Imaginary Picture of Kepler-1787 b

Display orbital revolution of Kepler-1787 b around the hoststar Kepler-1787
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Exoplanet Name : Kepler-1787 b
Alternate Name : "KOI-2056 b, KOI-2056.01"
Status : Confirmed
Radius (Rjup / Re): 0.2069 (Rjup) 2.3189 (Rearth)
Mass (Mjup / Me): 0.0181 (Mjup) 5.7680 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.2270 (AU) 0.2270 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.1076
Orbital Period(Observed/Estimated) 39.31 (Days Obs.) 38.74 (Days Est.)
Surface Gravity (G Earth) 1.0726
Star Radiation at Atmospheric Boundary: 21019.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 537.4 (K)
Blackbody T 0.3(K) 504.7 (K)
Blackbody T 0.7(K) 408.3 (K)
Tidally Locked Blackbody T 0.1(K) 639.1 (K)
Tidally Locked Blackbody T 0.3(K) 600.2 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : Kepler-1787
Alternate Name : "10134152, KOI-2056"
Star Distance(LY) : 2539.5
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.3 (GY)
Temperature : 5808 (K)
Spectral type : G1.5V
UV portion[%]: 0.3
Visible portion[%]: 1.5
IR portion[%]: 98.2
Metalicity : -0.2
Absolute Magnitude: 5.1
Apparent Magnitude: 14.6
Right Ascension(RA) 289.0643
Declination (DEC) 47.1174
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK
Open Exoplanet Database Link
Kepler-1787 b
Kepler-1787 b

  • Kepler-1787 b is an exoplanet orbiting the star Kepler-1787, located about 2539.5 light-years (778.6 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star Kepler-1787 has apparent magnitude of 14.6, with absolute magnitude of 5.1.
  • It is 1.0 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5808 with its spectral types of G1.5V
  • In this planetary system, the extrasolar planet Kepler-1787 b orbits around the star Kepler-1787 every 39.3 days with its orbital distance of 0.23 AU ( 33958716.6 km)
  • (Projected orbit of Kepler-1787 b around its host star Kepler-1787)


  • The Star Kepler-1787 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.644 AU ( 96313515.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.890 AU ( 133130448.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.356 AU ( 202861341.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.995 AU ( 298519351.2 km)
  • Radiation at Planetary Boundary of Kepler-1787 b : 21018.97 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1787)



  • Kopparapu Recent Venus for Star Kepler-1787 distance : 0.666 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1787 distance : 0.843 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1787 distance : 0.815 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1787 distance : 0.893 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1787 distance : 1.488 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1787 distance : 1.570 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1787)



  • Original Kopparapu Recent Venus for Star Kepler-1787 distance : 0.667 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1787 distance : 0.867 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1787 distance : 0.883 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1787 distance : 1.515 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1787 distance : 1.575 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1787)



    (Position in Stellar Map of star Kepler-1787 and its Exoplanet Kepler-1787 b)



    (Zoomed position in Stellar Map of star Kepler-1787 and its Exoplanet Kepler-1787 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-1787*)
    *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