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

(K)

Spectral type Distance (light years) Notes
2MASS J0523-1403 1,939[1] L2.5V 41.62 The coolest main sequence star known as of 2023.

Coolest giant stars

Include giants with temperatures lower than 2,000 Kelvin.

Star name Temperature

(K)

Spectral type Distance (light years) Notes
S Cassiopeiae 1,800[2] S3,4–S5,8 3,100±300
RW Leonis Minoris 1,800[3] C4,3[4] 1,053[5]
V Coronae Borealis 1,800[6] C6,2e_MS3[7] 2,100[6]
V384 Persei 1,820[8] N
T Draconis 1,850[8] C6,2e
V346 Puppis 1,875[8] C
S Aurigae 1,940[8] C-N5+
V1426 Cygni 1,975[8] C7,2e

Coolest brown dwarfs

Include brown dwarfs with temperatures lower than 500 Kelvin.

Star name Temperature

(K)

Spectral type Distance (light years) Notes
WISE 0855–0714 285 Y4 7.426±0.039 [9]
WISE 0336-0143B[10] 295±10[11] Y1? 32.7[12] 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[13] Might be a later spectral type.
WISEA 0830+2837 300-350[14] >Y1[12] 26.87[12] uncertain parallax and spectral type is an estimate
CWISEP 0238-1332 367±79[12] >Y1 58.66 uncertain parallax and spectral type is an estimate
CWISEP 0402-2651 367±79[12] >Y1 39.53 uncertain parallax and spectral type is an estimate
WISEU 0503-5648[12] 367±79 >Y1 33.18 spectral type is an estimate
CWISEP 0940+5233[12] 367±79 >Y1 43.49 uncertain parallax and spectral type is an estimate
WISEA 1257+7153[12] 367±79 >Y1 54.18 spectral type is an estimate
CWISEP J1446−2317[12] 367±79 >Y1 37.75 uncertain parallax and spectral type is an estimate
WISEA 1930-2059[12] 367±79 >Y1 30.67 spectral type is an estimate
CWISEP 1935-1546[12] 367±79 >Y1 47.06 spectral type is an estimate
CWISEP 2230+2549[12] 367±79 >Y1 52.44 uncertain parallax and spectral type is an estimate
CWISEP 2256+4002[12] 367±79 >Y1 32.04 spectral type is an estimate
WISE 0825+2805[12] 376±88 Y0.5 21.37
WD 0806-661B[12] 377±88 Y1 62.80 spectral type is an estimate
WISE 0350-5658[12] 388±88 Y1 18.49
WISEA 2354+0240[12] 388±88 Y1 24.97
WISE 2209+2711[12] 389±88 Y0: 20.17
WISE 0647-6232[12] 393±88 Y1 32.78
WISEPA 1541-2250[12] 395±88 Y1 19.54
WISE 1828+2650 406±88[12] Y2V[15] 32.5 Temperature could be lower. If it is a binary, its components could be as cold as about 275-350 K.[16]
WISE 0535-7500[12] 410±88 >=Y1: 47.48
WISE 1405+5534 411±88[12] Y0.5(pec?)[12] 20.62
CWISEP 0321+6932[12] 412±79 Y0.5 47.61 spectral type is an estimate
WISE 1639-6847[12] 412±88 Y0pec 14.85
CWISEP 2356-4814[12] 412±79 Y0.5 56.62 spectral type is an estimate
WISE 0336-0143A[10] 440±24[17] Y0[12] 32.7[12]
WISEPA 1738+2732[12] 450±88 Y0 24.92
WISEPA 0410+1502[12] 451±88 Y0 21.56
WISE 2220-3628[12] 452±88 Y0 34.15
WISE 1534-1043 453±77[18] sdY? 53 possibly halo brown dwarf
WISE 1206+8401[12] 454±88 Y0 38.51
WISE 0146+4234B[12] 460±79 Y0 63.09
WISEA 0302-5817[12] 460±79 Y0: 54.45
CWISEP 0634+5049[12] 460±79 Y0 52.61 spectral type is an estimate
CWISEP 0859+5349[12] 460±79 Y0 60.62 spectral type is an estimate
CWISE 0925-4720[12] 460±79 Y0 34.96 spectral type is an estimate
CWISEP 0938+0634[12] 460±79 Y0 61.31 uncertain parallax and spectral type is an estimate
CWISEP J1047+5457[12] 460±79 Y0 43.37 spectral type is an estimate
CWISE 1121-6232[12] 460±79 Y0 33.69 spectral type is an estimate
WISEA 1141-3326[12] 460±79 Y0 31.36
WISE 1217+1626 B 460±79[12] Y0-0.5 33
CWISE 1531-3306[12] 460±79 Y0 55.37 spectral type is an estimate
WISENF 1936+0408[12] 460±79 Y0 28.64 spectral type is an estimate
CWISEP 2011-4812[12] 460±79 Y0 45.94 spectral type is an estimate
WISEA 2243-1458[12] 460±79 Y0 47,75 spectral type is an estimate
WISE 1112-3857[12] 461±88 T9 31.79
WISE 0734-7157[12] 462±88 Y0 43.78
WISE 0713-2917[12] 464±88 Y0 29.84
WISEPC 2056+1459[12] 464±88 Y0 23.16
WISE 0304-2705[12] 465±88 Y0~pec 44.62
WISE 0359-5401 467+16
−18[19] 		Y0[12] 44.31[12]
WISE 0943+3607[12] 468±88 T9.5 33.59
WISE 0833+0052[12] 472±88 (sd)T9 40.92 possible subdwarf
WISE 1542+2230[12] 472±88 T9.5 38.69
WISE 0811-8051[12] 479±88 T9.5: 32.91
WISEPA 2134-7137[12] 481±88 T9~pec 29.73 possible subdwarf
WISE 2212-6931[12] 487±88 T9 40.47
WISEPA 0751-7634[12] 492±88 T9 33.32
WISE 0335+4310[12] 492±88 T9 38.46

See also


References

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