Imaginary Picture of K2-122 b
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Exoplanet Name : K2-122 b
Alternate Name : EPIC 212006344 b
Radius (Rjup / Re): 0.1090 (Rjup) 1.2218 (Rearth)
Mass (Mjup / Me): 0.0063 (Mjup) 2.0133 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0288 (AU) 0.0288 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0061
Orbital Period(Observed/Estimated) 2.22 (Days Obs.) 2.22 (Days Est.)
Star Radiation at Atmospheric Boundary: 128504.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 845.0 (K)
Blackbody T 0.3(K) 793.6 (K)
Blackbody T 0.7(K) 642.1 (K)
Tidally Locked Blackbody T 0.1(K) 1004.9 (K)
Tidally Locked Blackbody T 0.3(K) 943.7 (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 : K2-122
Alternate Name : 2MASS J08255432+2021344
Star Distance(LY) : 241.4
Stellar Radius(Rsun) : 0.6 (Rsun Measured)
Stellar Mass(Msun) : 0.6 (Msun Measured) 0.6 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3903 (K)
Spectral type : K7
Metalicity : 0.4
Absolute Magnitude: 17.7
Apparent Magnitude: 22.0
Right Ascension(RA) 126.4763
Declination (DEC) 20.3596
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=EPIC+212006344+&submit=SIMBAD+search
Open Exoplanet Database Link
K2-122 b
K2-122 b

  • K2-122 b is an exoplanet orbiting the star K2-122, located about 241.4 light-years (74.0 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star K2-122 has apparent magnitude of 22.0, with absolute magnitude of 17.7.
  • It is 0.6 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 3903 with its spectral types of K7
  • In this planetary system, the extrasolar planet K2-122 b orbits around the star K2-122 every 2.2 days with its orbital distance of 0.03 AU ( 4308418.7 km)
  • (Projected orbit of K2-122 b around its host star K2-122)


  • The Star K2-122 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.202 AU ( 30213889.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.279 AU ( 41763491.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.425 AU ( 63638318.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.626 AU ( 93646573.2 km)
  • Radiation at Planetary Boundary of K2-122 b : 128504.07 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-122)



  • Kopparapu Recent Venus for Star K2-122 distance : 0.227 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-122 distance : 0.287 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-122 distance : 0.277 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-122 distance : 0.305 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-122 distance : 0.547 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-122 distance : 0.577 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-122)



  • Original Kopparapu Recent Venus for Star K2-122 distance : 0.224 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-122 distance : 0.297 AU
  • Original Kopparapu Moist Greenhouse for Star K2-122 distance : 0.297 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-122 distance : 0.556 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-122 distance : 0.578 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-122)



    (Position in Stellar Map of star K2-122 and its Exoplanet K2-122 b)



    (Zoomed position in Stellar Map of star K2-122 and its Exoplanet K2-122 b (zoom level 3))