Imaginary Picture of Kepler-20 d
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Exoplanet Name : Kepler-20 d
Alternate Name :
Radius (Rjup / Re): 0.2448 (Rjup) 2.7440 (Rearth)
Mass (Mjup / Me): 0.0317 (Mjup) 10.0723 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.3506 (AU) 0.3506 (AU Est.)
Eccentricity : 0.6000
Orbital Period(Yrs) 0.2125
Orbital Period(Observed/Estimated) 77.61 (Days Obs.) 79.40 (Days Est.)
Star Radiation at Atmospheric Boundary: 7224.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 411.5 (K)
Blackbody T 0.3(K) 386.4 (K)
Blackbody T 0.7(K) 312.7 (K)
Tidally Locked Blackbody T 0.1(K) 489.3 (K)
Tidally Locked Blackbody T 0.3(K) 459.5 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : Kepler-20
Alternate Name :
Star Distance(LY) : 921.4
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 8.8 (GY)
Temperature : 5508 (K)
Spectral type : G8
Metalicity : 0.0
Absolute Magnitude: 5.2
Apparent Magnitude: 12.5
Right Ascension(RA) 287.7000
Declination (DEC) 42.3386
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors CUTRI R.M.; SKRUTSKIE M.F.; VAN DYK S.; BEICHMAN C.A.; CARPENTER J.M.; CHESTER T.; CAMBRESY L.; EVANS T.; FOWLER J.; GIZIS J.; HOWARD E.; HUCHRA J.; JARRETT T.; KOPAN E.L.; KIRKPATRICK J.D.; LIGHT R.M.; MARSH K.A.; McCALLON H.; SCHNEIDER S.; STIENING R.; SYKES M.; WEINBERG M.; WHEATON W.A.; WHEELOCK S.; ZACARIAS N.
Discovery Paper - Title 2MASS All Sky Catalog of point sources.
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-20%20d/
Kepler-20 d
Kepler-20 d

  • Kepler-20 d 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 2011.
  • 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 d orbits around the star Kepler-20 every 77.6 days with its orbital distance of 0.35 AU ( 52449013.5 km)
  • (Projected orbit of Kepler-20 d 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 d : 7224.44 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 d)



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