List of smallest stars
This is an incomplete list of the smallest known stars. Some information might be incorrect. Most of the stars in this list are within the Milky Way.
Smallest stars are mostly red dwarfs, brown dwarfs, white dwarfs and neutron stars. In the list, XTE J1739-285 might be an extremely rare quark star.
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 | A neutron star is a stellar remnant of a star from 8 to 20 solar masses. |
| 4U 1820-30 | 0.00001308035 | Pulsar | A pulsar is a highly magnetized, rapidly rotating neutron star or white dwarf. |
| PSR B1257+12 | 0.00001437401 | Pulsar | Coolest neutron star known. Has 3 exoplanets orbiting it. |
| Crab Pulsar | 0.00001437401 | Pulsar | 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 | Hosts one of the oldest exoplanets known |
| HD 49798 | 0.0023 | White dwarf | A white dwarf is a stellar remnant of a star below 8 solar masses. |
| 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 |
| 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 | 0.002 | White dwarf | |
| KPD 0005+5106 | 0.0059 | White dwarf | Hottest white dwarf known |
| PSR J0348+0432 B | 0.00651 | White dwarf | |
| Epsilon Indi Ba | 0.08 | Brown dwarf | A brown dwarf is a star-like object with a mass of 13 to 80 Jupiters. |
| 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 | A red dwarf is the smallest kind of star in the main sequence. |
| SSSPM J0829-1309 | 0.088 | Red dwarf | |
| WISE 0855-0714 | 0.09 | Brown dwarf | The coolest star known (temperature very similar to Earth. |
| Jupiter (for comparison) | 0.1 | Gas giant planet | Reported for reference |