Imaginary Picture of Kepler-8 b
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Exoplanet Name : Kepler-8 b
Alternate Name :
Radius (Rjup / Re): 1.4190 (Rjup) 15.9056 (Rearth)
Mass (Mjup / Me): 0.6030 (Mjup) 191.7166 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0483 (AU) 0.0483 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0096
Orbital Period(Observed/Estimated) 3.52 (Days Obs.) 3.52 (Days Est.)
Star Radiation at Atmospheric Boundary: 1891232.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1655.1 (K)
Blackbody T 0.3(K) 1554.3 (K)
Blackbody T 0.7(K) 1257.6 (K)
Tidally Locked Blackbody T 0.1(K) 1968.3 (K)
Tidally Locked Blackbody T 0.3(K) 1848.4 (K)
Size Class: Super-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-8
Alternate Name :
Star Distance(LY) : 3330.8
Stellar Radius(Rsun) : 1.6 (Rsun Measured)
Stellar Mass(Msun) : 1.2 (Msun Measured) 1.2 (Msun Estimated)
Star Age : 3.8 (GY)
Temperature : 6181 (K)
Spectral type : F8
Metalicity : -0.1
Absolute Magnitude: 3.9
Apparent Magnitude: 13.9
Right Ascension(RA) 281.2875
Declination (DEC) 42.4511
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Jon M. Jenkins1, William J. Borucki2, David G. Koch2, Geoffrey W. Marcy3, William D. Cochran4, William F. Welsh5, Gibor Basri3, Natalie M. Batalha6, Lars A. Buchhave7,8, Timothy M. Brown9Show full author list "
Discovery Paper - Title DISCOVERY AND ROSSITER-McLAUGHLIN EFFECT OF EXOPLANET KEPLER-8b*
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-8+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-8%20b/
Kepler-8 b
Kepler-8 b

  • Kepler-8 b is an exoplanet orbiting the star Kepler-8, located about 3330.8 light-years (1021.2 pc) away from Solar System. Its discovery was publicly announced on 2010.
  • The host star Kepler-8 has apparent magnitude of 13.9, with absolute magnitude of 3.9.
  • It is 1.2 times more massive and 1.6 times bigger compared with our Sun. The surface temperature is 6181 with its spectral types of F8
  • In this planetary system, the extrasolar planet Kepler-8 b orbits around the star Kepler-8 every 3.5 days with its orbital distance of 0.05 AU ( 7225577.2 km)
  • (Projected orbit of Kepler-8 b around its host star Kepler-8)


  • The Star Kepler-8 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.299 AU ( 194390596.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.796 AU ( 268698604.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.737 AU ( 409437210.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.027 AU ( 602504791.3 km)
  • Radiation at Planetary Boundary of Kepler-8 b : 1891232.09 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-8)



  • Kopparapu Recent Venus for Star Kepler-8 distance : 1.314 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-8 distance : 1.664 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-8 distance : 1.607 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-8 distance : 1.762 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-8 distance : 2.912 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-8 distance : 3.071 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-8)



  • Original Kopparapu Recent Venus for Star Kepler-8 distance : 1.327 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-8 distance : 1.708 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-8 distance : 1.756 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-8 distance : 2.964 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-8 distance : 3.082 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-8)



    (Position in Stellar Map of star Kepler-8 and its Exoplanet Kepler-8 b)



    (Zoomed position in Stellar Map of star Kepler-8 and its Exoplanet Kepler-8 b (zoom level 3))