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.
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 |
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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.
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 |
{{
cite journal}}
: CS1 maint: numeric names: authors list (
link)