Imaginary Picture of Kepler-399 c

Display orbital revolution of Kepler-399 c around the hoststar Kepler-399
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Exoplanet Name : Kepler-399 c
Alternate Name : "2MASS J19580041+4040148 c, K02707.03, KIC 5480640 c, KOI-2707 c, KOI-2707.03, WISE J195800.41+404014.5 c"
Status : Confirmed
Radius (Rjup / Re): 0.1280 (Rjup) 1.4348 (Rearth)
Mass (Mjup / Me): 0.0114 (Mjup) 3.6156 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1550 (AU) 0.1550 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0730
Orbital Period(Observed/Estimated) 26.68 (Days Obs.) 23.44 (Days Est.)
Surface Gravity (G Earth) 1.7564
Star Radiation at Atmospheric Boundary: 60512.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 700.0 (K)
Blackbody T 0.3(K) 657.4 (K)
Blackbody T 0.7(K) 531.9 (K)
Tidally Locked Blackbody T 0.1(K) 832.5 (K)
Tidally Locked Blackbody T 0.3(K) 781.8 (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-399
Alternate Name : "2MASS J19580041+4040148, KIC 5480640, KOI-2707, WISE J195800.41+404014.5"
Star Distance(LY) : 2205.2
Stellar Radius(Rsun) : 1.2 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5467 (K)
Spectral type : G7
UV portion[%]: 6.9
Visible portion[%]: 43.2
IR portion[%]: 49.9
Metalicity : -0.8
Absolute Magnitude: 4.0
Apparent Magnitude: 13.2
Right Ascension(RA) 299.5017
Declination (DEC) 40.6708
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-399+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-399%20c/
Kepler-399 c
Kepler-399 c

  • Kepler-399 c is an exoplanet orbiting the star Kepler-399, located about 2205.2 light-years (676.1 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kepler-399 has apparent magnitude of 13.2, with absolute magnitude of 4.0.
  • It is 0.9 times more massive and 1.2 times bigger compared with our Sun. The surface temperature is 5467 with its spectral types of G7
  • In this planetary system, the extrasolar planet Kepler-399 c orbits around the star Kepler-399 every 26.7 days with its orbital distance of 0.15 AU ( 23187670.0 km)
  • (Projected orbit of Kepler-399 c around its host star Kepler-399)


  • The Star Kepler-399 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.746 AU ( 111585750.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.031 AU ( 154240668.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.571 AU ( 235028645.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.312 AU ( 345854947.1 km)
  • Radiation at Planetary Boundary of Kepler-399 c : 60512.16 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-399)



  • Kopparapu Recent Venus for Star Kepler-399 distance : 0.787 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-399 distance : 0.997 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-399 distance : 0.963 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-399 distance : 1.056 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-399 distance : 1.777 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-399 distance : 1.874 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-399)



  • Original Kopparapu Recent Venus for Star Kepler-399 distance : 0.784 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-399 distance : 1.026 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-399 distance : 1.037 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-399 distance : 1.807 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-399 distance : 1.880 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-399)



    (Position in Stellar Map of star Kepler-399 and its Exoplanet Kepler-399 c)



    (Zoomed position in Stellar Map of star Kepler-399 and its Exoplanet Kepler-399 c (zoom level 3))

    (Synthetic Spectrum of star Kepler-399*)
    *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