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
CWISE J1249+3621	1,715-2,320 [1]	sdL1	408
2MASS J0523-1403	1,939 [2]	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 [3]	S3,4–S5,8	3,100±300
LL Pegasi	1,800 [4]	C	4,200
RW Leonis Minoris	1,800 [5]	C4,3 [6]	1,053 [7]
V Coronae Borealis	1,800 [8]	C6,2e_MS3 [9]	2,100 [8]
V384 Persei	1,820 [10]	N
T Draconis	1,850 [10]	C6,2e
V346 Puppis	1,875 [10]	C
Leo A 22	1,900 [11]	C	2,600,000
S Aurigae	1,940 [10]	C-N5+
V1426 Cygni	1,975 [10]	C7,2e
Sextans A 20	2,000 [12]	C	4,310,000
Leo A 226	2,000 [13]	C	2,600,000
Sextans A 100	2,000 [14]	C	4,310,000
IRC +30374	2,000 [15]	C	3,900
IRC +60144	2,000 [16]	C	3,400
CZ Hydrae	2,000 [17]	C	7,200
SS Virginis	2,000 [18]	C-N4.5	2,100

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	[19]
WISE 0336-0143B [20]	295±10 [21]	Y1?	32.7 [22]	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 [23] Might be a later spectral type.
WISE J0830+2837	300-350 [24]	>Y1 [22]	26.87 [22]	uncertain parallax and spectral type is an estimate
CWISEP 0238-1332	367±79 [22]	>Y1	58.66	uncertain parallax and spectral type is an estimate
CWISEP 0402-2651	367±79 [22]	>Y1	39.53	uncertain parallax and spectral type is an estimate
WISEU 0503-5648 [22]	367±79	>Y1	33.18	spectral type is an estimate
CWISEP 0940+5233 [22]	367±79	>Y1	43.49	uncertain parallax and spectral type is an estimate
WISEA 1257+7153 [22]	367±79	>Y1	54.18	spectral type is an estimate
CWISEP J1446−2317 [22]	367±79	>Y1	37.75	uncertain parallax and spectral type is an estimate
WISEA 1930-2059 [22]	367±79	>Y1	30.67	spectral type is an estimate
CWISEP 1935-1546 [22]	367±79	>Y1	47.06	spectral type is an estimate
CWISEP 2230+2549 [22]	367±79	>Y1	52.44	uncertain parallax and spectral type is an estimate
CWISEP 2256+4002 [22]	367±79	>Y1	32.04	spectral type is an estimate
WISE 0825+2805 [22]	376±88	Y0.5	21.37
WD 0806-661B [22]	377±88	Y1	62.80	spectral type is an estimate
WISE 0350-5658 [22]	388±88	Y1	18.49
WISE J2354+0240 [22]	388±88	Y1	24.97
WISE 2209+2711 [22]	389±88	Y0:	20.17
WISE 0647-6232 [22]	393±88	Y1	32.78
WISEPA 1541-2250 [22]	395±88	Y1	19.54
WISE 1828+2650	406±88 [22]	Y2V [25]	32.5	Temperature could be lower. If it is a binary, its components could be as cold as about 275-350 K. [26]
WISE 0535-7500 [22]	410±88	>=Y1:	47.48
WISE 1405+5534	411±88 [22]	Y0.5(pec?) [22]	20.62
CWISEP 0321+6932 [22]	412±79	Y0.5	47.61	spectral type is an estimate
WISE 1639-6847 [22]	412±88	Y0pec	14.85
CWISEP 2356-4814 [22]	412±79	Y0.5	56.62	spectral type is an estimate
WISE 0336-0143A [20]	440±24 [27]	Y0 [22]	32.7 [22]
WISEPA 1738+2732 [22]	450±88	Y0	24.92
WISEPA 0410+1502 [22]	451±88	Y0	21.56
WISE 2220-3628 [22]	452±88	Y0	34.15
WISE 1534-1043	453±77 [28]	sdY?	53	possibly halo brown dwarf
WISE J1206+8401 [22]	454±88	Y0	38.51
WISE 0146+4234B [22]	460±79	Y0	63.09
WISEA 0302-5817 [22]	460±79	Y0:	54.45
CWISEP 0634+5049 [22]	460±79	Y0	52.61	spectral type is an estimate
CWISEP 0859+5349 [22]	460±79	Y0	60.62	spectral type is an estimate
CWISE 0925-4720 [22]	460±79	Y0	34.96	spectral type is an estimate
CWISEP 0938+0634 [22]	460±79	Y0	61.31	uncertain parallax and spectral type is an estimate
CWISEP J1047+5457 [22]	460±79	Y0	43.37	spectral type is an estimate
CWISE 1121-6232 [22]	460±79	Y0	33.69	spectral type is an estimate
WISEA J1141−3326 [22]	460±79	Y0	31.36
WISE 1217+1626 B	460±79 [22]	Y0-0.5	33
CWISE 1531-3306 [22]	460±79	Y0	55.37	spectral type is an estimate
WISENF 1936+0408 [22]	460±79	Y0	28.64	spectral type is an estimate
CWISEP 2011-4812 [22]	460±79	Y0	45.94	spectral type is an estimate
WISEA 2243-1458 [22]	460±79	Y0	47,75	spectral type is an estimate
WISE 1112-3857 [22]	461±88	T9	31.79
WISE 0734-7157 [22]	462±88	Y0	43.78
WISE 0713-2917 [22]	464±88	Y0	29.84
WISEPC 2056+1459 [22]	464±88	Y0	23.16
WISE J0304−2705 [22]	465±88	Y0~pec	44.62
WISE 0359-5401	467+16 −18 [29]	Y0 [22]	44.31 [22]
WISE 0943+3607 [22]	468±88	T9.5	33.59
WISE 0833+0052 [22]	472±88	(sd)T9	40.92	possible subdwarf
WISE 1542+2230 [22]	472±88	T9.5	38.69
WISE 0811-8051 [22]	479±88	T9.5:	32.91
WISEPA 2134-7137 [22]	481±88	T9~pec	29.73	possible subdwarf
WISE 2212-6931 [22]	487±88	T9	40.47
WISEPA 0751-7634 [22]	492±88	T9	33.32
WISE 0335+4310 [22]	492±88	T9	38.46

See also

• List of most massive stars
• List of hottest stars
• List of largest stars

References

1. Burgasser, Adam (2024). "Discovery of a Hypervelocity L Subdwarf at the Star/Brown Dwarf Mass Limit". arXiv: 2407.08578 [Astrophysics].
2. Filippazzo, Joseph C.; Rice, Emily L.; Faherty, Jacqueline; Cruz, Kelle L.; Van Gordon, Mollie M.; Looper, Dagny L. (2015-09-10). "Fundamental Parameters and Spectral Energy Distributions of Young and Field Age Objects with Masses Spanning the Stellar to Planetary Regime". The Astrophysical Journal. 810 (2): 158. arXiv: 1508.01767 . Bibcode:2015ApJ...810..158F. doi:10.1088/0004-637X/810/2/158. ISSN   1538-4357.
3. Ramstedt, S.; Olofsson, H. (2014-06-01). "The 12CO/13CO ratio in AGB stars of different chemical type - Connection to the 12C/13C ratio and the evolution along the AGB". Astronomy & Astrophysics. 566: A145. arXiv: 1405.6404 . doi:10.1051/0004-6361/201423721. ISSN   0004-6361.
4. Massalkhi, Sarah (2019). "Study of CS, SiO, and SiS abundances in carbon star envelopes: Assessing their role as gas-phase precursors of dust". Astronomy & Astrophysics. 628: A62. arXiv: 1906.09461 . doi:10.1051/0004-6361/201935069.
5. Ramstedt, S.; Olofsson, H. (2014-06-01). "The 12CO/13CO ratio in AGB stars of different chemical type - Connection to the 12C/13C ratio and the evolution along the AGB". Astronomy & Astrophysics. 566: A145. arXiv: 1405.6404 . doi:10.1051/0004-6361/201423721. ISSN   0004-6361.
6. Cohen, M. (1979-03-01). "Circumstellar envelopes and the evolution of carbon stars". Monthly Notices of the Royal Astronomical Society. 186 (4): 837–852. Bibcode:1979MNRAS.186..837C. doi: 10.1093/mnras/186.4.837 . ISSN   0035-8711.
7. Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Demleitner, M.; Andrae, R. (2021-03-01). "Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3". The Astronomical Journal. 161 (3): 147. arXiv: 2012.05220 . Bibcode:2021AJ....161..147B. doi: 10.3847/1538-3881/abd806 . ISSN   0004-6256. Data about this star can be seen here.
8. Danilovich, T.; Teyssier, D.; Justtanont, K.; Olofsson, H.; Cerrigone, L.; Bujarrabal, V.; Alcolea, J.; Cernicharo, J.; Castro-Carrizo, A.; García-Lario, P.; Marston, A. (2015-09-01). "New observations and models of circumstellar CO line emission of AGB stars in the Herschel SUCCESS programme". Astronomy & Astrophysics. 581: A60. arXiv: 1506.09065 . Bibcode:2015A&A...581A..60D. doi:10.1051/0004-6361/201526705. ISSN   0004-6361.
9. "V CrB". SIMBAD . Centre de données astronomiques de Strasbourg.
10. Bergeat, J.; Chevallier, L. (2005). "The mass loss of C-rich giants". Astronomy and Astrophysics. 429: 235–246. arXiv: astro-ph/0601366 . Bibcode:2005A&A...429..235B. doi:10.1051/0004-6361:20041280. S2CID   56424665.
11. Jones, Olivia (2017). "Near-infrared Stellar Populations in the Metal-poor, Dwarf Irregular Galaxies Sextans a and Leo A". The Astrophysical Journal. 854 (2): 117. arXiv: 1712.06594 . doi: 10.3847/1538-4357/aaa542 .
12. Jones, Olivia (2017). "Near-infrared Stellar Populations in the Metal-poor, Dwarf Irregular Galaxies Sextans a and Leo A". The Astrophysical Journal. 854 (2): 117. arXiv: 1712.06594 . doi: 10.3847/1538-4357/aaa542 .
13. Jones, Olivia (2017). "Near-infrared Stellar Populations in the Metal-poor, Dwarf Irregular Galaxies Sextans a and Leo A". The Astrophysical Journal. 854 (2): 117. arXiv: 1712.06594 . doi: 10.3847/1538-4357/aaa542 .
14. Jones, Olivia (2017). "Near-infrared Stellar Populations in the Metal-poor, Dwarf Irregular Galaxies Sextans a and Leo A". The Astrophysical Journal. 854 (2): 117. arXiv: 1712.06594 . doi: 10.3847/1538-4357/aaa542 .
15. Massalkhi, Sarah (2019). "Study of CS, SiO, and SiS abundances in carbon star envelopes: Assessing their role as gas-phase precursors of dust". Astronomy & Astrophysics. 628: A62. arXiv: 1906.09461 . doi:10.1051/0004-6361/201935069.
16. Massalkhi, Sarah (2019). "Study of CS, SiO, and SiS abundances in carbon star envelopes: Assessing their role as gas-phase precursors of dust". Astronomy & Astrophysics. 628: A62. arXiv: 1906.09461 . doi:10.1051/0004-6361/201935069.
17. Siderud, Emelie (2020). "Dust emmision modeling of AGB stars" (PDF). Uppsala University. Uppsala, Sweden. Retrieved 2025-03-31.
18. Siderud, Emelie (2020). "Dust emmision modeling of AGB stars" (PDF). Uppsala University. Uppsala, Sweden. Retrieved 2025-03-31.
19. Luhman, K. L.; Tremblin, P.; Alves de Oliveira, C.; Birkmann, S. M.; Baraffe, I.; Chabrier, G.; Manjavacas, E.; Parker, R. J.; Valenti, J. (2023-12-05). "JWST/NIRSpec Observations of the Coldest Known Brown Dwarf*". The Astronomical Journal. 167 (1): 5. arXiv: 2311.17316 . Bibcode:2024AJ....167....5L. doi: 10.3847/1538-3881/ad0b72 . ISSN   0004-6256.
20. Calissendorff, Per; De Furio, Matthew; Meyer, Michael; Albert, Loïc; Aganze, Christian; Ali-Dib, Mohamad; Bardalez Gagliuffi, Daniella C.; Baron, Frederique; Beichman, Charles A.; Burgasser, Adam J.; Cushing, Michael C.; Faherty, Jacqueline Kelly; Fontanive, Clémence; Gelino, Christopher R.; Gizis, John E. (2023-04-01). "JWST/NIRCam Discovery of the First Y+Y Brown Dwarf Binary: WISE J033605.05-014350.4". The Astrophysical Journal. 947 (2): L30. arXiv: 2303.16923 . Bibcode:2023ApJ...947L..30C. doi: 10.3847/2041-8213/acc86d . ISSN   0004-637X.
21. Leggett, S. K.; Tremblin, Pascal (25 Sep 2023). "The First Y Dwarf Data From JWST Show That Dynamic and Diabatic Processes Regulate Cold Brown Dwarf Atmospheres". The Astrophysical Journal. 959 (2): 86. arXiv: 2309.14567 . Bibcode:2023ApJ...959...86L. doi: 10.3847/1538-4357/acfdad .
22. Kirkpatrick, J. Davy; Gelino, Christopher R.; Faherty, Jacqueline K.; Meisner, Aaron M.; Caselden, Dan; Schneider, Adam C.; Marocco, Federico; Cayago, Alfred J.; Smart, R. L.; Eisenhardt, Peter R.; Kuchner, Marc J.; Wright, Edward L.; Cushing, Michael C.; Allers, Katelyn N.; Gagliuffi, Daniella C. Bardalez (2021-03-01). "The Field Substellar Mass Function Based on the Full-sky 20-pc Census of 525 L, T, and Y Dwarfs". The Astrophysical Journal Supplement Series. 253 (1): 7. arXiv: 2011.11616 . Bibcode:2021ApJS..253....7K. doi: 10.3847/1538-4365/abd107 . ISSN   0067-0049. S2CID   227126954.
23. Kirkpatrick, J. Davy; Gelino, Christopher R.; Cushing, Michael C.; Mace, Gregory N.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Eisenhardt, Peter R.; McLean, Ian S.; Mainzer, Amanda K.; Burgasser, Adam J.; Tinney, C. G.; Parker, Stephen; Salter, Graeme (2012-07-01). "Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function". The Astrophysical Journal. 753 (2): 156. arXiv: 1205.2122 . Bibcode:2012ApJ...753..156K. doi: 10.1088/0004-637X/753/2/156 . ISSN   0004-637X.
24. Bardalez Gagliuffi, Daniella C.; Faherty, Jacqueline K.; Schneider, Adam C.; Meisner, Aaron; Caselden, Dan; Colin, Guillaume; Goodman, Sam; Kirkpatrick, J. Davy; Kuchner, Marc; Gagné, Jonathan; Logsdon, Sarah E.; Burgasser, Adam J.; Allers, Katelyn; Debes, John; Wisniewski, John (2020-06-01). "WISEA J083011.95+283716.0: A Missing Link Planetary-mass Object". The Astrophysical Journal. 895 (2): 145. arXiv: 2004.12829 . Bibcode:2020ApJ...895..145B. doi: 10.3847/1538-4357/ab8d25 . ISSN   0004-637X.
25. Beichman, Charles A.; Gelino, Christopher R.; Kirkpatrick, J. Davy; Barman, Travis S.; Marsh, Kenneth A.; Cushing, Michael C.; Wright, E. L. (2013-01-29). "The Coldest Brown Dwarf (Or Free Floating Planet)?: The Y Dwarf WISE 1828+2650". The Astrophysical Journal. 764 (1): 101. arXiv: 1301.1669 . Bibcode:2013ApJ...764..101B. doi:10.1088/0004-637X/764/1/101. ISSN   0004-637X. S2CID   118575478.
26. Cushing, Michael C.; Schneider, Adam C.; Kirkpatrick, J. Davy; Morley, Caroline V.; Marley, Mark S.; Gelino, Christopher R.; Mace, Gregory N.; Wright, Edward L.; Eisenhardt, Peter R.; Skrutskie, Michael F.; Marsh, Kenneth A. (2021-10-01). "An Improved Near-infrared Spectrum of the Archetype Y Dwarf WISEP J182831.08+265037.8". The Astrophysical Journal. 920 (1): 20. arXiv: 2107.00506 . Bibcode:2021ApJ...920...20C. doi: 10.3847/1538-4357/ac12cb . ISSN   0004-637X.
27. Leggett, S. K.; Tremblin, Pascal (25 Sep 2023). "The First Y Dwarf Data From JWST Show That Dynamic and Diabatic Processes Regulate Cold Brown Dwarf Atmospheres". The Astrophysical Journal. 959 (2): 86. arXiv: 2309.14567 . Bibcode:2023ApJ...959...86L. doi: 10.3847/1538-4357/acfdad .
28. Meisner, Aaron M.; Leggett, S. K.; Logsdon, Sarah E.; Schneider, Adam C.; Tremblin, Pascal; Phillips, Mark (2023-08-01). "Exploring the Extremes: Characterizing a New Population of Old and Cold Brown Dwarfs". The Astronomical Journal. 166 (2): 57. arXiv: 2301.09817 . Bibcode:2023AJ....166...57M. doi: 10.3847/1538-3881/acdb68 . ISSN   0004-6256.
29. Beiler, Samuel A.; Cushing, Michael C.; Kirkpatrick, J. Davy; Schneider, Adam C.; Mukherjee, Sagnick; Marley, Mark S. (2023-07-01). "The First JWST Spectral Energy Distribution of a Y Dwarf". The Astrophysical Journal. 951 (2): L48. arXiv: 2306.11807 . Bibcode:2023ApJ...951L..48B. doi: 10.3847/2041-8213/ace32c . ISSN   0004-637X.