ Sagittae | 7,300 | 0.0105±0.0013 | |||
| MY Apodis | 7,650 | 0.011±0.001 | |||
| OY Carinae A | 7,650 | 0.011 | |||
| TMTS J0526+5934 A | 7,650 | 0.011 | |||
| G 99-47 | 7,650 | 0.011 | |||
| EX Hydrae | 7,650 | 0.011 | |||
| RX Andromedae | 7,790 | 0.0112+0.0012 −0.0008 | |||
| van Maanen 2 | 7,860 | 0.01129 ± 0.00066 | Third-closest white dwarf. | ||
| Stein 2051 B | 7,930 | 0.0114±0.0004 | |||
| G 107-70 B | 8,224 | 0.0118 | |||
| Ross 548 (ZZ Ceti) | 8,209 | 0.0118±0.0002 | |||
| 39 Ceti B (AY Ceti B) | 8,350 | 0.012 | |||
| Mira B (VZ Ceti) | 8,350 | 0.012 | |||
| WD 1054−226 | 8,350 | 0.012±0.001 | |||
| Gliese 440 | 8,550 | 0.0123 ± 0.0009 | Fourth-closest white dwarf. | ||
| Procyon B | 8,585 | 0.01234±0.00032 | Second-closest white dwarf. | ||
| GD 165 A | 8,627 | 0.0124±0.0003 | |||
| Epsilon2 Arae C | 8,627 | 0.0124±0.0003 | |||
| WD 0806−661 (Maru) | 8,860 | 0.0127 | Has one confirmed exoplanet. | ||
| SW Ursae Majoris | 8,975 | 0.0129+0.0009 −0.0010 | |||
| Epsilon Reticuli B | 8,975–9,809 | 0.0129–0.0141 | |||
| G 29-38 | 8,975 | 0.0129 | |||
| AM Herculis A | 9,040 | 0.013+0.0017 −0.0014 | |||
| 40 Eridani B | 9,100 | 0.01308±0.0002 | First white dwarf to be discovered and the fifth-closest one. | ||
| TY Coronae Borealis | 9,110 | 0.0131±0.0014 | |||
| HD 147513 B | 9,144 | 0.0131 | |||
| GD 358 (V777 Herculis) | 9,170 | 0.0132 | |||
| Wolf 489 | 9,170 | 0.0132 | |||
| GALEX J2339−0424 | 9,253 | 0.0133±0.0008 | |||
| G 107-70 A | 9,412 | 0.0135 | |||
| Wolf 1346 | 9,670 | 0.0139±0.0006 | |||
| WD 1032+011 A | 10,230 | 0.0147±0.0013 | |||
| Gliese 318 | 10,300 | 0.0148 | |||
| RR Caeli A | 10,909 | 0.01568±0.00009 | |||
| HL Tau 76 | 11,270 | 0.0162 | |||
| 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. | |
| WD 2226−210 | 17,390 | 0.025±0.001 | White dwarf | Located in Helix Nebula | |
| WD 0032−317 A | 18,510 | 0.0266±0.0012 | |||
| Feige 55 | 19,460 | 0.027965 | |||
| 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, comparable to A-type stars such as Vega and Sirius. | |
| KPD 0005+5106 | 41,000 | 0.059+0.031 −0.018 | Pre-white dwarf | Has one unconfirmed exoplanet. | |
| 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. | |
| Regulus Ab | 42,440 | 0.061±0.011 | Pre-white dwarf | ||
| PSR J0348+0432 B | 45,220 | 0.065±0.005 | White dwarf | Orbiting a pulsar. | |
| TMTS J0526+5934 B | 45,990 | 0.0661±0.0054 | Subdwarf B star | Smallest known non-degenerate star. | |
| WISEA 1810−1010 | 46,610 | 0.067+0.032 −0.02 | Brown dwarf |
50,000 to 125,000 km
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 | ||
| DENIS 0255−4700 | 53,986 | 0.0776±0.0060 | Faintest brown dwarf with a measured visual magnitude. | ||
| BE Ursae Majoris A | 54,300 | 0.078±0.004 | Subdwarf O star | ||
| 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. | |
| 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. | |
| 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). | ||
| 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. | ||
| Epsilon Indi Ba | 55,700 | 0.08–0.081 | |||
| WISE J0623-0456 | 55,800 or 79,400 | 0.0802+0.0175 −0.0134 or 0.1141±0.0144 | |||
| LHS 6343 C | 56,340 | 0.08098±0.00442 | |||
| Epsilon Indi Bb | 57,050 | 0.082–0.083 | |||
| Wolf 1130 C | 57,200 | 0.0822±0.0021 | |||
| 54 Piscium B | 57,900 | 0.0832±0.0021 | |||
| Gliese 229 Ba | 57,910 | 0.08324+0.00514 −0.01233 | |||
| EBLM J0555−57Ab | 58,720 | 0.0844+0.0131 −0.006 | Red dwarf | Smallest known red dwarf. | |
| Scholz's Star B | 58,770 | 0.08447+0.0015 −0.0016 | Brown dwarf | A nearby star that passed through the Solar System's Oort cloud 80,000 years ago. | |
| EPIC 201702477b | 59,340 | 0.0853±0.0041 | |||
| GJ 1245 C | 60,530 | 0.087±0.004 | Red dwarf | ||
| Gliese 229 Bb | 60,770 | 0.0874+0.0123 −0.0051 | Brown dwarf | ||
| 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. | |
| HD 63754 B | 61,500–67,900 | 0.0884–0.0976 | Brown dwarf | Among the most massive brown dwarfs. | |
| HD 72946 B | 61,500 | 0.0884 | |||
| Gliese 570 D | 63,629 | 0.09146+0.0051 −0.0041 | |||
| 2MASS 0243−2453 | 64,004–73,744 | 0.092–0.106 | |||
| 2MASS J0348−6022 | 64,700 | 0.093+0.016 −0.010 | |||
| WISE 0146+4234 A | 65,270 | 0.0938+0.0024 −0.0026 | |||
| Kelu-1 B | 65,400 to 72,500 | 0.094 to 0.104 | |||
| SCR 1845−6357 A | 65,470 | 0.0941±0.0039 | Red dwarf | ||
| WISE 0146+4234 B | 65,670 | 0.09944+0.0035 −0.0015 | Brown dwarf | ||
| SDSS J1416+1348 A | 65,700 | 0.0945±0.0082 | |||
| Kelu-1 A | 66,000 to 74,900 | 0.095 to 0.108 | |||
| 47 Ophiuchi C | 66,500 | 0.0956±0.001 | |||
| 2MASS 0937+2931 | 67,200 | 0.0966±0.0164 | |||
| 2MASS J1047+21 | 67,200 | 0.0966±0.0164 | |||
| CoRoT-15b | 67,200 | 0.0966±0.0123 | |||
| SDSS J1416+1348 B | 67,200 | 0.0966±0.0164 | |||
| WISE 0359−5401 | 67,200 | 0.0966±0.0021 | |||
| TVLM 513-46546 | 67,480—75,830 | 0.097–0.109 | Has one confirmed exoplanet. | ||
| CWISEP J1935-1546 | 67,900 | 0.0976±0.0143 | |||
| Eta Coronae Borealis C | 67,900 | 0.0976±0.0031 | |||
| WISE 2150−7520 B | 67,900 | 0.0976±0.0164 | |||
| LHS 1070 C | 68,180 | 0.098 | Certainly a brown dwarf based on its mass. | ||
| WASP-30B | 68,670 | 0.0987±0.0031 | |||
| WASP-128B | 68,670 | 0.0987±0.0021 | |||
| HD 33632 Ab | 69,350 | 0.0997 | |||
| 2MASS J0407+1546 | 69,570 | 0.100+0.024 −0.008 | |||
| 2MASS J1219+3128 | 69,570 | 0.100+0.027 −0.013 | |||
| HD 114762 B | 69,570 | 0.100 | Red dwarf | ||
| R Aquarii B | >70,000 | >0.1 | White dwarf | Makes a symbiotic binary with its companion R Aquarii A, a red giant. | |
| EBLM J0954−23 | 70,266 | 0.101±0.017 | Red dwarf | ||
| KOI-189 B | 70,474–71,796 | 0.1013–0.1032 | |||
| Scholz's Star A | 70,900 | 0.1019+0.0006 −0.0007 | A nearby star that passed through the Solar System's Oort cloud 80,000 years ago. | ||
| 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. | |
| Luhman 16 A | 70,960 | 0.102±0.005 | Nearest brown dwarfs to Earth. | ||
| Luhman 16 B | 70,960 | 0.102±0.005 | |||
| HD 28736 B | 71,280 | 0.1025±0.0024 | |||
| 15 Sagittae B | 71,492 | 0.1028±0.0411 | |||
| GD 165 B | 71,492 | 0.1028±0.008 | |||
| LHS 1070 B | 72,350 | 0.104 | Likely a brown dwarf based on its mass. | ||
| 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. | ||
| WISE 2150-7520 A | 73,640 | 0.1058±0.0062 | |||
| BW Sculptoris B | 73,640 | 0.1058±0.0051 | |||
| Ross 614 B | 74,100 | ~0.107 | Red dwarf | ||
| LHS 2924 | 74,440 | 0.107 | Was the smallest known star at its discovery. | ||
| DENIS J1048−3956 | 75,140 | 0.108 | |||
| VZ Piscium B | 75,800 | 0.1089±0.0041 | Also called NLTT 56936 B or HIP 115819 B. | ||
| WISE 0607+2429 | 75,800 | 0.1089±0.0175 | Brown dwarf | ||
| ESO 207-61 | 76,500 | 0.11±0.02 | One of the first brown dwarfs to be identified. | ||
| 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. | ||
| CoRoT-3b | 77,220 | 0.111±0.0051 | |||
| TOI-2119 B | 77,220 | 0.111±0.0031 | |||
| 2MASS 1237+6526 | 77,930 | 0.112±0.016 | Has one unconfirmed exoplanet. | ||
| LHS 2065 | 78,610 | 0.113±0.006 | Red dwarf | ||
| WISE J004945.61+215120.0 | 80,100 | 0.1151±0.0123 | Brown dwarf | ||
| 2MASS J0523−1403 | 80,500 | 0.1157±0.0065 | Red dwarf | ||
| KELT-1B | 80,770 | 0.1161±0.0031 | Brown dwarf | ||
| LHS 292 | 80,980 | 0.1164±0.0044 | Red dwarf | Not to be confused with LHS 2924 (see above) | |
| WISE 1405+5534 | 82,220 | 0.1182±0.0021 | Brown dwarf | ||
| vB 10 | 82,300 | 0.1183+0.0059 −0.0057 | Red dwarf | ||
| 2M1540 | 82,790 | 0.119 | |||
| EI Cancri B | 82,790 | 0.119±0.021 | |||
| 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. | |
| TRAPPIST-1 | 82,927 | 0.1192±0.0013 | Red dwarf | Hosts a planetary system with seven confirmed planets. | |
| OGLE-TR-122B | 83,480 | 0.120+0.024 −0.013 | Was the smallest known star from 2005 to 2013. | ||
| Teegarden's Star | 83,480 | 0.120±0.012 | Has three confirmed exoplanets. | ||
| G 196-3 B | 84,400 | 0.1213±0.00719 | Brown dwarf | ||
| Königstuhl 1 B | 84,400 | 0.1213±0.0021 | |||
| vB 8 | 84,458 | 0.1214+0.006 −0.0057 | Red dwarf | ||
| LS IV-14 116 | 84,900 | 0.122 | Subdwarf B star | ||
| SPECULOOS-3 | 85,600 | 0.123±0.0022 | Red dwarf | Has one confirmed exoplanet. | |
| 2MASS 0122-2439 B | 85,800 | 0.1233±0.021 | |||
| DX Cancri | 85,920 | 0.1235±0.0006 | |||
| LHS 2090 | 86,960 | 0.125±0.005 | |||
| VHS J1256–1257b | 87,200 | 0.125 | Brown dwarf | ||
| LHS 288 | 87,380 | 0.1256±0.0042 | Red dwarf | ||
| Gliese 412 B | 87,797 | 0.1262±0.0054 | |||
| OY Carinae B | 88,350 | 0.127 | |||
| AZ Cancri | 88,630 | 0.1274±0.0195 | |||
| 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. | |
| GJ 1245 B | 90,400 | 0.13±0.007 | Red dwarf | ||
| Gliese 623 B | 92,350 | 0.133 ± 0.008 | |||
| Gliese 105 C | 92,459 | 0.1329+0.0057 −0.0055 | |||
| Teide 1 | 93,711 | 0.1347+0.0123 −0.0077 | Brown dwarf | First brown dwarf to be confirmed. | |
| EI Cancri A | 94,620 | 0.136±0.020 | Red dwarf | ||
| Alpha Trianguli B | 97,400 | 0.14 | |||
| LHS 1070 A | 97,400 | 0.14 | |||
| HD 149382 | 99,485 | 0.143 | Subdwarf B star | ||
| EZ Aquarii A (Luyten 789-6 A) | 99,485 | 0.143±0.022 | Red dwarf | ||
| EZ Aquarii B (Luyten 789-6 B) | 99,485 | 0.143±0.022 | |||
| Wolf 359 | 100,180 | 0.144±0.004 | Fifth-nearest star system to Earth. | ||
| DENIS-P J1058.7−1548 | 101,500 | 0.1459±0.001 | Brown dwarf | ||
| GJ 1245 A | 101,570 | 0.146±0.007 | Red dwarf | ||
| LP 944-20 | 102,900 | 0.1479±0.0144 | Brown dwarf | Among the brightest brown dwarfs. | |
| Wolf 424 A | 104,350 | 0.150±0.019 | Red dwarf | ||
| NY Virginis A | 105,000 | 0.151±0.001 | Subdwarf B star | ||
| EX Hydrae B | 105,300 | 0.1513 | Red dwarf | ||
| GJ 1061 | 105,750 | 0.152±0.007 | Has three confirmed exoplanets. | ||
| Wolf 424 B | 106,440 | 0.153±0.019 | |||
| Proxima Centauri | 107,280 | 0.1542±0.0045 | The nearest extrasolar star. Has one confirmed planet, one candidate, and one disputed | ||
| 85 Pegasi Bb | 107,830 | 0.155 | |||
| Gliese 65 B (Luyten 726-8 B) | 110,620 | 0.159±0.006 | The Gliese 65 system may host a Neptune-mass planet. | ||
| NY Virginis B | 111,310 | 0.16 | |||
| GL Virginis | 111,520 | 0.1603±0.0053 | |||
| TZ Arietis (GJ 9066) | 112,010 | 0.161±0.014 | Has one confirmed exoplanet. | ||
| 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. | |
| 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. | |
| Kepler-451 B | 116,880 | 0.168±0.001 | |||
| YZ Ceti | 116,880 | 0.168±0.009 | Has three confirmed exoplanets. | ||
| HR 858 B | 118,000 | 0.17±0.04 | |||
| LP 791-18 | 118,000 | 0.17±0.018 | Has three confirmed exoplanets. | ||
| UY Sextantis | 118,000 | 0.17±0.01 | Subdwarf B star | ||
| 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. | |
| HIP 81208 Cb | 122,100 | 0.175 ± 0.009 | Brown dwarf | ||
| AB Doradus C | 124,000 | 0.178 | Red dwarf | Among the least massive stars confirmed. | |
| Gliese 22 B | 124,530 | 0.179±0.009 |
125,000 to 200,000 km
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 | ||
| HW Virginis A | 127,310 | 0.183±0.026 | Subdwarf B star | ||
| HU Delphini A | 128,010 | 0.184±0.004 | Red dwarf | ||
| Gliese 29 B | 129,400 | 0.186±0.014 | |||
| GJ 3323 | 129,540 | 0.1862±0.0059 | Has two confrirmed exoplanets. | ||
| 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. | ||
| Alpha Mensae B | 132,180 | 0.19±0.01 | |||
| GJ 1128 | 132,000 | 0.190±0.014 | |||
| Ross 248 (HH Andromedae) | 132,180 | 0.19 | |||
| Ross 128 (Gliese 447) | 137,750 | 0.198±0.007 | Has one confirmed exoplanet. | ||
| Ross 154 (V1216 Sagittarii) | 139,140 | 0.200±0.008 | |||
| GJ 1062 | 140,500 | 0.202±0.012 | Red subdwarf | Another size estimates include 0.372±0.076 R☉ and 0.411±0.051 R☉. | |
| Kepler-70 | 141,200 | 0.203±0.007 | Subdwarf B star | Has two unconfirmed exoplanets. | |
| Kepler-451 A | 141,200 | 0.203±0.001 | Possibly has two exoplanets. | ||
| RR Caeli B | 141,200—149,600 | (0.203–0.215) ± 0.015 | Red dwarf | ||
| GJ 1214 (Orkaria) | 141,920 | 0.204+0.0085 −0.0084 | Has one confirmed exoplanet. | ||
| LHS 1140 | 142,600 | 0.205±0.008 | Has two confirmed exoplanets. | ||
| Krüger 60 B | 145,400 | 0.209±0.017 | |||
| Ross 508 | 147,000 | 0.2113±0.0063 | Has one confirmed exoplanet. | ||
| GJ 1132 | 149,580 | 0.215±0.009 | |||
| QY Aurigae A | 151,660 | 0.218±0.021 | |||
| QY Aurigae B | 151,660 | 0.218±0.021 | |||
| Kepler-16 B | 157,388 | 0.22623±0.00059 | Has one confirmed exoplanet. | ||
| Fomalhaut C | 160,000 | 0.23 ± 0.01 | |||
| V391 Pegasi | 160,000 | 0.23 | Subdwarf B star | Has one unconfirmed exoplanet. | |
| Gliese 777 B | 160,710 | 0.231±0.025 | Red dwarf | ||
| Kepler-1649 | 161,190 | 0.2317±0.0049 | Has two confirmed exoplanets. | ||
| Eta Telescopii B | 163,000 | 0.234±0.003 | Brown dwarf | ||
| CM Draconis B | 165,100 | 0.23732±0.00014 | Red dwarf | ||
| Ross 47 | 165,580 | 0.238±0.009 | |||
| Kepler-429 | 166,970 | 0.24 | Subdwarf B star | Has three unconfirmed exoplanets. | |
| 2M1207 A | 172,000 | 0.247+0.041 −0.082 | Brown dwarf | ||
| PZ Telescopii B | 173,900 | 0.25+0.03 −0.04 | |||
| CM Draconis A | 174,710 | 0.25113±0.00016 | Red dwarf | ||
| DG Canum Venaticorum A | 176,010 | 0.253 | |||
| Ross 614 A | 176,710 | 0.254±0.028 | |||
| Gliese 625 | 177,400 | 0.255±0.034 | |||
| Gliese 12 | 182,060 | 0.2617+0.0058 −0.0070 | Has one confirmed exoplanet. | ||
| HIP 79098 B | 185,800 | 0.2672±0.0617 | Brown dwarf | ||
| BX Trianguli B | 188,000 | 0.27±0.01 | Red dwarf | Has one confirmed exoplanet. | |
| V846 Arae B | 188,000 | 0.27±0.04 | Subdwarf O star | ||
| Mu Herculis C | 189,930 | 0.273±0.032 | Red dwarf | ||
| 40 Eridani C | 190,620 | 0.274±0.011 | |||
| Struve 2398 B | 194,800 | 0.280±0.005 | |||
| Gliese 402 | 197,580 | 0.284±0.011 | |||
| GJ 3991 | 197,580 | 0.286±0.011 |
200,000 to 275,000 km
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 | ||
| CoRoT-7 B | 201,800 | 0.29 | |||
| Mu Cassiopeiae Ab | 201,800 | 0.29 | |||
| AP Columbae | 202,400 | 0.291±0.009 | The nearest pre-main sequence star to Earth. | ||
| 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. | |
| Stein 2051 A | 203,100 | 0.292±0.031 | Red dwarf | ||
| HN Librae | 208,000 | 0.299±0.009 | Has one confirmed exoplanet. | ||
| 3 Puppis B | 210,000 | 0.3 | Hot subdwarf | This star is losing 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. | |
| LS Muscae B | ~210,000 | 0.3±0.1 | Subdwarf O star | ||
| Krüger 60 A | 209,400 | 0.301±0.015 | Red dwarf | ||
| Gliese 581 | 210,100 | 0.302±0.005 | Has three confirmed exoplanets. | ||
| L 98-59 | 210,800 | 0.303+0.026 −0.023 | Has four confirmed exoplanets and one unconfirmed. | ||
| EQ Pegasi B | 210,800 | 0.303±0.013 | |||
| Luyten's Star (Gliese 273) | 221,930 | 0.319±0.004 | Has two confirmed exoplanets and two unconfirmed. | ||
| Wolf 1061 | 221,930 | 0.319±0.007 | Has three confirmed exoplanets. | ||
| GJ 3929 | 223,000 | 0.32±0.01 | Has two confrirmed exoplanets. | ||
| Xi Ursae Majoris Ab | 223,000 | 0.32 | |||
| Gliese 486 (Gar) | 228,190 | 0.328±0.011 | Has one confirmed exoplanet. | ||
| YZ Canis Minoris | 228,190 | 0.328±0.013 | |||
| LHS 1678 | 228,890 | 0.329±0.01 | Has three confirmed exoplanets. | ||
| Regulus C | 231,000 | 0.332±0.023 | |||
| AM Herculis B | 230,000 | 0.33 | |||
| Wolf 1130 A | 230,000 | 0.33 | Nearest candidate for a supernova, a type Ia supernova. | ||
| 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. | ||
| Gliese 357 | 231,670 | 0.333 | Has three confirmed exoplanets. | ||
| Gliese 667 C | 234,450 | 0.337±0.014 | Has two confirmed exoplanets. | ||
| Aldebaran B | 241,410 | 0.347±0.034 | |||
| Struve 2398 A (Gliese 725 A) | 244,200 | 0.351±0.003 | Has one confirmed exoplanet. | ||
| Gliese 251 | 253,230 | 0.364±0.001 | |||
| Ross 458 A | 256,020 | 0.368±0.031 | Has one confirmed exoplanet. | ||
| 2MASS 0122–2439 A | 257,000 | 0.369 ± 0.048 | |||
| Furuhjelm 46 B | 257,000 | 0.37±0.07 | |||
| Furuhjelm 46 A | 257,000 | 0.37±0.07 | |||
| Innes' star | 258,100 | 0.371±0.012 | |||
| Gliese 876 (IL Aquarii) | 258,800 | 0.372±0.004 | Has four confirmed exoplanets. First red dwarf known to host exoplanets. | ||
| LHS 6343 A | 259,500 | 0.373±0.005 | |||
| LTT 3780 | 260,190 | 0.374±0.011 | Has two confirmed exoplanets. | ||
| Gliese 22 C | 261,580 | 0.376±0.018 | |||
| TOI-270 | 262,970 | 0.378±0.011 | |||
| Gliese 1 | 263,700 | 0.379±0.002 | |||
| 13 Ceti Ab | 264,000 | 0.38 | |||
| GQ Lupi B | 264,000 | 0.38±0.072 | Brown dwarf | ||
| Groombridge 34 A (Gliese 15 A) | 267,840 | 0.385±0.002 | Red dwarf | ||
| Gliese 412 A | 272,710 | 0.398±0.009 | |||
| Lalande 21185 | 272,710 | 0.392±0.004 | |||
| Gliese 22 B | 274,110 | 0.394 | |||
| LHS 6343 B | 274,110 | 0.394±0.012 |
275,000 to 350,000 km
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 | ||
| Asellus Primus B (Theta Boötis B) | 279,180 | 0.4013±0.012 | |||
| GJ 3293 | 281,100 | 0.404±0.027 | |||
| Gliese 623 A | 280,900 | 0.404 ± 0.024 | |||
| Gliese 908 (Lalande 46650) | 284,540 | 0.409±0.023 | |||
| EQ Pegasi A | 284,540 | 0.409±0.016 | Has one confirmed exoplanet. | ||
| Gliese 163 | 284,540 | 0.409+0.017 −0.016 | |||
| SDSS J001820.5−093939.2 | 285,930 | 0.411+0.090 −0.011 | F-type star | Among the most metal-poor stars. | |
| Gliese 806 | 288,300 | 0.4144±0.0038 | Red dwarf | Has three confirmed exoplanets. | |
| Gliese 317 | 290,110 | 0.4170±0.0013 | Has two confirmed exoplanets. | ||
| Gliese 687 | 291,290 | 0.4187+0.0066 −0.0063 | |||
| QS Virginis B | 292,000 | 0.42±0.02 | |||
| TOI-700 | 292,000 | 0.420±0.031 | |||
| Gliese 180 | 294,210 | 0.4229±0.0047 | Has two confirmed exoplanets and one unconfirmed. | ||
| AD Leonis | 294,490 | 0.4233±0.0057 | |||
| Gliese 686 | 297,060 | 0.427±0.013 | |||
| GJ 3634 | 300,000 | 0.43±0.03 | Has one confirmed exoplanet. | ||
| Iota Ursae Majoris B | 300,000 | 0.43 | |||
| U Geminorum B | 300,000 | 0.43±0.06 | |||
| Gliese 436 | 300,540 | 0.432±0.011 | Has one confirmed exoplanet. | ||
| Gliese 393 | 300,540 | 0.432±0.025 | |||
| Sigma Coronae Borealis C | 304,020 | 0.437±0.020 | |||
| Kappa1 Apodis B | 306,000 | 0.44±0.06 | Subdwarf O star | ||
| WR 93b | 306,000 | 0.44 | Wolf-Rayet | ||
| Gliese 832 | 307,500 | 0.442±0.018 | Red dwarf | ||
| Alpha Caeli B | 313,000 | 0.45 | |||
| Gliese 367 (Anañuca) | 317,930 | 0.457±0.013 | Has three confirmed exoplanets. | ||
| Gliese 588 | 320,000 | 0.46±0.019 | |||
| Iota Ursae Majoris C | 320,000 | 0.46 | |||
| Gliese 849 | 322,800 | 0.464±0.018 | |||
| BAT99-123 (Brey 93) | 327,000 | 0.47 | Wolf-Rayet | ||
| Gliese 176 | 329,760 | 0.474±0.015 | Red dwarf | ||
| Lacaille 9352 | 329,760 | 0.474±0.008 | |||
| Tau Boötis B | 333,900 | 0.48±0.05 | |||
| Gliese 752 A | 334,630 | 0.481±0.014 | |||
| UScoCTIO 108 A | 336,720 | 0.484 | Brown dwarf | ||
| Gliese 526 | 338,810 | 0.487±0.008 | Red dwarf | ||
| UX Ursae Majoris B | 345,070–484,900 | 0.496–0.697 | |||
| Theta Persei Ab | 346,500 | 0.498±0.017 | |||
| GJ 3470 (Kaewkosin) | 347,150 | 0.499±0.021 | |||
| Gliese 22 A | ~350,000 | ~0.5 | |||
| Kappa Reticuli B | 347,900 | 0.50 | |||
| TOI-2119 | 347,900 | 0.500±0.015 |
Smallest stars 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 | 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. | |
| 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. | |
| 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. | |
| 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. |
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.
| 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. | |
| 2MASS J0523−1403 | 2013-2017 | 0.102 | 1.01 | 70,600 km (43,900 mi) | Lowest mass main sequence star as of 2020. | |
| OGLE-TR-122B | 2005-2013 | 0.117 | 1.16 | 81,100 km (50,400 mi) |
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