HEC: Data of Potential Habitable Worlds

Last Update: December 15, 2014

The database of potentially habitable worlds of the Habitable Exoplanets Catalog (HEC) identifies objects of interest for follow-up observations and for statistical studies, including both confirmed and unconfirmed exoplanets. The database is updated with corrections and additions as new results are available. Check the methods section for explanations of the habitability metrics and classifications used here. HEC corrects or model many of the planetary properties combining different databases, so the numbers might not match those of a particular exoplanets database. Check for example the Extrasolar Planets Encyclopedia or the NASA Exoplanet Archive for observed values. The PHL's Exoplanets Catalog also has many more details for all exoplanets.

Main Database of the Habitable Exoplanets Catalog


These are confirmed and unconfirmed potentially habitable exoplanets discovered by ground or space observatories. Mass or radius for an iron, rocky, and water composition are given when not available for comparison purposes (Seager et al., 2007). Equilibrium temperatures are calculated assuming a 0.3 bond albedo. All planets are sorted by an Earth Similarity Index (ESI) based on how similar they are to Earth's stellar flux and size (either measured from mass or radius).

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














Potentially Habitable Exoplanets from NASA Kepler Candidates


These are mostly unconfirmed exoplanets discovered by the NASA Kepler mission (Kepler Candidates from the NASA Exoplanet Archive). Those already confirmed are listed by their Kepler name in the table above. This is a working list and data might be revised constantly or be different from other databasesMass for a pure iron, rocky, and water composition are given for comparison purposes (Seager et al., 2007).

Name Type M (ME) R (RE) S (So) Teq (K) P (days) d (ly) ESI
001. KOI-4878.01* F-Warm Terran 3.0 - 1.0 - 0.4 1.0 1.05 258 449.0 1075 0.98
002. KOI-1422.05 K-Warm Terran 3.5 - 1.1 - 0.5 1.1 0.84 244 34.1 669 0.93
003. KOI-3456.02* F-Warm Terran 4.9 - 1.5 - 0.7 1.2 0.92 249 486.1 1460 0.93
004. KOI-2650.01 K-Warm Terran 6.1 - 1.8 - 0.8 1.2 1.15 264 35.0 840 0.91
005. KOI-3284.01* K-Warm Terran 2.4 - 0.8 - 0.4 1.0 1.31 273 35.2 473 0.90
006. KOI-5927.01* G-Warm Terran 6.3 - 1.9 - 0.8 1.3 0.86 245 436.4 1533 0.90
007. KOI-5737.01* G-Warm Terran 7.7 - 2.2 - 1.0 1.3 0.99 254 376.2 1833 0.90
008. KOI-5806.01* G-Warm Terran 6.3 - 1.9 - 0.8 1.3 1.29 271 313.8 970 0.88
009. KOI-5499.01* G-Warm Terran 5.1 - 1.6 - 0.7 1.2 1.43 279 122.6 1965 0.86
010. KOI-2194.03* F-Warm Terran 10.8 - 2.9 - 1.2 1.4 0.78 239 445.2 1914 0.85
011. KOI-2626.01* M-Warm Terran 4.0 - 1.3 - 0.6 1.1 0.65 229 38.1 623 0.84
012. KOI-3010.01* K-Warm Superterran 16.0 - 4.0 - 1.7 1.6 0.93 250 60.9 1080 0.84
013. KOI-4742.01* K-Warm Superterran 16.0 - 4.0 - 1.7 1.6 1.08 260 112.3 1292 0.84
014. KOI-6108.01* G-Warm Terran 3.4 - 1.1 - 0.5 1.1 0.61 225 485.9 755 0.83
015. KOI-5938.01* F-Warm Superterran 21.7 - 5.0 - 2.1 1.7 1.03 257 545.2 1597 0.82
016. KOI-463.01* M-Warm Superterran 16.5 - 4.1 - 1.7 1.6 1.27 270 18.5 288 0.82
017. KOI-4550.01* K-Warm Superterran 26.9 - 5.9 - 2.4 1.7 1.04 257 140.3 1848 0.81
018. KOI-5087.01* G-Warm Superterran 15.5 - 3.9 - 1.6 1.6 0.71 234 651.1 1260 0.81
019. KOI-701.03 K-Warm Superterran 26.9 - 5.9 - 2.4 1.7 1.18 265 122.4 802 0.80
020. KOI-5948.01* G-Warm Terran 5.8 - 1.7 - 0.8 1.2 0.58 222 398.5 1427 0.80
021. KOI-5176.01* G-Warm Terran 6.3 - 1.9 - 0.8 1.3 1.72 292 215.7 1304 0.80
022. KOI-4036.01* K-Warm Superterran 37.2 - 7.3 - 2.9 1.8 1.02 256 168.8 1135 0.79
023. KOI-5232.01* F-Warm Superterran 36.0 - 7.1 - 2.9 1.8 1.09 260 476.4 2240 0.79
024. KOI-438.02 K-Warm Superterran 29.6 - 6.3 - 2.5 1.8 1.28 271 52.7 585 0.79
025. KOI-5788.01* F-Warm Superterran 17.0 - 4.2 - 1.7 1.6 1.52 283 242.5 2871 0.78
026. KOI-5949.01* F-Warm Superterran 44.2 - 8.1 - 3.2 1.9 0.92 249 559.8 1873 0.78
027. KOI-5506.01* F-Warm Superterran 18.6 - 4.5 - 1.9 1.6 0.66 230 641.6 2638 0.78
028. KOI-5920.01* F-Warm Superterran 42.6 - 7.9 - 3.1 1.9 1.16 264 471.4 2342 0.78
029. KOI-6239.01* G-Warm Superterran 30.6 - 6.4 - 2.6 1.8 0.73 236 406.5 1743 0.78
030. KOI-5326.01* F-Warm Superterran 33.7 - 6.8 - 2.7 1.8 1.35 275 506.8 1482 0.77
031. KOI-5856.01* G-Warm Superterran 24.5 - 5.5 - 2.2 1.7 1.48 281 259.3 2543 0.77
032. KOI-5888.01* G-Warm Superterran 38.5 - 7.4 - 3.0 1.8 1.32 273 190.9 2875 0.77
033. KOI-812.03 K-Warm Superterran 55.0 - 9.1 - 3.6 1.9 1.16 265 46.2 1076 0.77
034. KOI-2529.02* K-Warm Superterran 47.4 - 8.4 - 3.3 1.9 1.28 271 64.0 1339 0.76
035. KOI-5623.01* F-Warm Superterran 70.1 - 10.3 - 4.0 2.0 0.91 249 583.8 3403 0.76
036. KOI-5068.01* F-Warm Superterran 16.5 - 4.1 - 1.7 1.6 1.69 290 385.3 1740 0.76
037. KOI-5541.01* G-Warm Superterran N/A - 11.2 - 4.3 2.0 0.93 250 339.6 2550 0.76
038. KOI-5959.01* G-Warm Superterran 27.8 - 6.0 - 2.4 1.7 1.55 284 251.5 2451 0.76
039. KOI-5904.01* G-Warm Subterran 0.7 - 0.2 - 0.1 0.7 0.55 219 322.5 449 0.75
040. KOI-5236.01* F-Warm Superterran 64.4 - 9.9 - 3.8 2.0 0.79 240 550.9 1605 0.75
041. KOI-3282.01* K-Warm Superterran 61.9 - 9.7 - 3.8 2.0 1.30 272 49.3 1163 0.75
042. KOI-172.02 G-Warm Superterran 27.8 - 6.0 - 2.4 1.7 1.60 286 242.5 1618 0.75
043. KOI-5819.01* G-Warm Terran 5.9 - 1.8 - 0.8 1.2 0.48 212 381.4 1459 0.74
044. KOI-5413.01* G-Warm Superterran 70.1 - 10.3 - 4.0 2.0 0.74 236 428.4 1882 0.74
045. KOI-4450.01* G-Warm Superterran 64.4 - 9.9 - 3.8 2.0 1.38 276 196.4 2553 0.74
046. KOI-4054.01* G-Warm Superterran 67.2 - 10.1 - 3.9 2.0 1.41 278 169.1 1770 0.74
047. KOI-5202.01* F-Warm Superterran 37.2 - 7.3 - 2.9 1.8 0.63 227 535.9 2865 0.74
048. KOI-1871.01* K-Warm Superterran N/A - 13.8 - 5.2 2.1 1.21 267 92.7 1169 0.73
049. KOI-87.01 G-Warm Superterran N/A - 14.4 - 5.4 2.2 1.21 267 289.9 647 0.73
050. KOI-4745.01* K-Warm Superterran N/A - 15.2 - 5.6 2.2 0.87 246 177.7 2564 0.73
051. KOI-2020.01* K-Warm Superterran N/A - 13.1 - 4.9 2.1 0.77 239 111.0 1296 0.73
052. KOI-5017.01* G-Warm Superterran 33.7 - 6.8 - 2.7 1.8 0.59 224 492.3 1470 0.73
053. KOI-250.04 K-Warm Superterran N/A - 12.8 - 4.8 2.1 1.32 273 46.8 953 0.73
054. KOI-5653.01* K-Warm Superterran N/A - 10.7 - 4.1 2.0 0.68 231 188.7 1895 0.73
055. KOI-5237.01* G-Warm Superterran 38.5 - 7.4 - 3.0 1.8 0.60 224 380.4 2761 0.72
056. KOI-854.01* K-Warm Superterran 59.4 - 9.5 - 3.7 2.0 0.65 228 56.1 858 0.72
057. KOI-1361.01 K-Warm Superterran N/A - 14.4 - 5.4 2.2 1.30 272 59.9 918 0.72
058. KOI-1876.01* K-Warm Superterran N/A - 18.1 - 6.5 2.3 0.96 252 82.5 1046 0.72
059. KOI-6151.01* G-Warm Terran 8.7 - 2.5 - 1.1 1.4 0.47 211 431.8 1731 0.72
060. KOI-5545.01* G-Warm Terran 3.5 - 1.1 - 0.5 1.1 0.43 206 541.0 1379 0.72
061. KOI-5592.01* F-Warm Superterran N/A - 18.5 - 6.7 2.3 0.81 241 482.5 3587 0.71
062. KOI-4986.01* G-Warm Terran 12.5 - 3.3 - 1.4 1.5 0.47 211 444.0 2112 0.71
063. KOI-5796.01* F-Warm Superterran N/A - 18.5 - 6.7 2.3 0.78 239 495.9 3110 0.71
064. KOI-5613.01* G-Warm Superterran N/A - 22.7 - 7.9 2.4 0.94 251 346.4 3972 0.71
065. KOI-4016.01* K-Warm Superterran N/A - 18.5 - 6.7 2.3 0.76 238 125.4 763 0.70
066. KOI-2834.01* K-Warm Superterran N/A - 23.6 - 8.2 2.4 0.94 251 136.2 2093 0.70
067. KOI-5810.01* G-Warm Superterran N/A - 16.8 - 6.1 2.2 1.41 278 425.6 2336 0.70
068. KOI-5835.01* F-Warm Superterran N/A - 24.0 - 8.3 2.4 0.91 249 475.0 3791 0.70
069. KOI-5290.01* G-Warm Superterran N/A - 11.6 - 4.4 2.1 0.61 225 435.5 3793 0.70
070. KOI-4583.01* G-Warm Superterran N/A - 11.4 - 4.4 2.0 0.61 225 330.9 3127 0.70
071. KOI-5869.01* K-Warm Superterran N/A - 23.2 - 8.1 2.4 1.21 267 114.4 2007 0.70
072. KOI-3401.02* G-Warm Superterran N/A - 15.2 - 5.6 2.2 1.52 283 326.7 2697 0.70
073. KOI-5657.01* F-Warm Superterran 70.1 - 10.3 - 4.0 2.0 1.74 293 284.7 2745 0.70
074. KOI-4988.01* G-Warm Superterran N/A - 21.5 - 7.6 2.4 0.72 235 484.2 2047 0.69
075. KOI-4333.01* F-Warm Superterran N/A - 14.7 - 5.5 2.2 1.61 287 309.3 2583 0.69
076. KOI-701.04 K-Warm Terran 10.4 - 2.9 - 1.2 1.4 0.41 204 267.3 802 0.68
077. KOI-5874.01* G-Warm Superterran N/A - 15.5 - 5.7 2.2 1.65 289 287.3 1770 0.68
078. KOI-5889.01* F-Warm Superterran N/A - 23.2 - 8.1 2.4 1.45 279 374.4 5030 0.68
079. KOI-4005.01* G-Warm Superterran N/A - 19.5 - 7.0 2.3 1.55 284 178.1 1915 0.68
080. KOI-5135.01* G-Warm Superterran 70.1 - 10.3 - 4.0 2.0 0.53 217 314.8 2577 0.68
081. KOI-3138.01* M-Warm Subterran 0.4 - 0.1 - 0.1 0.6 0.47 211 8.7 219 0.68
082. KOI-1422.04 K-Warm Terran 5.8 - 1.7 - 0.8 1.2 0.37 199 63.3 669 0.67
083. KOI-5556.01* G-Warm Superterran 41.2 - 7.7 - 3.1 1.9 0.46 210 632.0 1459 0.66
084. KOI-4087.01* K-Warm Terran 12.2 - 3.2 - 1.4 1.5 0.39 201 101.1 706 0.66
085. KOI-2418.01* K-Warm Terran 4.0 - 1.3 - 0.6 1.1 0.35 196 86.8 683 0.66
086. KOI-5798.01* G-Warm Superterran N/A - 10.9 - 4.2 2.0 0.48 212 318.3 2632 0.65
087. KOI-3946.01* F-Warm Superterran N/A - 20.7 - 7.3 2.4 1.87 298 308.5 1771 0.64
088. KOI-5196.01* F-Warm Superterran N/A - 22.7 - 7.9 2.4 1.84 297 392.5 1424 0.64
089. KOI-5924.01* G-Warm Superterran N/A - 26.4 - 9.0 2.5 0.54 218 291.3 2604 0.63
090. KOI-3028.02* G-Warm Superterran N/A - 12.8 - 4.8 2.1 0.45 208 458.2 3759 0.63
091. KOI-5398.01* G-Warm Superterran N/A - 12.6 - 4.8 2.1 0.43 206 551.2 2154 0.62
092. KOI-4902.01* K-Warm Superterran 31.6 - 6.5 - 2.6 1.8 0.35 196 409.4 2012 0.61
093. KOI-1596.02 K-Warm Superterran N/A - 12.3 - 4.7 2.1 0.40 203 105.4 759 0.61
094. KOI-5749.01* K-Warm Superterran N/A - 18.8 - 6.8 2.3 0.41 204 282.0 1883 0.59
095. KOI-4961.01* K-Warm Superterran N/A - 11.2 - 4.3 2.0 0.36 198 349.0 2048 0.59
096. KOI-5829.01* G-Warm Superterran 61.9 - 9.7 - 3.8 2.0 0.35 196 583.9 2412 0.59
097. KOI-4622.01* K-Warm Superterran 52.9 - 8.9 - 3.5 1.9 0.34 194 207.2 1158 0.58
098. KOI-2770.01* K-Warm Superterran N/A - 18.8 - 6.8 2.3 0.39 201 205.4 1511 0.58
099. KOI-571.05 K-Warm Terran 3.3 - 1.1 - 0.5 1.1 0.25 179 129.9 525 0.57
100. KOI-518.03 K-Warm Superterran N/A - 12.6 - 4.8 2.1 0.34 194 247.4 866 0.57
101. KOI-5570.01* G-Warm Superterran N/A - 17.8 - 6.4 2.3 0.35 196 574.7 2236 0.56
102. KOI-4356.01* K-Warm Superterran 49.2 - 8.6 - 3.4 1.9 0.29 187 174.5 1240 0.55
103. KOI-5649.01* G-Warm Superterran N/A - 19.2 - 6.9 2.3 0.29 187 426.9 1861 0.52

* planet canditate/unconfirmed














Table Legend


  • Name - name of the planet.
  • Type - planet classification from host star spectral type (F, G, K, M), habitable zone (hot, warm, cold) and size (miniterran, subterran, terran, superterran, jovian, neptunian) (Earth = G-Warm Terran).
  • M - Minimum mass of the planet in Earth masses (Earth = 1.0 ME). Estimated from mass-radius relationships in some cases.
  • R - Radius of planet in Earth radii (Earth = 1.0 RE). Estimated from mass-radius relationships in some cases.
  • S - Stellar flux of the planet in solar units (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 stellar flux and size (results are sorted by this number).