Imaginary Picture of Kepler-398 b

Display orbital revolution of Kepler-398 b around the hoststar Kepler-398
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Exoplanet Name : Kepler-398 b
Alternate Name : "2MASS J19255247+4020378 b, K02693.01, KIC 5185897 b, KOI-2693 b, KOI-2693.01, WISE J192552.51+402037.4 b"
Status : Confirmed
Radius (Rjup / Re): 0.0830 (Rjup) 0.9303 (Rearth)
Mass (Mjup / Me): 0.0024 (Mjup) 0.7563 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0440 (AU) 0.0440 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0112
Orbital Period(Observed/Estimated) 4.08 (Days Obs.) 3.10 (Days Est.)
Surface Gravity (G Earth) 0.8738
Star Radiation at Atmospheric Boundary: 110070.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 812.9 (K)
Blackbody T 0.3(K) 763.4 (K)
Blackbody T 0.7(K) 617.7 (K)
Tidally Locked Blackbody T 0.1(K) 966.8 (K)
Tidally Locked Blackbody T 0.3(K) 907.9 (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-398
Alternate Name : "2MASS J19255247+4020378, KIC 5185897, KOI-2693, WISE J192552.51+402037.4"
Star Distance(LY) : 578.4
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 1.2 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4493 (K)
Spectral type : K5
UV portion[%]: 1.5
Visible portion[%]: 31.0
IR portion[%]: 67.5
Metalicity : -0.0
Absolute Magnitude: 5.3
Apparent Magnitude: 11.5
Right Ascension(RA) 291.4687
Declination (DEC) 40.3439
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-398+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-398%20b/
Kepler-398 b
Kepler-398 b

  • Kepler-398 b is an exoplanet orbiting the star Kepler-398, located about 578.4 light-years (177.3 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kepler-398 has apparent magnitude of 11.5, with absolute magnitude of 5.3.
  • It is 1.2 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4493 with its spectral types of K5
  • In this planetary system, the extrasolar planet Kepler-398 b orbits around the star Kepler-398 every 4.1 days with its orbital distance of 0.04 AU ( 6582306.3 km)
  • (Projected orbit of Kepler-398 b around its host star Kepler-398)


  • The Star Kepler-398 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.286 AU ( 42721267.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.395 AU ( 59051956.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.601 AU ( 89982113.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.885 AU ( 132412621.5 km)
  • Radiation at Planetary Boundary of Kepler-398 b : 110070.64 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-398)



  • Kopparapu Recent Venus for Star Kepler-398 distance : 0.315 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-398 distance : 0.399 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-398 distance : 0.386 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-398 distance : 0.424 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-398 distance : 0.740 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-398 distance : 0.781 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-398)



  • Original Kopparapu Recent Venus for Star Kepler-398 distance : 0.311 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-398 distance : 0.412 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-398 distance : 0.412 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-398 distance : 0.752 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-398 distance : 0.782 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-398)



    (Position in Stellar Map of star Kepler-398 and its Exoplanet Kepler-398 b)



    (Zoomed position in Stellar Map of star Kepler-398 and its Exoplanet Kepler-398 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-398*)
    *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