List of coolest stars

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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.

Kirkpatrick et al. 2021 has a more complete list of nearby objects with a temperature below 2,400 K. Objects with a temperature below 500 K from this paper were included in this list.

List

Star name Temperature

(K)

Spectral type Distance (light years) Notes
WISE 0855–0714 285 Y4 7.426±0.039
WISE 0336-0143B 295±10 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.
WISEA 0830+2837 300-350 >Y1 26.87 uncertain parallax and spectral type is an estimate
CWISEP 0238-1332 367±79 >Y1 58.66 uncertain parallax and spectral type is an estimate
CWISEP 0402-2651 367±79 >Y1 39.53 uncertain parallax and spectral type is an estimate
WISEU 0503-5648 367±79 >Y1 33.18 spectral type is an estimate
CWISEP 0940+5233 367±79 >Y1 43.49 uncertain parallax and spectral type is an estimate
WISEA 1257+7153 367±79 >Y1 54.18 spectral type is an estimate
CWISEP 1446-2317 367±79 >Y1 37.75 uncertain parallax and spectral type is an estimate
WISEA 1930-2059 367±79 >Y1 30.67 spectral type is an estimate
CWISEP 1935-1546 367±79 >Y1 47.06 spectral type is an estimate
CWISEP 2230+2549 367±79 >Y1 52.44 uncertain parallax and spectral type is an estimate
CWISEP 2256+4002 367±79 >Y1 32.04 spectral type is an estimate
CFBDSIR 1458+10B 370 Y0 104
WISE 0825+2805 376±88 Y0.5 21.37
WD 0806-661B 377±88 Y1 62.80 spectral type is an estimate
WISE 0350-5658 388±88 Y1 18.49
WISEA 2354+0240 388±88 Y1 24.97
WISE 2209+2711 389±88 Y0: 20.17
WISE 0647-6232 393±88 Y1 32.78
WISEPA 1541-2250 395±88 Y1 19.54
WISE 1828+2650 406±88 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 410±88 >=Y1: 47.48
WISE 1405+5534 411±88 Y0.5(pec?) 20.62
CWISEP 0321+6932 412±79 Y0.5 47.61 spectral type is an estimate
WISE 1639-6847 412±88 Y0pec 14.85
CWISEP 2356-4814 412±79 Y0.5 56.62 spectral type is an estimate
WISE 0336-0143A 440±24 Y0 32.7
WISEPA 1738+2732 450±88 Y0 24.92
WISEPA 0410+1502 451±88 Y0 21.56
WISE 2220-3628 452±88 Y0 34.15
WISE 1534-1043 453±77 sdY? 53 possibly halo brown dwarf
WISE 1206+8401 454±88 Y0 38.51
WISE 0146+4234B 460±79 Y0 63.09
WISEA 0302-5817 460±79 Y0: 54.45
CWISEP 0634+5049 460±79 Y0 52.61 spectral type is an estimate
CWISEP 0859+5349 460±79 Y0 60.62 spectral type is an estimate
CWISE 0925-4720 460±79 Y0 34.96 spectral type is an estimate
CWISEP 0938+0634 460±79 Y0 61.31 uncertain parallax and spectral type is an estimate
CWISEP 1047+5457 460±79 Y0 43.37 spectral type is an estimate
CWISE 1121-6232 460±79 Y0 33.69 spectral type is an estimate
WISEA 1141-3326 460±79 Y0 31.36
WISE 1217+1626 B 460±79 Y0-0.5 33
CWISE 1531-3306 460±79 Y0 55.37 spectral type is an estimate
WISENF 1936+0408 460±79 Y0 28.64 spectral type is an estimate
CWISEP 2011-4812 460±79 Y0 45.94 spectral type is an estimate
WISEA 2243-1458 460±79 Y0 47,75 spectral type is an estimate
WISE 1112-3857 461±88 T9 31.79
WISE 0734-7157 462±88 Y0 43.78
WISE 0713-2917 464±88 Y0 29.84
WISEPC 2056+1459 464±88 Y0 23.16
WISE 0304-2705 465±88 Y0~pec 44.62
WISE 0359-5401 467+16
−18 		Y0 44.31
WISE 0943+3607 468±88 T9.5 33.59
WISE 0833+0052 472±88 (sd)T9 40.92 possible subdwarf
WISE 1542+2230 472±88 T9.5 38.69
WISE 0811-8051 479±88 T9.5: 32.91
WISEPA 2134-7137 481±88 T9~pec 29.73 possible subdwarf
WISE 2212-6931 487±88 T9 40.47
WISEPA 0751-7634 492±88 T9 33.32
WISE 0335+4310 492±88 T9 38.46
WISE 1217+1626 A 575 T8.5-9 33
UGPS J0521+3640 600–650 T8.5 26.7
2MASS 0939-2448 A/B 650 T8 17.4±0.4
2MASS 0415-0935 764 T8V 18.6±0.2
54 Piscium B 810 ± 50 T7.5V 36.32±0.02
2M 1237+6526 850 T6.5 46
2MASS J0348−6022 880 T7 27.2
SCR 1845-6357B 950 T6 13.050±0.008
Epsilon Indi Bb 993 T6 12.05
2MASS 0243-2453 1,050 T6 35±1
Cha 110913-773444 1,350 M9.5 529
Epsilon Indi Ba 1,353 T1-1.5 12.05
2MASS 0036+1821 1,650 L3.5 28.51±0.05
2MASS 1507-1627 1,650 L5 24.12±0.06
OTS 44 1,700 M9.5 554
GD 165 B 1,755 L4 109
S Cassiopeiae 1,800 S3,4–S5,8 3,100±300
V384 Persei 1,820 N
DENIS-P J1058.7−1548 1,850 L3 49
T Draconis 1,850 C6,2e
V346 Puppis 1,875 C
2MASS J0523-1403 1,939 L2.5V 41.62 The coolest main sequence star known as of 2023.
S Aurigae 1,940 C-N5+
V1426 Cygni 1,975 C7,2e

See also


References

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