Imaginary Picture of Kepler-817 b

Display orbital revolution of Kepler-817 b around the hoststar Kepler-817
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Exoplanet Name : Kepler-817 b
Alternate Name : "2MASS J19441964+3909418 b, K01323.01, KIC 4076098 b, KOI-1323 b, KOI-1323.01"
Radius (Rjup / Re): 0.8060 (Rjup) 9.0345 (Rearth)
Mass (Mjup / Me): 0.5133 (Mjup) 163.1836 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0497 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0109
Orbital Period(Observed/Estimated) 3.99 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.9993
Star Radiation at Atmospheric Boundary: 739207.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1308.7 (K)
Blackbody T 0.3(K) 1229.0 (K)
Blackbody T 0.7(K) 994.4 (K)
Tidally Locked Blackbody T 0.1(K) 1556.3 (K)
Tidally Locked Blackbody T 0.3(K) 1461.5 (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-817
Alternate Name : "2MASS J19441964+3909418, KIC 4076098, KOI-1323"
Star Distance(LY) : 4849.9
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 3.5 (GY)
Temperature : 5924 (K)
Spectral type : G2
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.0
Absolute Magnitude: 3.5
Apparent Magnitude: 14.4
Right Ascension(RA) 296.0819
Declination (DEC) 39.1616
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Timothy D. Morton, Stephen T. Bryson, Jeffrey L. Coughlin, Jason F. Rowe, Ganesh Ravichandran, Erik A. Petigura, Michael R. Haas, and Natalie M. Batalha"
Discovery Paper - Title FALSE POSITIVE PROBABILITIES FOR ALL KEPLER OBJECTS OF INTEREST: 1284 NEWLY VALIDATED PLANETS AND 689 LIKELY FALSE POSITIVES
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-817%20b/
Kepler-817 b
Kepler-817 b

  • Kepler-817 b is an exoplanet orbiting the star Kepler-817, located about 4849.9 light-years (1487.0 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-817 has apparent magnitude of 14.4, with absolute magnitude of 3.5.
  • It is 1.0 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5924 with its spectral types of G2
  • In this planetary system, the extrasolar planet Kepler-817 b orbits around the star Kepler-817 every 4.0 days with its orbital distance of 0.05 AU ( 7438190.7 km)
  • (Projected orbit of Kepler-817 b around its host star Kepler-817)


  • The Star Kepler-817 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.836 AU ( 125106794.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.156 AU ( 172930284.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.761 AU ( 263507484.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.592 AU ( 387762806.6 km)
  • Radiation at Planetary Boundary of Kepler-817 b : 739207.88 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-817)



  • Kopparapu Recent Venus for Star Kepler-817 distance : 0.859 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-817 distance : 1.088 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-817 distance : 1.051 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-817 distance : 1.152 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-817 distance : 1.914 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-817 distance : 2.019 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-817)



  • Original Kopparapu Recent Venus for Star Kepler-817 distance : 0.863 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-817 distance : 1.117 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-817 distance : 1.142 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-817 distance : 1.948 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-817 distance : 2.026 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-817)



    (Position in Stellar Map of star Kepler-817 and its Exoplanet Kepler-817 b)



    (Zoomed position in Stellar Map of star Kepler-817 and its Exoplanet Kepler-817 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-817*)
    *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