Imaginary Picture of Kepler-258 b

Display orbital revolution of Kepler-258 b around the hoststar Kepler-258
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Exoplanet Name : Kepler-258 b
Alternate Name : "2MASS J19361643+4634455 b, K00951.01, KIC 9775938 b, KOI-951 b, KOI-951.01, WISE J193616.42+463444.9 b"
Status : Confirmed
Radius (Rjup / Re): 0.3620 (Rjup) 4.0577 (Rearth)
Mass (Mjup / Me): 0.0305 (Mjup) 9.7053 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1030 (AU) 0.1030 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0361
Orbital Period(Observed/Estimated) 13.20 (Days Obs.) 13.50 (Days Est.)
Surface Gravity (G Earth) 0.5895
Star Radiation at Atmospheric Boundary: 37716.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 622.0 (K)
Blackbody T 0.3(K) 584.1 (K)
Blackbody T 0.7(K) 472.6 (K)
Tidally Locked Blackbody T 0.1(K) 739.7 (K)
Tidally Locked Blackbody T 0.3(K) 694.6 (K)
Size Class: Neptune-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-258
Alternate Name : "2MASS J19361643+4634455, KIC 9775938, KOI-951, WISE J193616.42+463444.9"
Star Distance(LY) : 1878.2
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4944 (K)
Spectral type : K2
UV portion[%]: 3.0
Visible portion[%]: 36.5
IR portion[%]: 60.5
Metalicity : 0.4
Absolute Magnitude: 4.8
Apparent Magnitude: 13.6
Right Ascension(RA) 294.0685
Declination (DEC) 46.5793
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-258+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-258%20b/
Kepler-258 b
Kepler-258 b

  • Kepler-258 b is an exoplanet orbiting the star Kepler-258, located about 1878.2 light-years (575.9 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kepler-258 has apparent magnitude of 13.6, with absolute magnitude of 4.8.
  • It is 0.8 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4944 with its spectral types of K2
  • In this planetary system, the extrasolar planet Kepler-258 b orbits around the star Kepler-258 every 13.2 days with its orbital distance of 0.10 AU ( 15408580.7 km)
  • (Projected orbit of Kepler-258 b around its host star Kepler-258)


  • The Star Kepler-258 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.391 AU ( 58540910.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.541 AU ( 80918837.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.824 AU ( 123302400.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.213 AU ( 181444884.2 km)
  • Radiation at Planetary Boundary of Kepler-258 b : 37716.65 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-258)



  • Kopparapu Recent Venus for Star Kepler-258 distance : 0.424 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-258 distance : 0.537 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-258 distance : 0.519 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-258 distance : 0.570 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-258 distance : 0.976 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-258 distance : 1.030 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-258)



  • Original Kopparapu Recent Venus for Star Kepler-258 distance : 0.420 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-258 distance : 0.554 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-258 distance : 0.555 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-258 distance : 0.993 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-258 distance : 1.032 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-258)



    (Position in Stellar Map of star Kepler-258 and its Exoplanet Kepler-258 b)



    (Zoomed position in Stellar Map of star Kepler-258 and its Exoplanet Kepler-258 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-258*)
    *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