Imaginary Picture of Kepler-420 A b
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Exoplanet Name : Kepler-420 A b
Alternate Name : KOI-1257 b
Radius (Rjup / Re): 0.9400 (Rjup) 10.5365 (Rearth)
Mass (Mjup / Me): 1.4500 (Mjup) 461.0101 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.3820 (AU) 0.3820 (AU Est.)
Eccentricity : 0.7720
Orbital Period(Yrs) 0.2372
Orbital Period(Observed/Estimated) 86.65 (Days Obs.) 86.67 (Days Est.)
Star Radiation at Atmospheric Boundary: 9963.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 445.9 (K)
Blackbody T 0.3(K) 418.7 (K)
Blackbody T 0.7(K) 338.8 (K)
Tidally Locked Blackbody T 0.1(K) 530.3 (K)
Tidally Locked Blackbody T 0.3(K) 498.0 (K)
Size Class: Jupiter-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-420 A
Alternate Name : KOI-1257
Star Distance(LY) : 2935.4
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 9.3 (GY)
Temperature : 5520 (K)
Spectral type : G5V
Metalicity : 0.3
Absolute Magnitude: 12.2
Apparent Magnitude: 22.0
Right Ascension(RA) 291.2252
Declination (DEC) 44.5942
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-420+&submit=SIMBAD+search
Open Exoplanet Database Link
Kepler-420 A b
Kepler-420 A b

  • Kepler-420 A b is an exoplanet orbiting the star Kepler-420 A, located about 2935.4 light-years (900.0 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kepler-420 A has apparent magnitude of 22.0, with absolute magnitude of 12.2.
  • It is 1.0 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5520 with its spectral types of G5V
  • In this planetary system, the extrasolar planet Kepler-420 A b orbits around the star Kepler-420 A every 86.6 days with its orbital distance of 0.38 AU ( 57146386.6 km)
  • (Projected orbit of Kepler-420 A b around its host star Kepler-420 A)


  • The Star Kepler-420 A 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.746 AU ( 111587285.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.031 AU ( 154242789.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.571 AU ( 235031877.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.312 AU ( 345859703.0 km)
  • Radiation at Planetary Boundary of Kepler-420 A b : 9963.03 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-420 A)



  • Kopparapu Recent Venus for Star Kepler-420 A distance : 0.785 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-420 A distance : 0.994 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-420 A distance : 0.960 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-420 A distance : 1.053 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-420 A distance : 1.768 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-420 A distance : 1.865 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-420 A)



  • Original Kopparapu Recent Venus for Star Kepler-420 A distance : 0.782 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-420 A distance : 1.022 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-420 A distance : 1.035 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-420 A distance : 1.799 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-420 A distance : 1.871 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-420 A)



    (Position in Stellar Map of star Kepler-420 A and its Exoplanet Kepler-420 A b)



    (Zoomed position in Stellar Map of star Kepler-420 A and its Exoplanet Kepler-420 A b (zoom level 3))