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This is a list of astronomical objects with the spectral type Y. They are a mix of brown dwarfs and planetary-mass objects. They are the coldest such objects in interstellar space and have a temperature around below 500 Kelvin (227°C; 440°F). Only a few are known due to their faint nature. The list is sorted after distance.

List of Y-dwarfs
Name spectral type [1] Teff [1]

( Kelvin)

Mass estimate

( MJ)

distance [1]

( light years)

Year of discovery
Jupiter Y-class analog [2] 125 1 solar system known since ancient times
WISE J0855−0714 Y4 (extrapolated) 250 ±50 3−10 [3] 7.43 ±0.04 2014 [4]
WISE J1639−6847 Y0pec 412 ±88 5−14 [5] or 9−17 [6] 15.45 ±0.04 [7] 2012 [8]
WISE J0350−5658 Y1 388 ±88 3−8 [5] or 7−13 [6] 18.49 ±0.24 2012 [9]
WISEPA J1541−2250 Y1 395 ±88 8−20 [5] 19.54 ±0.23 2011 [10] [11]
WISE J2209+2711 Y0: 389 ±88 8−19 [5] or 5 [12] 20.17 ±0.25 2014 [13]
WISEPC J1405+5534 Y0.5 (pec?) 411 ±88 9−21 [5] 20.6 ±0.3 2011 [10] [11]
WISE J0825+2805 Y0.5 376 ±88 3−8 [5] or 5 [12] 21.4 ±0.4 2015 [14]
WISEPA J0410+1502 Y0 451 ±88 8−20 [5] 21.6 ±0.3 2011 [10] [11]
CWISE J1055+5443 [15] Y0 (pec) 500 ±150 4−6 22+3
−2 		2023
WISEPC J2056+1459 Y0 464 ±88 13−23 [6] or 5 [12] 23.2 ±0.3 2011 [10] [11]
WISEPA J1738+2732 Y0 450 ±88 5−14, [5] 3−9 [16] or 11−21 [6] 24.9 ±0.4 2011 [10] [11]
WISEA J2354+0240 Y1 388 ±88 8−14 [6] 25.0 ±0.6 2015 [14]
CWISEP J0402−2651 ≥Y1 (estimated) 367 ±79 28.0+6.0
−4.2 		2020 [17]
WISENF J1936+0408 Y0 (estimated) 460 ±79 28.6+1.0
−0.9 		2020 [17]
WISE J0713−2917 Y0 464 ±88 13−29 [5] 29.8 ±0.6 2012 [9]
WISEPC J1217+1626 B Y0 460 ±79 8−20 [5] 30.4 ±1.0 2012 [18]
WISEA J1930−2059 ≥Y1 (estimated) 367 ±79 30.7+1.5
−1.4 		2020 [19]
WISEA J1141−3326 Y0 460 ±79 3–8 [5] 31.4 ±0.9 2014 [20]
CWISEP J2256+4002 ≥Y1 (estimated) 367 ±79 32.0+4.0
−3.2 		2020 [17]
WISEPA J1828+2650 ≥Y2 406 ±88 3–8 [5] 32.5+0.7
−0.6 		2011 [10] [11]
WISE J0336−0143 A Y0: [21] 460 ±79 8.5–18 [22] 32.7 ±0.7 2012 [9]
WISE J0336−0143 B [22] Y (estimated) 325 ±79 5–11.5 32.7 ±0.7 2023
WISE J0647−6232 Y1 393 ±88 5–13 [5] 32.8 ±0.6 2013 [23]
WISEU J0503−5648 ≥Y1 (estimated) 367 ±79 33.2+1.4
−1.3 		2020 [19]
CWISEP J1446−2317 ≥Y1 (estimated) 367 ±79 34+6
−4 		2020 [17]
WISE J2220−3628 Y0 452 ±88 8–20 [5] 34.2+0.8
−0.7 		2012 [9]
CWISE J0925−4720 Y0 (estimated) 460 ±79 ~35.0 2021 [24]
CWISER J0216+4230 Y0 (estimated) 460 ±79 ~35.2 2023 [1]
WISEA J0830+2837 ≥Y1 (estimated) 367 ±79 4−13 [25] 36+6
−5 		2020 [25]
CWISEP J0238−1332 ≥Y1 (estimated) 367 ±79 38+13
−8 		2020 [17]
WISE J1206+8401 Y0 454 ±88 6−14 [5] or 12−22 [6] 38.5+1.0
−0.9 		2015 [14]
CWISE J2351−7000 Y0 (estimated) 460 ±79 ~42.7 2020 [19]
CWISEP J1047+5457 Y0 (estimated) 460 ±79 43+9
−6 		2020 [17]
WISE J0734−7157 Y0 462 ±88 9−20 [5] 43.8 ±1.0 2012 [9]
WISE J0359−5401 Y0 436 ±88 12−22 [6] or 13 [12] 44.3 ±1.2 2012 [9]
WISE J0304−2705 Y0 pec 465 ±88 44.6+1.6
−1.5 		2014 [26]
CWISEP J2230+2549 ≥Y1 (estimated) 367 ±79 46+13
−8 		2020 [17]
CWISEP J2011−4812 Y0 (estimated) 460 ±79 46 ±2 2020 [17]
CWISE J1811+6658 early-Y (estimated) 412 ±79 47+5
−4 		2023 [1]
CWISEP J1935−1546 ≥Y1 (estimated) 367 ±79 47+3
−2 		2019 [27]
WISE J0535−7500 ≥Y1: 410 ±88 8−20 [5] or 12+18 [12] 47.5+1.4
−1.3 		2012 [9]
CWISEP J0321+6932 Y0.5 (estimated) 412 ±79 48 ±3 2020 [17]
WISEA J2243−1458 Y0 (estimated) 460 ±79 ~47.8 2020 [19]
CWISEP J0938+0634 Y0 (estimated) 460 ±79 48+12
−8 		2020 [17]
CWISEP J0940+5233 ≥Y1 (estimated) 367 ±79 49+11
−8 		2020 [17]
CWISEP J0634+5049 Y0 (estimated) 460 ±79 53+4
−3 		2020 [17]
WISEA J1534−1043 esdT/Y (estimated) 686 ±79 53 ±4 2020 [17]
WISEA J1257+7153 ≥Y1 (estimated) 367 ±79 ~54.2 2020 [19]
WISEA J0302−5817 Y0: 460 ±79 55 ±3 2018 [28]
CWISE J1531−3306 Y0 (estimated) 460 ±79 ~55.4 2021 [24]
CWISEP J2356−4814 Y0.5 (estimated) 412 ±79 ~56.6 2020 [17]
Ross 19 B Y (estimated) 460 ±79 15−40 [29] 56.89 ±0.04 2021 [29]
L 97-3 B Y1 (estimated) 377 ±88 7−9 [5] 62.73 ±0.02 2011 [30]
WISE J0146+4234 B Y0 460 ±79 8−20 [5] 63 ±2 2015 [31]
CWISE J2227+2604 Y0 (estimated) 460 ±79 ~65.2 2023 [1]
CWISEP J0859+5349 Y0 (estimated) 460 ±79 70+13
−14 		2020 [17]
CFBDSIR 1458+10 B [32] Y0 (estimated) 370 ± 40 6-15 75.34 ±7.83 2011

References

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  22. ^ a b 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.
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  32. ^ Liu, Michael C.; Delorme, Philippe; Dupuy, Trent J.; Bowler, Brendan P.; Albert, Loic; Artigau, Etienne; Reylé, Celine; Forveille, Thierry; Delfosse, Xavier (2011-10-01). "CFBDSIR J1458+1013B: A Very Cold (>T10) Brown Dwarf in a Binary System". The Astrophysical Journal. 740 (2): 108. arXiv: 1103.0014. Bibcode: 2011ApJ...740..108L. doi: 10.1088/0004-637X/740/2/108. ISSN  0004-637X.
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