Imaginary Picture of Kepler-122 d
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Exoplanet Name : Kepler-122 d
Alternate Name :
Radius (Rjup / Re): 0.1960 (Rjup) 2.1970 (Rearth)
Mass (Mjup / Me): 0.0173 (Mjup) 5.4854 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1550 (AU) 0.1550 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0591
Orbital Period(Observed/Estimated) 21.59 (Days Obs.) 22.40 (Days Est.)
Star Radiation at Atmospheric Boundary: 101784.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 797.2 (K)
Blackbody T 0.3(K) 748.6 (K)
Blackbody T 0.7(K) 605.7 (K)
Tidally Locked Blackbody T 0.1(K) 948.0 (K)
Tidally Locked Blackbody T 0.3(K) 890.3 (K)
Size Class: sub-Neptune-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-122
Alternate Name :
Star Distance(LY) : 0.0
Stellar Radius(Rsun) : 1.2 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 6050 (K)
Spectral type : G0
Metalicity : -0.2
Absolute Magnitude: 25.0
Apparent Magnitude: 13.2
Right Ascension(RA) 291.1119
Declination (DEC) 39.9491
Hubble Space Telescope Guide Star Catalog (GSC) ID 0
Discovered by
Discovery Paper - Authors "Hadden, Sam; Lithwick, Yoram"
Discovery Paper - Title Densities and Eccentricities of 140 Kepler Planets from Transit Time Variations
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK 0
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-122%20d/
Kepler-122 d
Kepler-122 d

  • Kepler-122 d is an exoplanet orbiting the star Kepler-122. Its discovery was publicly announced on 2014.
  • The host star Kepler-122 has apparent magnitude of 13.2, with absolute magnitude of 25.0.
  • It is 1.0 times more massive and 1.2 times bigger compared with our Sun. The surface temperature is 6050 with its spectral types of G0
  • In this planetary system, the extrasolar planet Kepler-122 d orbits around the star Kepler-122 every 21.6 days with its orbital distance of 0.15 AU ( 23187670.0 km)
  • (Projected orbit of Kepler-122 d around its host star Kepler-122)


  • The Star Kepler-122 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.967 AU ( 144720046.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.337 AU ( 200040923.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.038 AU ( 304818098.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.998 AU ( 448553185.5 km)
  • Radiation at Planetary Boundary of Kepler-122 d : 101784.72 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-122)



  • Kopparapu Recent Venus for Star Kepler-122 distance : 0.986 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-122 distance : 1.249 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-122 distance : 1.206 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-122 distance : 1.322 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-122 distance : 2.191 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-122 distance : 2.311 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-122)



  • Original Kopparapu Recent Venus for Star Kepler-122 distance : 0.993 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-122 distance : 1.282 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-122 distance : 1.314 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-122 distance : 2.230 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-122 distance : 2.319 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-122)



    (Position in Stellar Map of star Kepler-122 and its Exoplanet Kepler-122 d)



    (Zoomed position in Stellar Map of star Kepler-122 and its Exoplanet Kepler-122 d (zoom level 3))