Imaginary Picture of K2-12 b
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Exoplanet Name : K2-12 b
Alternate Name : EPIC 201613023 b
Radius (Rjup / Re): 0.2080 (Rjup) 2.3315 (Rearth)
Mass (Mjup / Me): 0.0182 (Mjup) 5.7971 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0802 (AU) 0.0802 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0227
Orbital Period(Observed/Estimated) 8.28 (Days Obs.) 8.25 (Days Est.)
Star Radiation at Atmospheric Boundary: 220095.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 966.7 (K)
Blackbody T 0.3(K) 907.8 (K)
Blackbody T 0.7(K) 734.5 (K)
Tidally Locked Blackbody T 0.1(K) 1149.6 (K)
Tidally Locked Blackbody T 0.3(K) 1079.6 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-12
Alternate Name : EPIC 201613023
Star Distance(LY) : 958.9
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5800 (K)
Spectral type : G2
Metalicity : 0.0
Absolute Magnitude: 14.7
Apparent Magnitude: 22.0
Right Ascension(RA) 173.1920
Declination (DEC) 2.2449
Hubble Space Telescope Guide Star Catalog (GSC) ID 0
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK
Open Exoplanet Database Link
K2-12 b
K2-12 b

  • K2-12 b is an exoplanet orbiting the star K2-12, located about 958.9 light-years (294.0 pc) away from Solar System. Its discovery was publicly announced on 2015.
  • The host star K2-12 has apparent magnitude of 22.0, with absolute magnitude of 14.7.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5800 with its spectral types of G2
  • In this planetary system, the extrasolar planet K2-12 b orbits around the star K2-12 every 8.3 days with its orbital distance of 0.08 AU ( 11997749.2 km)
  • (Projected orbit of K2-12 b around its host star K2-12)


  • The Star K2-12 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.736 AU ( 110112208.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.017 AU ( 152203847.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.550 AU ( 231924981.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.281 AU ( 341287770.4 km)
  • Radiation at Planetary Boundary of K2-12 b : 220095.31 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-12)



  • Kopparapu Recent Venus for Star K2-12 distance : 0.762 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-12 distance : 0.965 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-12 distance : 0.932 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-12 distance : 1.022 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-12 distance : 1.703 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-12 distance : 1.796 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-12)



  • Original Kopparapu Recent Venus for Star K2-12 distance : 0.763 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-12 distance : 0.991 AU
  • Original Kopparapu Moist Greenhouse for Star K2-12 distance : 1.010 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-12 distance : 1.733 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-12 distance : 1.802 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-12)



    (Position in Stellar Map of star K2-12 and its Exoplanet K2-12 b)



    (Zoomed position in Stellar Map of star K2-12 and its Exoplanet K2-12 b (zoom level 3))