Imaginary Picture of Kepler-4 b
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Exoplanet Name : Kepler-4 b
Alternate Name :
Radius (Rjup / Re): 0.3570 (Rjup) 4.0016 (Rearth)
Mass (Mjup / Me): 0.0770 (Mjup) 24.4812 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0456 (AU) 0.0456 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0088
Orbital Period(Observed/Estimated) 3.21 (Days Obs.) 3.22 (Days Est.)
Star Radiation at Atmospheric Boundary: 1583303.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1583.2 (K)
Blackbody T 0.3(K) 1486.8 (K)
Blackbody T 0.7(K) 1203.0 (K)
Tidally Locked Blackbody T 0.1(K) 1882.7 (K)
Tidally Locked Blackbody T 0.3(K) 1768.1 (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-4
Alternate Name :
Star Distance(LY) : 1591.1
Stellar Radius(Rsun) : 1.5 (Rsun Measured)
Stellar Mass(Msun) : 1.2 (Msun Measured) 1.2 (Msun Estimated)
Star Age : 4.5 (GY)
Temperature : 5827 (K)
Spectral type : G0
Metalicity : 0.2
Absolute Magnitude: 4.3
Apparent Magnitude: 12.7
Right Ascension(RA) 285.6167
Declination (DEC) 50.1358
Hubble Space Telescope Guide Star Catalog (GSC) ID 03549-02067
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-4+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-4%20b/
Kepler-4 b
Kepler-4 b

  • Kepler-4 b is an exoplanet orbiting the star Kepler-4, located about 1591.1 light-years (487.8 pc) away from Solar System. Its discovery was publicly announced on 2010.
  • The host star Kepler-4 has apparent magnitude of 12.7, with absolute magnitude of 4.3.
  • It is 1.2 times more massive and 1.5 times bigger compared with our Sun. The surface temperature is 5827 with its spectral types of G0
  • In this planetary system, the extrasolar planet Kepler-4 b orbits around the star Kepler-4 every 3.2 days with its orbital distance of 0.05 AU ( 6821662.9 km)
  • (Projected orbit of Kepler-4 b around its host star Kepler-4)


  • The Star Kepler-4 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.122 AU ( 167920099.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.552 AU ( 232109459.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.364 AU ( 353683451.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.479 AU ( 520460692.3 km)
  • Radiation at Planetary Boundary of Kepler-4 b : 1583303.84 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-4)



  • Kopparapu Recent Venus for Star Kepler-4 distance : 1.160 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-4 distance : 1.469 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-4 distance : 1.419 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-4 distance : 1.555 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-4 distance : 2.591 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-4 distance : 2.732 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-4)



  • Original Kopparapu Recent Venus for Star Kepler-4 distance : 1.163 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-4 distance : 1.509 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-4 distance : 1.538 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-4 distance : 2.636 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-4 distance : 2.742 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-4)



    (Position in Stellar Map of star Kepler-4 and its Exoplanet Kepler-4 b)



    (Zoomed position in Stellar Map of star Kepler-4 and its Exoplanet Kepler-4 b (zoom level 3))