List of smallest stars

This is an incomplete list of the smallest known stars. Most of the stars in this list are within the Milky Way except BAT99-123 (near the end of the list), which is in the Large Magellanic Cloud.

Smallest stars are mostly red dwarfs, brown dwarfs, white dwarfs and neutron stars.

1 solar radius (radius of the Sun) = 695700 km

Star name	Star radius (in solar radii)	Star type	Notes
RX J0720.4-3125	0.000007187	Neutron star
4U 1820-30	0.00001308035	Pulsar
PSR B1257+12	0.00001437401	Pulsar	Coolest neutron star known. Orbited by 3 exoplanets.
Crab Pulsar	0.00001437401	Pulsar	A very young neutron star (went supernova in 1054 AD)
Geminga	0.00001437401	Pulsar
PSR B0943+10	0.00001437401	Pulsar	Hottest neutron star known
XTE J1739-285	0.00001566767	Neutron star or quark star
Vela Pulsar	0.00001799626	Pulsar
PSR J0348+0432 A	0.00001868621	Pulsar
PSR J1748-2446ad	0.00002299841	Pulsar	Fastest rotating neutron star known
PSR B1620-26 A	0.00003737243	Pulsar	Orbited by one of the oldest exoplanets known
HD 49798	0.0023	White dwarf	One of the hottest white dwarfs known,
GRW+70 8247	0.0047	White dwarf
BPM 37093	0.0057	White dwarf
IK Pegasi B	0.006	White dwarf	One of the closest stars to Earth that can possibly become a Type Ia supernova.
Sirius B	0.0079	White dwarf	Closest known white dwarf
Earth (for comparison)	0.00916	Rocky planet	Reported for reference
AR Scorpii	0.01	White dwarf	Only known white dwarf pulsar
DN Draconis	0.01	White dwarf
Van Maanen 2	0.011	White dwarf
Procyon B	0.0124	White dwarf
ESO 439-26	0.0126	White dwarf	Least luminous white dwarf known
WD 1145+017	0.02	White dwarf
NGC 3132 Central Star	0.0323	Proto-white dwarf	Has an A-type star companion.
KPD 0005+5106	0.055	White dwarf	One of the hottest white dwarfs known
PSR J0348+0432 B	0.0651	White dwarf
TMTS J052610.43+593445.1	0.0659	B type subdwarf	Smallest known non-degenerate star.
[MCG2003] Sex A PN 1 Central Star	0.079	O type subdwarf
CWISE J124909.08+362116.0	0.08	Brown dwarf or red dwarf	A hypervelocity star.
Epsilon Indi Ba	0.08	Brown dwarf
Epsilon Indi Bb	0.082	Brown dwarf
Luhman 16A	0.085	Brown dwarf	Nearest brown dwarf system to the Sun.
EBLM J0555-57Ab	0.0862	Red dwarf	Commonly known as the lower limit for main sequence stars.
SSSPM J0829-1309	0.088	Red dwarf
WISE 0855-0714	0.09	Brown dwarf	The coolest star known (temperature very similar to Earth).
2MASS 0939-2448	0.09	Brown dwarf
SCR 1845-6357 B	0.096	Brown dwarf
SCR 1845-6357 A	0.096	Red dwarf
Jupiter (for comparison)	0.1	Gas giant planet	Reported for reference
CoRoT-3b	0.1	Brown dwarf
HD 114762 B	0.1	Red dwarf
R Aquarii B	0.1	White dwarf
2MASS J0523-1403	0.101	Red dwarf	Coolest and least massive main sequence star known
LHS 2924	0.103	Red dwarf
Luhman 16B	0.104	Brown dwarf	Nearest brown dwarf system to the Sun.
2MASS J04285096-2253227	0.1095	Red dwarf
DX Cancri	0.11	Red dwarf
LHS 292	0.11	Red dwarf
TVLM 513-46546	0.11	Red dwarf
Gliese 229B	0.112	Brown dwarf
OGLE-TR-122B	0.116	Red dwarf
VB 10	0.1183	Red dwarf
TRAPPIST-1	0.1192	Red dwarf	Orbited by at least 7 confirmed Earth-sized rocky exoplanets, at least 3 are potentially habitable.
Teegarden's star	0.12	Red dwarf	Has 2 potentially habitable exoplanets.
LHS 2090	0.12	Red dwarf
VB 8	0.1214	Red dwarf
SPECULOOS-3	0.123	Red dwarf
CFBDSIR 1458+10B	0.13	Brown dwarf
Teide 1	0.13	Brown dwarf
Gliese 412B	0.13	Red dwarf
Wolf 359	0.145	Red dwarf
NN Serpentis B	0.15	Red dwarf
CFBDSIR 1458+10A	0.15	Brown dwarf
Proxima Centauri	0.1542	Red dwarf	Closest star to Sun.
UV Ceti	0.16	Red dwarf
BL Ceti	0.167	Red dwarf
YZ Ceti	0.168	Red dwarf
UY Sextantis	0.17	B type subdwarf	A B type subdwarf star is a star with temperatures similar to B type main sequence stars but are significantly smaller and less luminous.
Cha 110913-773444	0.18	Brown dwarf	One of the least massive stars known
HW Virginis	0.183	B type subdwarf
Barnard's star	0.187	Red dwarf
Ross 248	0.19	Red dwarf	Will become closest star to Sun about 35000 years later
Ross 128	0.1967	Red dwarf
Ross 154	0.2	Red dwarf
Kepler-70	0.2	B type subdwarf
Wolf 227	0.2	Red dwarf
RR Caeli	0.203	Red dwarf
Gliese 1214	0.204	Red dwarf
LHS 1140	0.2055	Red dwarf
CT Chamaeleontis B	0.22	Brown dwarf	One of the least massive stars known
NGC 5882 Central Star	0.227	Proto-white dwarf
Fomalhaut C	0.23	Red dwarf
OTS 44	0.23	Brown dwarf	One of the least massive stars known
CM Draconis B	0.2396	Red dwarf
2M1207A	0.25	Brown dwarf
CM Draconis A	0.2529	Red dwarf
DG Canum Venaticorum	0.2529	Red dwarf
55 Cancri B	0.27	Red dwarf
Kapteyn's star	0.29	Red dwarf
Gliese 581	0.3	Red dwarf
Wolf 1061	0.319	Red dwarf
Gliese 1	0.33	Red dwarf
Luyten's star	0.35	Red dwarf
Kruger 60A	0.35	Red dwarf
Struve 2398A	0.354	Red dwarf
Z Andromedae B	0.36	White dwarf	Largest and most luminous white dwarf known
EV Lacertae	0.36	Red dwarf
AT Microscopii B	0.37	Red dwarf
Regulus C	0.37	Red dwarf
Groombridge 34A	0.38	Red dwarf
Lalande 21185	0.393	Red dwarf
AT Microscopii A	0.41	Red dwarf
AD Leonis	0.423	Red dwarf
Gliese 436	0.432	Red dwarf
WR 93b	0.44	Wolf-rayet star
BAT99-123	0.47	Wolf-rayet star	Located in the Large Magellanic Cloud
Lacaille 9352	0.473	Red dwarf
Kepler-1 B	0.5	Red dwarf
Sun (for comparison)	1	G type main sequence star	Reported for reference