Imaginary Picture of Kepler-331 c

Display orbital revolution of Kepler-331 c around the hoststar Kepler-331
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Exoplanet Name : Kepler-331 c
Alternate Name : "2MASS J19272023+3918264 c, K01895.02, KIC 4263293 c, KOI-1895 c, KOI-1895.02, WISE J192720.24+391826.4 c"
Status : Confirmed
Radius (Rjup / Re): 0.1640 (Rjup) 1.8383 (Rearth)
Mass (Mjup / Me): 0.0146 (Mjup) 4.6475 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1050 (AU) 0.1050 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0473
Orbital Period(Observed/Estimated) 17.28 (Days Obs.) 17.40 (Days Est.)
Surface Gravity (G Earth) 1.3753
Star Radiation at Atmospheric Boundary: 19461.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 527.2 (K)
Blackbody T 0.3(K) 495.1 (K)
Blackbody T 0.7(K) 400.6 (K)
Tidally Locked Blackbody T 0.1(K) 626.9 (K)
Tidally Locked Blackbody T 0.3(K) 588.7 (K)
Size Class: super-Earth-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 : Kepler-331
Alternate Name : "2MASS J19272023+3918264, KIC 4263293, KOI-1895, WISE J192720.24+391826.4"
Star Distance(LY) : 1892.5
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.5 (Msun Measured) 0.5 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4347 (K)
Spectral type : K5
UV portion[%]: 1.0
Visible portion[%]: 28.4
IR portion[%]: 70.6
Metalicity : -0.8
Absolute Magnitude: 5.3
Apparent Magnitude: 14.1
Right Ascension(RA) 291.8343
Declination (DEC) 39.3074
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-331+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-331%20c/
Kepler-331 c
Kepler-331 c

  • Kepler-331 c is an exoplanet orbiting the star Kepler-331, located about 1892.5 light-years (580.2 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kepler-331 has apparent magnitude of 14.1, with absolute magnitude of 5.3.
  • It is 0.5 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4347 with its spectral types of K5
  • In this planetary system, the extrasolar planet Kepler-331 c orbits around the star Kepler-331 every 17.3 days with its orbital distance of 0.10 AU ( 15707776.4 km)
  • (Projected orbit of Kepler-331 c around its host star Kepler-331)


  • The Star Kepler-331 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.287 AU ( 42868218.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.396 AU ( 59255080.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.604 AU ( 90291629.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.888 AU ( 132868088.1 km)
  • Radiation at Planetary Boundary of Kepler-331 c : 19461.70 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-331)



  • Kopparapu Recent Venus for Star Kepler-331 distance : 0.318 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-331 distance : 0.403 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-331 distance : 0.389 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-331 distance : 0.427 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-331 distance : 0.751 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-331 distance : 0.793 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-331)



  • Original Kopparapu Recent Venus for Star Kepler-331 distance : 0.314 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-331 distance : 0.416 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-331 distance : 0.415 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-331 distance : 0.763 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-331 distance : 0.794 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-331)



    (Position in Stellar Map of star Kepler-331 and its Exoplanet Kepler-331 c)



    (Zoomed position in Stellar Map of star Kepler-331 and its Exoplanet Kepler-331 c (zoom level 3))

    (Synthetic Spectrum of star Kepler-331*)
    *Yamashiki YA et al. 2019 ApJ 881 114
    MUSCLES Paper I - France et al. 2016 ApJ 820 89
    MUSCLES Paper II- Youngblood et al. 2016 ApJ 824 101
    MUSCLES Paper III- Loyd et al. 2016 ApJ 824 102