Imaginary Picture of Kepler-1865 b

Display orbital revolution of Kepler-1865 b around the hoststar Kepler-1865
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Exoplanet Name : Kepler-1865 b
Alternate Name : "KOI-2638 b, KOI-2638.01"
Status : Confirmed
Radius (Rjup / Re): 0.1407 (Rjup) 1.5768 (Rearth)
Mass (Mjup / Me): 0.0127 (Mjup) 4.0295 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0344 (AU) 0.0344 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0069
Orbital Period(Observed/Estimated) 2.52 (Days Obs.) 2.50 (Days Est.)
Surface Gravity (G Earth) 1.6206
Star Radiation at Atmospheric Boundary: 539026.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1209.3 (K)
Blackbody T 0.3(K) 1135.7 (K)
Blackbody T 0.7(K) 918.9 (K)
Tidally Locked Blackbody T 0.1(K) 1438.1 (K)
Tidally Locked Blackbody T 0.3(K) 1350.6 (K)
Size Class: super-Earth-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-1865
Alternate Name : "KIC 6211812, KOI-2638"
Star Distance(LY) : 3008.0
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 11.6 (GY)
Temperature : 5147 (K)
Spectral type : G9/K0V
UV portion[%]: 4.4
Visible portion[%]: 39.3
IR portion[%]: 56.3
Metalicity : -0.1
Absolute Magnitude: 5.6
Apparent Magnitude: 15.5
Right Ascension(RA) 293.9412
Declination (DEC) 41.5905
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-1865 b
Kepler-1865 b

  • Kepler-1865 b is an exoplanet orbiting the star Kepler-1865, located about 3008.0 light-years (922.3 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star Kepler-1865 has apparent magnitude of 15.5, with absolute magnitude of 5.6.
  • It is 0.9 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5147 with its spectral types of G9/K0V
  • In this planetary system, the extrasolar planet Kepler-1865 b orbits around the star Kepler-1865 every 2.5 days with its orbital distance of 0.03 AU ( 5146166.8 km)
  • (Projected orbit of Kepler-1865 b around its host star Kepler-1865)


  • The Star Kepler-1865 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.494 AU ( 73912715.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.683 AU ( 102166688.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.041 AU ( 155679423.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.531 AU ( 229089091.3 km)
  • Radiation at Planetary Boundary of Kepler-1865 b : 539026.37 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1865)



  • Kopparapu Recent Venus for Star Kepler-1865 distance : 0.531 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1865 distance : 0.672 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1865 distance : 0.649 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1865 distance : 0.712 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1865 distance : 1.211 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1865 distance : 1.277 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1865)



  • Original Kopparapu Recent Venus for Star Kepler-1865 distance : 0.526 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1865 distance : 0.692 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1865 distance : 0.696 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1865 distance : 1.231 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1865 distance : 1.280 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1865)



    (Position in Stellar Map of star Kepler-1865 and its Exoplanet Kepler-1865 b)



    (Zoomed position in Stellar Map of star Kepler-1865 and its Exoplanet Kepler-1865 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-1865*)
    *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