Kepler-20

Display orbital revolution around the star Kepler-20
Imaginary Picture of Star Kepler-20
Star Name : Kepler-20
Alternate Name : "2MASS J19104752+4220194, KIC 6850504, KOI-70, Kepler-20 A, WISE J191047.52+422019.0"
Star Distance (LY/pc): 929.1532 (LY) 284.8800 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 0.9600 (Rsun, estimated)
Stellar Mass (Msun): 0.9500 (Msun/observed) 0.9500 (Msun/estimated)
Spectral type : G8
Metalicity : 0.0700
Absolute Magnitude : 5.23
Apparent Magnitude : 12.50
Right Ascension(RA) : 287.69800
Declination(DEC) : 42.33873
  • This is the Kepler-20 . The star Kepler-20 islocated about 929.2 light-years (284.9 pc) away from our Solar System.
  • The star Kepler-20 has apparent magnitude of 12.5, with absolute magnitude of 5.2.
  • It is 0.9 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5495 with its spectral types of G8
  • Number of Extrasolar Planets : 6
  • Name of the 1 Planet Kepler-20 b radius 0.167000 mass 0.030520 orbital distance 0.046300
  • Name of the 2 Planet Kepler-20 c radius 0.272000 mass 0.040120 orbital distance 0.094900
  • Name of the 3 Planet Kepler-20 d radius 0.245000 mass 0.031680 orbital distance 0.350600
  • Name of the 4 Planet Kepler-20 e radius 0.077000 mass 0.009700 orbital distance 0.063900
  • Name of the 5 Planet Kepler-20 f radius 0.089000 mass 0.045000 orbital distance 0.139600
  • Name of the 6 Planet Kepler-20 g radius 0.230450 mass 0.062800 orbital distance 0.205500
    (Illustration of the Kepler-20's Planetary System)



    The Star Kepler-20 's habitable zone is located at the following distance

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.628 AU ( 93943067.9 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.868 AU ( 129853870.2 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.323 AU ( 197868561.5 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.946 AU ( 291172256.3 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-20)



    Kopparapu's Recent Venus for Star Kepler-20 distance : 0.662 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star Kepler-20 distance : 0.838 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-20 distance : 0.809 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star Kepler-20 distance : 0.888 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star Kepler-20 distance : 1.492 AU
    Kopparapu's Outer Boundary for Early Mars for Star Kepler-20 distance : 1.574 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-20)



  • Original Kopparapu Recent Venus for Star Kepler-20 distance : 0.659 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-20 distance : 0.862 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-20 distance : 0.872 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-20 distance : 1.518 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-20 distance : 1.579 AU

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



    (Position in Stellar Map of star Kepler-20 )



    (Zoomed position in Stellar Map of star Kepler-20 (zoom level 3))

    (Synthetic Spectrum of star HD 220689*)
    *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