Imaginary Picture of Kepler-20 g

Display orbital revolution of Kepler-20 g around the hoststar Kepler-20
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Exoplanet Name : Kepler-20 g
Alternate Name : "2MASS J19104752+4220194 g, KIC 6850504 g, KOI-70 g, Kepler-20 A g, WISE J191047.52+422019.0 g"
Status : Confirmed
Radius (Rjup / Re): 0.2304 (Rjup) 2.5831 (Rearth)
Mass (Mjup / Me): 0.0628 (Mjup) 19.9665 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.2055 (AU) 0.2055 (AU Est.)
Eccentricity : 0.1500
Orbital Period(Yrs) 0.0957
Orbital Period(Observed/Estimated) 34.94 (Days Obs.) 34.91 (Days Est.)
Surface Gravity (G Earth) 2.9924
Star Radiation at Atmospheric Boundary: 21028.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 537.5 (K)
Blackbody T 0.3(K) 504.7 (K)
Blackbody T 0.7(K) 408.4 (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 : Radial Velocity
Mass Detection : Theoretical
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : Kepler-20
Alternate Name : "2MASS J19104752+4220194, KIC 6850504, KOI-70, Kepler-20 A, WISE J191047.52+422019.0"
Star Distance(LY) : 921.4
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 7.6 (GY)
Temperature : 5508 (K)
Spectral type : G8
UV portion[%]: 6.9
Visible portion[%]: 43.2
IR portion[%]: 49.9
Metalicity : 0.1
Absolute Magnitude: 5.2
Apparent Magnitude: 12.5
Right Ascension(RA) 287.6980
Declination (DEC) 42.3387
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK
Open Exoplanet Database Link
Kepler-20 g
Kepler-20 g

  • Kepler-20 g is an exoplanet orbiting the star Kepler-20, located about 921.4 light-years (282.5 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-20 has apparent magnitude of 12.5, with absolute magnitude of 5.2.
  • It is 0.9 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5508 with its spectral types of G8
  • In this planetary system, the extrasolar planet Kepler-20 g orbits around the star Kepler-20 every 34.9 days with its orbital distance of 0.21 AU ( 30742362.4 km)
  • (Projected orbit of Kepler-20 g around its host star Kepler-20)


  • The Star Kepler-20 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.583 AU ( 87210664.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.806 AU ( 120547929.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.228 AU ( 183688366.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.807 AU ( 270305478.7 km)
  • Radiation at Planetary Boundary of Kepler-20 g : 21028.30 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-20)



  • Kopparapu Recent Venus for Star Kepler-20 distance : 0.614 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-20 distance : 0.777 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-20 distance : 0.751 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-20 distance : 0.823 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-20 distance : 1.384 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-20 distance : 1.459 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-20)



  • Original Kopparapu Recent Venus for Star Kepler-20 distance : 0.612 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-20 distance : 0.800 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-20 distance : 0.809 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-20 distance : 1.408 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-20 distance : 1.464 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-20)



    (Position in Stellar Map of star Kepler-20 and its Exoplanet Kepler-20 g)



    (Zoomed position in Stellar Map of star Kepler-20 and its Exoplanet Kepler-20 g (zoom level 3))

    (Synthetic Spectrum of star Kepler-20*)
    *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