Imaginary Picture of Kepler-309 c
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Exoplanet Name : Kepler-309 c
Alternate Name :
Radius (Rjup / Re): 0.2240 (Rjup) 2.5108 (Rearth)
Mass (Mjup / Me): 0.0195 (Mjup) 6.2107 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.4010 (AU) 0.4010 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.2884
Orbital Period(Observed/Estimated) 105.36 (Days Obs.) 89.56 (Days Est.)
Star Radiation at Atmospheric Boundary: 1950.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 296.6 (K)
Blackbody T 0.3(K) 278.5 (K)
Blackbody T 0.7(K) 225.4 (K)
Tidally Locked Blackbody T 0.1(K) 352.7 (K)
Tidally Locked Blackbody T 0.3(K) 331.3 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Not habitable
Star Name : Kepler-309
Alternate Name :
Star Distance(LY) : 0.0
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4713 (K)
Spectral type : K3
Metalicity : 0.4
Absolute Magnitude: 25.0
Apparent Magnitude: 13.5
Right Ascension(RA) 297.5099
Declination (DEC) 46.9613
Hubble Space Telescope Guide Star Catalog (GSC) ID 0
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK 0
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-309%20c/
Kepler-309 c
Kepler-309 c

  • Kepler-309 c is an exoplanet orbiting the star Kepler-309. Its discovery was publicly announced on 2014.
  • The host star Kepler-309 has apparent magnitude of 13.5, with absolute magnitude of 25.0.
  • It is 1.1 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4713 with its spectral types of K3
  • In this planetary system, the extrasolar planet Kepler-309 c orbits around the star Kepler-309 every 105.4 days with its orbital distance of 0.40 AU ( 59988746.2 km)
  • (Projected orbit of Kepler-309 c around its host star Kepler-309)


  • The Star Kepler-309 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.346 AU ( 51830510.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.479 AU ( 71643310.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.730 AU ( 109168551.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.074 AU ( 160646305.1 km)
  • Radiation at Planetary Boundary of Kepler-309 c : 1950.61 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-309)



  • Kopparapu Recent Venus for Star Kepler-309 distance : 0.380 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-309 distance : 0.481 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-309 distance : 0.464 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-309 distance : 0.510 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-309 distance : 0.882 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-309 distance : 0.930 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-309)



  • Original Kopparapu Recent Venus for Star Kepler-309 distance : 0.375 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-309 distance : 0.496 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-309 distance : 0.496 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-309 distance : 0.896 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-309 distance : 0.932 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-309)



    (Position in Stellar Map of star Kepler-309 and its Exoplanet Kepler-309 c)



    (Zoomed position in Stellar Map of star Kepler-309 and its Exoplanet Kepler-309 c (zoom level 3))