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  , as well as all red dwarfs smaller than and all neutron stars with accurately measured radii.

0 to 1,000 km Partial list containing stars up to . Star name Star radius, kilometres Star class Notes References SGR J1935+2154MagnetarHas one potential planet.RX J0720.4−3125Neutron starHercules X-1PulsarLMC X-4Centaurus X-3Vela X-1HESS J1731-347Neutron starLightest neutron star ever discovered, at a mass of .PSR J0348+0432 APulsarHas a white dwarf companion.PSR J0437−4715>11.1Most stable known natural clock.GW170817 AGW170817 BPSR J1906+0746PSR J0205+644912PulsarPulsar located in the supernova remnant 3C 58.RX J1856.5−3754Neutron starPSR J2043+1711PulsarPSR J1933-6211PSR J0952–0607 AMost massive neutron star so far discovered.Neutron starVela pulsarPulsarPSR J1614−2230PSR J0348+0432PSR J0740+662014Neutron starHas a substellar companion orbiting it closely.PSR J1748−2446Ad16PulsarFasted spinning neutron star, it is constrained to a small size to avoid being torn apart, located in the star cluster Terzan 5, and potentially the largest known pulsar.

1,000 to 50,000 km Partial list containing stars from . Star name Star radius, kilometres Star radius, Star class Notes References RE J0317-8530.0032Among the most massive white dwarfs.SDSS J023836.27+764219.02,230An ultramassive white dwarf ejected from the Hyades. At a mass of , it is possibly the most massive known white dwarf consistent with single-star evolution.ZTF J1901+14582,664Among the most massive white dwarfs, at , and a candidate white dwarf pulsar.T Coronae Borealis0.0045Expected to become a nova in the near future, its apparent magnitude may increase up to 2.0.JanusA white dwarf with a side of hydrogen and another side of helium.Wolf 1130 B0.005Nearest candidate for a supernova, a type Ia supernova.HD 49798 B3,580BPM 37093IK Pegasi B0.006U Geminorum AWD 2317+1830BW SculptorisSirius BNearest white dwarfGRW +70 8247(Gliese 742)Gamma Cassiopeiae AbAN Ursae Majoris6,300Gliese 915LP 658-2BZ Ursae Majoris A6,880QS Virginis AAE Aquarii A0.01 First discovered white dwarf pulsar.AR Scorpii A7,000A white dwarf pulsar. It is often mistaken as the first discovered white dwarf pulsar.YZ Leonis Minoris0.01GW LibraeWZ SagittaeMY ApodisOY Carinae A0.011TMTS J0526+5934 A0.011G 99-477,650 EX Hydrae0.011RX Andromedaevan Maanen 2Third-closest white dwarf.Stein 2051 BG 107-70 BRoss 548(ZZ Ceti)39 Ceti B(AY Ceti B)0.012WD 1054−226Gliese 440Fourth-closest white dwarf.Procyon BSecond-closest white dwarf.GD 165 AEpsilon2 Arae CWD 0806−661(Maru)Has one confirmed exoplanet.SW Ursae MajorisEpsilon Reticuli B–0.0129–0.0141G 29-38AM Herculis A40 Eridani BFirst white dwarf to be discovered and the fifth-closest one.TY Coronae BorealisHD 147513 B GD 358(V777 Herculis)0.0132Wolf 489GALEX J2339−0424G 107-70 AWolf 1346WD 1032+011 AGliese 318RR Caeli A0.01568HL Tau 760.0162Mira B(VZ Ceti)14,1000.20Based on the most likely mass estimate, . Alternatively, it may have a mass of with a radius of (10,700 km).PG 1159-035 or 0.0232 or PG 1159 star(Pre-degenerate)PG 1159 stars are pre-white dwarfs.WD 2226−210White dwarfLocated in Helix NebulaWD 0032−317 AFeige 550.029Brown dwarf with an orbital period of 62 minutes and a dayside surface temperature of , comparable to A-type stars such as Vega and Sirius.V906 Carinae A0.03White dwarfBE Ursae Majoris ASubdwarf O starSmallest known non-compact star.KPD 0005+5106Pre-white dwarfHas one unconfirmed exoplanet.AG Pegasi B0.06White dwarfIn a symbiotic binary with AG Peg A, has undergone many mass transfer events, varying in radius, luminosity and temperature.Regulus AbPre-white dwarfPSR J0348+0432 BWhite dwarfOrbiting a pulsar.TMTS J0526+5934 BSubdwarf B starWISEA 1810−1010Brown dwarf

50,000 to 125,000 km Partial list containing stars from . Star name Star radius, kilometres Star radius, Star class Notes References SCR 1845−6357 BBrown dwarfSDSS 1624+00UGPS J0521+3640DENIS 0255−4700Faintest brown dwarf with a measured visual magnitude.SDSS J1007+1930~0.078Potential member of the Regulus system, which could be one of the most widely separated stellar systems. This brown dwarf is at  light-years from Regulus.WD 0032−317 BA highly irradiated brown dwarf with a dayside temperature hotter than the surface of Sun. Its dayside temperature measures , while its nightside is much cooler, at .2MASS 1507−16270.08Epsilon Indi Ba0.08–0.081WISE J0623-0456 or or LHS 6343 CHD 19467 BWISE 1534–1043This 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 Bb0.082–0.083Wolf 1130 CWISE 0458+6434 AWISE 0458+6434 B54 Piscium BGliese 229 BaCWISEP J1446−2317EBLM J0555−57AbRed dwarfSmallest known red dwarf.Scholz's Star BBrown dwarfA nearby star that passed through the Solar System's Oort cloud 80,000 years ago.2MASS J0415−0935GJ 1245 CRed dwarfGliese 229 BbBrown dwarfRed dwarfAn 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–0.0884–0.0976Brown dwarfAmong the most massive brown dwarfs.HD 72946 B0.08842MASS J09393548−2448279 B0.09CWISEP J1047+5457WISE J2354+0240WISEPA J031325.96+780744.2Gliese 570 D2MASS 0243−2453–0.092–0.106ZTF J1239+8347 B–0.092–0.144Within a brown dwarf binary system with an orbital period of 57.41 minutes, a separation close enough for it to lose mass to the primary via an accretion disk.2MASS J0348−6022WISE 0146+4234 AKelu-1 B to to SCR 1845−6357 ARed dwarfWISE 0146+4234 BBrown dwarfSDSS J1416+1348 AKelu-1 A to to 47 Ophiuchi CWISE 1405+55342MASS 0937+29312MASS J1047+21CoRoT-15bSDSS J1416+1348 BWISE 0359−5401WISE 0734−7157WISE 2220−3628TVLM 513-46546Has one confirmed exoplanet.CWISEP J1935-1546 CWISE 2150−7520 BLHS 1070 C0.098Certainly a brown dwarf based on its mass.WASP-30BWASP-128BGliese 758 B HD 33632 Ab0.09972MASS J0407+15462MASS J1219+3128HD 114762 BRed dwarfR Aquarii B>>0.1White dwarfMakes a symbiotic binary with its companion R Aquarii A, a red giant.EBLM J0954−23 Red dwarfHD 130948 CBrown dwarfKOI-189 B–0.1013–0.1032Red dwarfScholz's Star AA nearby star that passed through the Solar System's Oort cloud 80,000 years ago.Gliese 569 BbBrown dwarfFirst 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 ANearest brown dwarfs to Earth.Luhman 16 BHD 28736 B15 Sagittae B71,492HD 130948 B71,492GD 165 B71,4922MASS 0036+18212MASS J11145133−2618235LHS 1070 B0.104Likely a brown dwarf based on its mass.WD 1032+011 BA brown dwarf orbiting a white dwarf with an extremely low orbital period of , both being tidally locked to each other.WISE 2150-7520 ABW Sculptoris BRoss 458 BRed dwarfRoss 614 B~LHS 29240.107Was the smallest known star at its discovery.WISE 0855−0714Brown dwarfCoolest-known brown dwarf, at .DENIS J1048−39560.108Red dwarfVZ Piscium BAlso called NLTT 56936 B or HIP 115819 B.WISE 0607+2429Brown dwarfWISE J2209+2711ESO 207-61One of the first brown dwarfs to be identified.Kepler-39bKepler-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.WISE J1206+8401CoRoT-3bTOI-2119 B2MASS 1237+6526Has one unconfirmed exoplanet.WISE J1122+25LHS 2065Red dwarfWISE 0825+2805Brown dwarfWISE J004945.61+215120.02MASS J0523−1403Red dwarfKELT-1BBrown dwarfLHS 292Red dwarfNot to be confused with LHS 2924 (see above)WISE 1541−2250Brown dwarfvB 10Red dwarf2M15400.119EI Cancri BGliese 569 BaBrown dwarfFirst brown dwarf ever discovered, together with its companion Gliese 569 Bb, which were thought to be a single astronomical body at the time.TRAPPIST-1Red dwarfHosts a planetary system with seven confirmed planets.OGLE-TR-122BWas the smallest known star from 2005 to 2013.Teegarden's StarHas three confirmed exoplanets.G 196-3 BBrown dwarfKönigstuhl 1 BvB 8Red dwarfLS IV-14 1160.122Subdwarf B starSPECULOOS-3Red dwarfHas one confirmed exoplanet.ZTF J1239+8347 ABrown dwarfWithin a brown dwarf binary system with an orbital period of 57.41 minutes, a separation close enough for it to accrete mass from the secondary via an accretion disk.2MASS 0122-2439 BDX CancriRed dwarfCapotauroBrown dwarfPreviously suspected to be an extragalactic object, such as extremely old and distant galaxy based on a high photometric redshift, which formed only 90 million years after the Big Bang, a black hole star, or a dusty galaxy with a lower redshift and less extreme properties, or simply a Y-type brown dwarf within the Milky Way, which was confirmed to be true in 2026.2MASS J09393548−2448279 AVHS J1256–1257b0.125LHS 2090Red dwarfLHS 288Gliese 412 BOY Carinae B0.127AZ CancriAS Leonis Minoris B0.13–0.51White dwarf or Subdwarf B starAS Leonis Minoris is an eclipsing binary system made up of a luminous red giant () and a hot companion (AS LMi B). It has the longest period of any known eclipsing binary at 69 years.GJ 1245 BRed dwarfGliese 623 BGliese 105 CTeide 1Brown dwarfFirst brown dwarf to be confirmed.CWISE J0506+0738EI Cancri ARed dwarfAlpha Trianguli BLHS 1070 A0.14HD 1493820.143Subdwarf B starEZ Aquarii A (Luyten 789-6 A)Red dwarfEZ Aquarii B (Luyten 789-6 B)Wolf 359Fifth-nearest star system to Earth.DENIS-P J1058.7−1548Brown dwarfGJ 1245 ARed dwarfLP 944-20Brown dwarfAmong the brightest brown dwarfs.Wolf 424 ARed dwarfNY Virginis ASubdwarf B starEX Hydrae B0.1513Red dwarf GJ 1061Has three confirmed exoplanets.Wolf 424 B2MASS J1115+1937Brown dwarfProxima CentauriRed dwarf The nearest extrasolar star. Has one confirmed planet, one candidate, and one disputed85 Pegasi Bb0.155 2M1510 A Brown dwarfThe system has a candidate planet (2M1510 b) that orbits on a polar orbit, although it may be a false positive detection. 2M1510 B WISE 0535−7500May be a binary system of two smaller brown dwarfs.2MASS J0249−0557 cGliese 65 B (Luyten 726-8 B)Red dwarf The Gliese 65 system may host a Neptune-mass planet.LP 40-365White dwarfA white dwarf that might have formed in a type Iax supernova.HD 53143 BRed dwarf NY Virginis B0.16GL VirginisTZ Arietis (GJ 9066)Has one confirmed exoplanet.Gliese 65 A (Luyten 726-8 A)The Gliese 65 system may host a Neptune-mass planet.Kepler-451 BYZ CetiG 192-15HR 858 BLP 791-18Has three confirmed exoplanets.UY SextantisSubdwarf B starZ Andromedae B to to White dwarfMakes a symbiotic binary with its companion Z Andromedae A, a red giant.HIP 81208 CbBrown dwarfAB Doradus C0.178Red dwarfAmong the least massive stars confirmed.Gliese 22 B

125,000 to 200,000 km Partial list containing stars from .