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 nameTemperature (K) Spectral typeDistance NotesCWISE J1249+36211,715-2,320 sdL14082MASS J0523-14031,939L2.5V41.62The coolest main sequence star known as of 2023.
Coolest giant stars Include giants with temperatures lower than 2,000 Kelvin.
Star nameTemperature (K) Spectral typeDistance NotesS Cassiopeiae1,800S3,4–S5,8LL Pegasi1,800 C4,200RW Leonis Minoris1,800C4,31,053 Data about this star can be seen here.1,800C6,2e_MS3V384 Persei1,820NT Draconis1,850C6,2eV346 Puppis1,875CLeo A 221,900 C2,600,000S Aurigae1,940C-N5+V1426 Cygni1,975C7,2eSextans A 202,000C4,310,000Leo A 2262,000C2,600,000Sextans A 1002,000C4,310,000IRC +303742,000C3,900IRC +601442,000C3,400CZ Hydrae2,000 C7,200SS Virginis2,000C-N4.52,100
Coolest brown dwarfs
Include brown dwarfs with temperatures lower than 500 Kelvin. Star nameTemperature (K) Spectral typeDistance Notes285Y4WISE 0336-0143BY1?32.7spectral 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+2837300-350>Y126.87uncertain parallax and spectral type is an estimateCWISEP 0238-1332>Y158.66uncertain parallax and spectral type is an estimateCWISEP 0402-2651>Y139.53uncertain parallax and spectral type is an estimateWISEU 0503-5648>Y133.18spectral type is an estimateCWISEP 0940+5233>Y143.49uncertain parallax and spectral type is an estimateWISEA 1257+7153>Y154.18spectral type is an estimateCWISEP J1446−2317>Y137.75uncertain parallax and spectral type is an estimateWISEA 1930-2059>Y130.67spectral type is an estimateCWISEP 1935-1546>Y147.06spectral type is an estimateCWISEP 2230+2549>Y152.44uncertain parallax and spectral type is an estimateCWISEP 2256+4002>Y132.04spectral type is an estimateWISE 0825+2805Y0.521.37WD 0806-661BY162.80spectral type is an estimateWISE 0350-5658Y118.49WISE J2354+0240Y124.97WISE 2209+2711Y0:20.17WISE 0647-6232Y132.78WISEPA 1541-2250Y119.54WISE 1828+2650Y2V32.5Temperature could be lower. If it is a binary, its components could be as cold as about 275-350 K.WISE 0535-7500>=Y1: 47.48WISE 1405+5534Y0.5(pec?)20.62CWISEP 0321+6932Y0.547.61spectral type is an estimateWISE 1639-6847Y0pec14.85CWISEP 2356-4814Y0.556.62spectral type is an estimateWISE 0336-0143AY032.7WISEPA 1738+2732Y024.92WISEPA 0410+1502Y021.56WISE 2220-3628Y034.15WISE 1534-1043sdY?53possibly halo brown dwarfWISE J1206+8401Y038.51WISE 0146+4234BY063.09WISEA 0302-5817Y0:54.45CWISEP 0634+5049Y052.61spectral type is an estimateCWISEP 0859+5349Y060.62spectral type is an estimateCWISE 0925-4720Y034.96spectral type is an estimateCWISEP 0938+0634Y061.31uncertain parallax and spectral type is an estimateCWISEP J1047+5457Y043.37spectral type is an estimateCWISE 1121-6232Y033.69spectral type is an estimateWISEA J1141−3326Y031.36WISE 1217+1626 BY0-0.533CWISE 1531-3306Y055.37spectral type is an estimateWISENF 1936+0408Y028.64spectral type is an estimateCWISEP 2011-4812Y045.94spectral type is an estimateWISEA 2243-1458Y047,75spectral type is an estimateWISE 1112-3857T931.79WISE 0734-7157Y043.78WISE 0713-2917Y029.84WISEPC 2056+1459Y023.16WISE J0304−2705Y0~pec44.62WISE 0359-5401Y044.31WISE 0943+3607T9.533.59WISE 0833+0052(sd)T940.92possible subdwarfWISE 1542+2230T9.538.69WISE 0811-8051T9.5:32.91WISEPA 2134-7137T9~pec29.73possible subdwarfWISE 2212-6931T940.47WISEPA 0751-7634T933.32WISE 0335+4310T938.46
See also List of most massive stars List of hottest stars List of largest stars
References