This is a list of the coolest exoplanets known, specifically those with temperatures lower than −75 °C (198 K). Planets from the Solar System were also included for comparison purposes.
![](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a2/ESO_OGLE-2005-BLG-390Lb.jpg/300px-ESO_OGLE-2005-BLG-390Lb.jpg)
List
[edit]All temperatures here are equilibrium temperatures. The coldest planet with a measured temperature is Epsilon Indi b, but too hot to be in the list.
Image (or artistic representation) |
Name | Temperature | Mass
(M⊕ or MJ) |
Notes | References |
---|---|---|---|---|---|
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OGLE-2005-BLG-390Lb | -223 °C (50 K) | 5.5 M🜨 | The coldest known exoplanet, with a temperature lower than the melting points of oxygen and nitrogen. [a] | [4] |
OGLE-2005-BLG-071L b | -218 °C | 3.8 MJ | [5] | ||
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PSR B1620-26 b | -201.2 °C | 2.5 MJ | One of the oldest exoplanets known, with an age of 12.7 billion years.[note 1] | [6] |
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Neptune (For reference) | -200 °C | 17.15 M🜨 | [7][8] | |
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Uranus (For reference) | -195 °C | 14.54 M🜨 | [7][9] | |
TOI-969 c | -176.6+6.8 −5.8 °C |
[10] | |||
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HIP 11915 b | -155 °C | 0.99 MJ | A Jupiter analog. | [b] |
GJ 414 A c | -148.3±13.5 °C | 53.83 M🜨 | [11] | ||
HD 191939 f | < -148 °C | 2.1 MJ | [12] | ||
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Saturn (For reference) | -140 °C | 95 M🜨 | [7][13] | |
Kepler-167 e | -138.6±5 °C | 1.01 MJ | [14] | ||
HD 115954 b | -128.1+8.1 −13 °C |
8.29 MJ | [15] | ||
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Gliese 777 b | -123+26 −27 °C |
1.8 MJ | [16] | |
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Epsilon Eridani b (AEgir) | -123 °C | 0.63 MJ | [17][18] | |
HD 164922 b | -114 °C | 0.365 MJ | [19][20] | ||
Teegarden's Star d | -114 °C | >0.82 M🜨 | One of the nearest exoplanets. | [21] | |
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Jupiter (For reference) | -110 °C | 317.8 M🜨 (1 MJ) | [7][22] | |
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WD 1856+534 b | -110+14 −18 °C |
<13.8 MJ | [23] | |
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PSR B1257+12 d (Phobetor) | -104 °C | 3.9 M🜨 | One of the first exoplanets discovered. | [24] |
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HR 5183 b | -102+5.2 −5.1 °C |
3.23 MJ | A highly-eccentric orbit planet. | [25] |
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TRAPPIST-1h | -101.5 °C | 0.326 M🜨 | [26] | |
TOI-4010 e | -99+8 −6 °C |
2.18 MJ | [27] | ||
HATS-59 c | -97.1±6.4 °C | 12.7 MJ | [28] | ||
HD 86226 b | -97±4 °C | 0.45 MJ | [29] | ||
GJ 1002 c | -91.3±5.2 °C[c] | 1.36 M🜨 | Orbits within its star's habitable zone. | [30] | |
EPIC 248847494 b | -90+25 −18 °C |
<13 MJ | [31] | ||
Kepler-421b | -88.2+8.6 −4.8 °C |
The transiting exoplanet with the longest orbital period. (704 days)[32] | [33] | ||
HD 192310 c | -88 °C | 24 M🜨 | [34] | ||
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Kepler-16b | -85 °C | 0.333 MJ | A circumbinary planet. | [35] |
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Kepler-186f | -85 °C[d] | 1.44 M🜨 | Potentially habitable | [36][37] |
TOI-4600 c | -82±6 °C | <9.27 MJ | [38] | ||
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PSR B1257+12 c (Poltergeist) | -80 °C | 4.3 M🜨 | One of the first exoplanets discovered. | [39] |
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Gliese 876 b | -79 °C | 2.66 MJ | [40][41] | |
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TRAPPIST-1g | -75.8 °C[e] | 1.321 M🜨 | Potentially habitable | [26][36][42] |
Unconfirmed planets
[edit]These exoplanets have not been confirmed.
Image
(Or artistic representation) |
Name | Temperature | Mass[f] | Notes | References |
---|---|---|---|---|---|
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Proxima Centauri c | -234.2 °C (38.8 K) | 7 M🜨 | [43][44] |
Notes and references
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- ^ Dong, Subo; Gould, Andrew; Udalski, Andrzej; Anderson, Jay; Christie, G. W.; Gaudi, B. S.; OGLE Collaboration; Jaroszyński, M.; Kubiak, M.; Szymański, M. K.; Pietrzyński, G.; Soszyński, I.; Szewczyk, O.; Ulaczyk, K.; Wyrzykowski, Ł. (2009-04-01). "OGLE-2005-BLG-071Lb, the Most Massive M Dwarf Planetary Companion?". The Astrophysical Journal. 695 (2): 970–987. arXiv:0804.1354. Bibcode:2009ApJ...695..970D. doi:10.1088/0004-637X/695/2/970. ISSN 0004-637X. S2CID 14408891.
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- ^ The melting points of elemental Nitrogen and Oxygen at 1 bar pressure are -210°C and -218°C, respectively.[2][3]
- ^ This was obtained using the CalcTool luminosity converter. Using the apparent magnitude of HIP 11915 and its distance from Earth (using the uncertainty parameter of ±10 light years), this yields a range of 1.03–1.27 L☉. When used in the default 190 light-year distance (with margin of error) is 1.07+0.11
−0.09 L☉. When run into simulations using the orbital distance of HIP 11915 and its planet, yields a result of 118 K. - ^ This is the surface temperature if GJ 1002 c has no atmosphere.
- ^ This is the surface temperature if Kepler-186f has no atmosphere.
- ^ This is the surface temperature if TRAPPIST-1g has no atmosphere.
- ^ M⊕: Earth mass MJ: Jupiter mass