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Last Update: December 15, 2014

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These are artistic representations of all the planets around other stars (exoplanets) with any potential to support surface life as we know itMost of them are larger than Earth and we are not certain about their composition and habitability. They are ranked here from closest to farthest from Earth. This selection of objects of interest is subject to change as new interpretations or astronomical observations are made. Earth, Mars, Jupiter, and Neptune are shown for scale on the right.


Current Number of Potentially Habitable Exoplanets
Subterran
(Mars-size)

Terran
(Earth-size)
Superterran
(Super-Earth)
Total
0 7 15 22

subterran0.1 — 0.5 ME or 0.4 — 0.8 RE, terran0.5 — 5 ME or 0.8 — 1.5 RE, superterran5 — 10 ME or 1.5 — 2.5 RE. ME = Earth masses, and RE = Earth radii.
Name Type M (ME) R (RE) S (So) Teq (K) P (days) d (ly) ESI
01. GJ 667C c M-Warm Terran 3.8 1.1 - 1.5 - 2.0 0.88 247 28.1 24 0.84
02. Kepler-62 e K-Warm Superterran 18.7 - 4.5 - 1.9 1.6 1.10 261 122.4 1200 0.83
03. GJ 832 c M-Warm Superterran 5.4 1.2 - 1.7 - 2.2 1.00 253 35.7 16 0.81
04. Kepler-283 c K-Warm Superterran 35.3 - 7.0 - 2.8 1.8 0.90 248 92.7 1741 0.79
05. tau Cet e* G-Warm Terran 4.3 1.1 - 1.6 - 2.0 1.51 282 168.1 12 0.78
06. Kepler-296 f K-Warm Superterran 32.8 - 6.7 - 2.7 1.8 1.33 273 63.3 1692 0.78
07. GJ 180 c* M-Warm Superterran 6.4 1.3 - 1.8 - 2.3 0.79 239 24.3 38 0.77
08. GJ 667C f* M-Warm Terran 2.7 1.0 - 1.4 - 1.8 0.56 221 39.0 24 0.77
09. GJ 180 b* M-Warm Superterran 8.3 1.3 - 1.9 - 2.4 1.23 268 17.4 38 0.75
10. GJ 163 c M-Warm Superterran 7.3 1.3 - 1.8 - 2.4 1.40 277 25.6 49 0.75
11. HD 40307 g K-Warm Superterran 7.1 1.3 - 1.8 - 2.3 0.68 227 197.8 42 0.74
12. Kepler-61 b K-Warm Superterran N/A - 13.8 - 5.2 2.2 1.27 267 59.9 1063 0.73
13. Kepler-22 b G-Warm Superterran N/A - 20.4 - 7.2 2.4 1.11 261 289.9 619 0.71
14. GJ 422 b* M-Warm Superterran 9.9 1.4 - 2.0 - 2.6 0.68 231 26.2 41 0.71
15. GJ 3293 c* M-Warm Superterran 8.6 1.4 - 1.9 - 2.5 0.60 223 48.1 59 0.70
16. Kepler-298 d K-Warm Superterran N/A - 26.8 - 9.1 2.5 1.29 271 77.5 1545 0.68
17. Kapteyn b M-Warm Terran 4.8 1.2 - 1.6 - 2.1 0.43 205 48.6 13 0.67
18. Kepler-62 f K-Warm Terran 10.2 - 2.8 - 1.2 1.4 0.39 201 267.3 1200 0.67
19. Kepler-186 f K-Warm Terran 3.9 - 1.2 - 0.5 1.1 0.32 192 129.9 492 0.64
20. Kepler-174 d K-Warm Superterran N/A - 14.8 - 5.5 2.2 0.43 206 247.4 1174 0.61
21. GJ 667C e* M-Warm Terran 2.7 1.0 - 1.4 - 1.8 0.30 189 62.2 24 0.60
22. GJ 682 c* M-Warm Superterran 8.7 1.4 - 1.9 - 2.5 0.37 198 57.3 17 0.59

* planet canditate/unconfirmed
















Table Legend


  • Name - name of the planet.
  • Type - PHL's planet classification that includes host star spectral type (F, G, K, M), habitable zone (hot, warm, cold) and size (miniterran, subterran, terran, superterran, jovian, neptunian) (e.g. Earth = G-Warm Terran).
  • M - Minimum mass of the planet in Earth masses (Earth = 1.0 ME). Estimated for a pure iron, rocky, and water composition, respectively, when not available. 
  • R - Radius of planet in Earth radii (Earth = 1.0 RE). Estimated for a pure iron, rocky, and water composition, respectively, when not available.
  • S - Average stellar flux of the planet in solar fluxes (Earth = 1.0 So).
  • Teq - Equilibrium temperature in kelvins (K) assuming a 0.3 bond albedo (Earth = 255 K).
  • P - orbital period in days (Earth = 365 days).
  • d - distance from Earth in light years (ly).
  • ESI - Earth Similarity Index, a measure of similarity to Earth based on both stellar flux and size (results are sorted by this number).
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