Wikipedia

List of coolest exoplanets

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.

Discovered in 2006, OGLE-2005-BLG-390Lb is the coldest known exoplanet, and was nicknamed "Hoth" by NASA in reference to the planet from the Star Wars franchise.[1]

List

edit
This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources.

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
 
 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]
 
 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]
 
 Neptune (For reference) -200 °C 17.15 M🜨 [7][8]
 
 Uranus (For reference) -195 °C 14.54 M🜨 [7][9]
TOI-969 c -176.6+6.8
−5.8 °C 		[10]
MOA-2007-BLG-400Lb -173 or -239 °C 0.5–1.3 MJ [11]
WASP-132d -166+11
−18 °C 		5.16±0.52 MJ [12]
 
 HIP 11915 b -155 °C 0.99 MJ A Jupiter analog. [b]
GJ 414 A c -148.3±13.5 °C 53.83 M🜨 [13]
HD 191939 f < -148 °C 2.1 MJ [14]
 
 Saturn (For reference) -140 °C 95 M🜨 [7][15]
Kepler-167 e -138.6±5 °C 1.01 MJ [16]
HD 115954 b -128.1+8.1
−13 °C 		8.29 MJ [17]
HD 118203 c -127±3 °C 11.1+1.3
−1.0 		[18]
 
 Gliese 777 b -123+26
−27 °C 		1.8 MJ [19]
GJ 1289 b -123 °C >6.27±1.25 M🜨 [20]
 
 Epsilon Eridani b (AEgir) -123 °C 0.63 MJ [21][22]
HD 164922 b -114 °C 0.365 MJ [23][24]
Teegarden's Star d -114 °C >0.82 M🜨 One of the nearest exoplanets. [25]
 
 Jupiter (For reference) -110 °C 317.8 M🜨 (1 MJ) [7][26]
 
 WD 1856+534 b -110+14
−18 °C 		<13.8 MJ [27]
 
 PSR B1257+12 d (Phobetor) -104 °C 3.9 M🜨 One of the first exoplanets discovered. [28]
 
 HR 5183 b -102+5.2
−5.1 °C 		3.23 MJ A highly-eccentric orbit planet. [29]
 
 TRAPPIST-1h -101.5 °C 0.326 M🜨 [30]
TOI-4010 e -99+8
−6 °C 		2.18 MJ [31]
HATS-59 c -97.1±6.4 °C 12.7 MJ [32]
HD 86226 b -97±4 °C 0.45 MJ [33]
GJ 1002 c -91.3±5.2 °C[c] 1.36 M🜨 Orbits within its star's habitable zone. [34]
EPIC 248847494 b -90+25
−18 °C 		<13 MJ [35]
Kepler-421b -88.2+8.6
−4.8 °C 		The transiting exoplanet with the longest orbital period. (704 days)[36] [37]
HD 192310 c -88 °C 24 M🜨 [38]
 
 Kepler-16b -85 °C 0.333 MJ A circumbinary planet. [39]
 
 Kepler-186f -85 °C[d] 1.44 M🜨 Potentially habitable [40][41]
TOI-4600 c -82±6 °C <9.27 MJ [42]
 
 PSR B1257+12 c (Poltergeist) -80 °C 4.3 M🜨 One of the first exoplanets discovered. [43]
 
 Gliese 876 b -79 °C 2.66 MJ [44][45]
 
 TRAPPIST-1g -75.8 °C[e] 1.321 M🜨 Potentially habitable [30][40][46]

Unconfirmed planets

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These exoplanets have not been confirmed.

Image

(Or artistic representation)

Name Temperature Mass[f] Notes References
K01174.01 -248 °C (25 K) Has a size of 0.267 RJ [47]
 
 Proxima Centauri c -234.2 °C (38.8 K) 7 M🜨 [48][49]

Notes and references

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  1. ^ "Meet 8 'Star Wars' Planets in Our Own Galaxy". exoplanets.nasa.gov. May 1, 2023. Retrieved December 11, 2023.
  2. ^ "Nitrogen - Melting Point - Boiling Point | nuclear-power.com". Nuclear Power. 2021-11-26. Retrieved 2023-12-11.
  3. ^ "Characteristics of the Solid, Liquid, and Gaseous States". www.chem.uiuc.edu. Retrieved 2023-12-11.
  4. ^ Beaulieu, J. -P.; Bennett, D. P.; Fouqué, P.; Williams, A.; Dominik, M.; Jørgensen, U. G.; Kubas, D.; Cassan, A.; Coutures, C.; Greenhill, J.; Hill, K.; Menzies, J.; Sackett, P. D.; Albrow, M.; Brillant, S. (2006-01-01). "Discovery of a cool planet of 5.5 Earth masses through gravitational microlensing". Nature. 439 (7075): 437–440. arXiv:astro-ph/0601563. Bibcode:2006Natur.439..437B. doi:10.1038/nature04441. ISSN 0028-0836. PMID 16437108. S2CID 4414076.
  5. ^ 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.
  6. ^ "PSR B1620-26b (Cold jovian)". Retrieved December 11, 2023.
  7. ^ a b c d "Solar System Temperatures - NASA Science". science.nasa.gov. Retrieved 2023-12-11.
  8. ^ "Neptune Fact Sheet". nssdc.gsfc.nasa.gov. Retrieved 2023-12-11.
  9. ^ "Uranus Fact Sheet". nssdc.gsfc.nasa.gov. Retrieved 2023-12-11.
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  1. ^ The melting points of elemental Nitrogen and Oxygen at 1 bar pressure are -210°C and -218°C, respectively.[2][3]
  2. ^ 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.
  3. ^ This is the surface temperature if GJ 1002 c has no atmosphere.
  4. ^ This is the surface temperature if Kepler-186f has no atmosphere.
  5. ^ This is the surface temperature if TRAPPIST-1g has no atmosphere.
  6. ^ M⊕: Earth mass MJ: Jupiter mass
  1. ^ The age is the same as the globular cluster where PSR B1620-26b is located (Messier 4), as all the stars in the cluster formed at the same time, and the planets form together with their host stars.
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