Imaginary Picture of Kepler-397 c

Display orbital revolution of Kepler-397 c around the hoststar Kepler-397
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Exoplanet Name : Kepler-397 c
Alternate Name : "2MASS J19433458+4222496 c, K02681.01, KIC 6878240 c, KOI-2681 c, KOI-2681.01, WISE J194334.59+422249.5 c"
Status : Confirmed
Radius (Rjup / Re): 0.5510 (Rjup) 6.1762 (Rearth)
Mass (Mjup / Me): 0.1640 (Mjup) 52.1346 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.4800 (AU) 0.4800 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.3710
Orbital Period(Observed/Estimated) 135.50 (Days Obs.) 110.38 (Days Est.)
Surface Gravity (G Earth) 1.3668
Star Radiation at Atmospheric Boundary: 2419.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 313.0 (K)
Blackbody T 0.3(K) 294.0 (K)
Blackbody T 0.7(K) 237.8 (K)
Tidally Locked Blackbody T 0.1(K) 372.2 (K)
Tidally Locked Blackbody T 0.3(K) 349.6 (K)
Size Class: sub-Jupiter-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-397
Alternate Name : "2MASS J19433458+4222496, KIC 6878240, KOI-2681, WISE J194334.59+422249.5"
Star Distance(LY) : 2640.2
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 1.2 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5307 (K)
Spectral type : K0
UV portion[%]: 5.8
Visible portion[%]: 41.5
IR portion[%]: 52.6
Metalicity : -0.0
Absolute Magnitude: 5.0
Apparent Magnitude: 14.6
Right Ascension(RA) 295.8941
Declination (DEC) 42.3805
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-397+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-397%20c/
Kepler-397 c
Kepler-397 c

  • Kepler-397 c is an exoplanet orbiting the star Kepler-397, located about 2640.2 light-years (809.5 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kepler-397 has apparent magnitude of 14.6, with absolute magnitude of 5.0.
  • It is 1.2 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5307 with its spectral types of K0
  • In this planetary system, the extrasolar planet Kepler-397 c orbits around the star Kepler-397 every 135.5 days with its orbital distance of 0.48 AU ( 71806977.9 km)
  • (Projected orbit of Kepler-397 c around its host star Kepler-397)


  • The Star Kepler-397 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.462 AU ( 69095882.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.638 AU ( 95508566.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.973 AU ( 145533919.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.432 AU ( 214159537.4 km)
  • Radiation at Planetary Boundary of Kepler-397 c : 2419.42 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-397)



  • Kopparapu Recent Venus for Star Kepler-397 distance : 0.492 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-397 distance : 0.623 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-397 distance : 0.602 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-397 distance : 0.660 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-397 distance : 1.116 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-397 distance : 1.177 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-397)



  • Original Kopparapu Recent Venus for Star Kepler-397 distance : 0.489 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-397 distance : 0.641 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-397 distance : 0.646 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-397 distance : 1.135 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-397 distance : 1.180 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-397)



    (Position in Stellar Map of star Kepler-397 and its Exoplanet Kepler-397 c)



    (Zoomed position in Stellar Map of star Kepler-397 and its Exoplanet Kepler-397 c (zoom level 3))

    (Synthetic Spectrum of star Kepler-397*)
    *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