Imaginary Picture of Kepler-1398 c

Display orbital revolution of Kepler-1398 c around the hoststar Kepler-1398
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Exoplanet Name : Kepler-1398 c
Alternate Name : "2MASS J19392788+4838203 c, K02977.02, KIC 11090556 c, KOI-2977 c, KOI-2977.02, WISE J193927.87+483820.3 c"
Status : Confirmed
Radius (Rjup / Re): 0.0920 (Rjup) 1.0312 (Rearth)
Mass (Mjup / Me): 0.0034 (Mjup) 1.0925 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0525 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0113
Orbital Period(Observed/Estimated) 4.14 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.0273
Star Radiation at Atmospheric Boundary: 950026.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1393.4 (K)
Blackbody T 0.3(K) 1308.6 (K)
Blackbody T 0.7(K) 1058.8 (K)
Tidally Locked Blackbody T 0.1(K) 1657.0 (K)
Tidally Locked Blackbody T 0.3(K) 1556.1 (K)
Size Class: 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-1398
Alternate Name : "2MASS J19392788+4838203, KIC 11090556, KOI-2977, WISE J193927.87+483820.3"
Star Distance(LY) : 2778.0
Stellar Radius(Rsun) : 1.3 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 3.1 (GY)
Temperature : 5969 (K)
Spectral type : G0
UV portion[%]: 0.3
Visible portion[%]: 1.5
IR portion[%]: 98.2
Metalicity : 0.0
Absolute Magnitude: 3.0
Apparent Magnitude: 12.7
Right Ascension(RA) 294.8662
Declination (DEC) 48.6390
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Timothy D. Morton, Stephen T. Bryson, Jeffrey L. Coughlin, Jason F. Rowe, Ganesh Ravichandran, Erik A. Petigura, Michael R. Haas, and Natalie M. Batalha2"
Discovery Paper - Title FALSE POSITIVE PROBABILITIES FOR ALL KEPLER OBJECTS OF INTEREST: 1284 NEWLY VALIDATED PLANETS AND 428 LIKELY FALSE POSITIVES
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-1398+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-1398%20c/
Kepler-1398 c
Kepler-1398 c

  • Kepler-1398 c is an exoplanet orbiting the star Kepler-1398, located about 2778.0 light-years (851.8 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-1398 has apparent magnitude of 12.7, with absolute magnitude of 3.0.
  • It is 1.1 times more massive and 1.3 times bigger compared with our Sun. The surface temperature is 5969 with its spectral types of G0
  • In this planetary system, the extrasolar planet Kepler-1398 c orbits around the star Kepler-1398 every 4.1 days with its orbital distance of 0.05 AU ( 7860274.4 km)
  • (Projected orbit of Kepler-1398 c around its host star Kepler-1398)


  • The Star Kepler-1398 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.002 AU ( 149877335.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.385 AU ( 207169644.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.110 AU ( 315680692.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.105 AU ( 464537967.6 km)
  • Radiation at Planetary Boundary of Kepler-1398 c : 950026.94 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1398)



  • Kopparapu Recent Venus for Star Kepler-1398 distance : 1.026 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1398 distance : 1.300 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1398 distance : 1.255 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1398 distance : 1.376 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1398 distance : 2.284 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1398 distance : 2.409 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1398)



  • Original Kopparapu Recent Venus for Star Kepler-1398 distance : 1.032 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1398 distance : 1.335 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1398 distance : 1.365 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1398 distance : 2.325 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1398 distance : 2.418 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1398)



    (Position in Stellar Map of star Kepler-1398 and its Exoplanet Kepler-1398 c)



    (Zoomed position in Stellar Map of star Kepler-1398 and its Exoplanet Kepler-1398 c (zoom level 3))

    (Synthetic Spectrum of star Kepler-1398*)
    *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