List of coolest stars
This is a list of coolest stars and brown dwarfs discovered, arranged by decreasing temperature. The stars with temperatures lower than 2,000 K are included.
Coolest [main sequence] stars
Include stars with temperatures lower than 2,500 Kelvin.| Star name | Temperature | Spectral type | Distance | Notes |
| CWISE J1249+3621 | 1,715-2,320 | sdL1 | 408 | |
| 2MASS J0523-1403 | 1,939 | L2.5V | 41.62 | The coolest main sequence star known as of 2023. |
Coolest [giant star]s
Include giants with temperatures lower than 2,000 Kelvin.| Star name | Temperature | Spectral type | Distance | Notes |
| S Cassiopeiae | 1,800 | S3,4–S5,8 | ||
| LL Pegasi | 1,800 | C | 4,200 | |
| RW Leonis Minoris | 1,800 | C4,3 | 1,053 | |
| 1,800 | C6,2e_MS3 | |||
| V384 Persei | 1,820 | N | ||
| T Draconis | 1,850 | C6,2e | ||
| V346 Puppis | 1,875 | C | ||
| Leo A 22 | 1,900 | C | 2,600,000 | |
| S Aurigae | 1,940 | C-N5+ | ||
| V1426 Cygni | 1,975 | C7,2e | - | |
| Sextans A 20 | 2,000 | C | 4,310,000 | |
| Leo A 226 | 2,000 | C | 2,600,000 | |
| Sextans A 100 | 2,000 | C | 4,310,000 | |
| IRC +30374 | 2,000 | C | 3,900 | |
| IRC +60144 | 2,000 | C | 3,400 | |
| CZ Hydrae | 2,000 | C | 7,200 | |
| SS Virginis | 2,000 | C-N4.5 | 2,100 |
Coolest brown dwarfs and rogue planets
Include brown dwarfs with temperatures lower than 500 Kelvin.| Star name | Temperature | Spectral type | Distance | Notes |
| 285 | Y4 | |||
| WISE 0336-0143B | Y1? | 32.7 | spectral type is not yet published, but should be around Y1 if we assume MIRI F480M is similar to W2 and by using Figure 13 from Kirkpatrick et al. 2012 Might be a later spectral type. | |
| WISE J0830+2837 | 300-350 | >Y1 | 26.87 | uncertain parallax and spectral type is an estimate |
| CWISEP 0238-1332 | >Y1 | 58.66 | uncertain parallax and spectral type is an estimate | |
| CWISEP 0402-2651 | >Y1 | 39.53 | uncertain parallax and spectral type is an estimate | |
| WISEU 0503-5648 | >Y1 | 33.18 | spectral type is an estimate | |
| CWISEP 0940+5233 | >Y1 | 43.49 | uncertain parallax and spectral type is an estimate | |
| WISEA 1257+7153 | >Y1 | 54.18 | spectral type is an estimate | |
| CWISEP J1446−2317 | >Y1 | 37.75 | uncertain parallax and spectral type is an estimate | |
| WISEA 1930-2059 | >Y1 | 30.67 | spectral type is an estimate | |
| CWISEP 1935-1546 | >Y1 | 47.06 | spectral type is an estimate | |
| CWISEP 2230+2549 | >Y1 | 52.44 | uncertain parallax and spectral type is an estimate | |
| CWISEP 2256+4002 | >Y1 | 32.04 | spectral type is an estimate | |
| WISE 0825+2805 | Y0.5 | 21.37 | ||
| WD 0806-661B | Y1 | 62.80 | spectral type is an estimate | |
| WISE 0350-5658 | Y1 | 18.49 | ||
| WISE J2354+0240 | Y1 | 24.97 | ||
| WISE 2209+2711 | Y0: | 20.17 | ||
| WISE 0647-6232 | Y1 | 32.78 | ||
| WISEPA 1541-2250 | Y1 | 19.54 | ||
| WISE 1828+2650 | Y2V | 32.5 | Temperature could be lower. If it is a binary, its components could be as cold as about 275-350 K. | |
| WISE 0535-7500 | >=Y1: | 47.48 | ||
| WISE 1405+5534 | Y0.5 | 20.62 | ||
| CWISEP 0321+6932 | Y0.5 | 47.61 | spectral type is an estimate | |
| WISE 1639-6847 | Y0pec | 14.85 | ||
| CWISEP 2356-4814 | Y0.5 | 56.62 | spectral type is an estimate | |
| WISE 0336-0143A | Y0 | 32.7 | ||
| WISEPA 1738+2732 | Y0 | 24.92 | ||
| WISEPA 0410+1502 | Y0 | 21.56 | ||
| WISE 2220-3628 | Y0 | 34.15 | ||
| WISE 1534-1043 | sdY? | 53 | possibly halo brown dwarf | |
| WISE J1206+8401 | Y0 | 38.51 | ||
| WISE 0146+4234B | Y0 | 63.09 | ||
| WISEA 0302-5817 | Y0: | 54.45 | ||
| CWISEP 0634+5049 | Y0 | 52.61 | spectral type is an estimate | |
| CWISEP 0859+5349 | Y0 | 60.62 | spectral type is an estimate | |
| CWISE 0925-4720 | Y0 | 34.96 | spectral type is an estimate | |
| CWISEP 0938+0634 | Y0 | 61.31 | uncertain parallax and spectral type is an estimate | |
| CWISEP J1047+5457 | Y0 | 43.37 | spectral type is an estimate | |
| CWISE 1121-6232 | Y0 | 33.69 | spectral type is an estimate | |
| WISEA J1141−3326 | Y0 | 31.36 | ||
| WISE 1217+1626 B | Y0-0.5 | 33 | ||
| CWISE 1531-3306 | Y0 | 55.37 | spectral type is an estimate | |
| WISENF 1936+0408 | Y0 | 28.64 | spectral type is an estimate | |
| CWISEP 2011-4812 | Y0 | 45.94 | spectral type is an estimate | |
| WISEA 2243-1458 | Y0 | 47,75 | spectral type is an estimate | |
| WISE 1112-3857 | T9 | 31.79 | ||
| WISE 0734-7157 | Y0 | 43.78 | ||
| WISE 0713-2917 | Y0 | 29.84 | ||
| WISEPC 2056+1459 | Y0 | 23.16 | ||
| WISE J0304−2705 | Y0~pec | 44.62 | ||
| WISE 0359-5401 | Y0 | 44.31 | ||
| WISE 0943+3607 | T9.5 | 33.59 | ||
| WISE 0833+0052 | T9 | 40.92 | possible subdwarf | |
| WISE 1542+2230 | T9.5 | 38.69 | ||
| WISE 0811-8051 | T9.5: | 32.91 | ||
| WISEPA 2134-7137 | T9~pec | 29.73 | possible subdwarf | |
| WISE 2212-6931 | T9 | 40.47 | ||
| WISEPA 0751-7634 | T9 | 33.32 | ||
| WISE 0335+4310 | T9 | 38.46 |