Imaginary Picture of K2-66 b
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Exoplanet Name : K2-66 b
Alternate Name :
Radius (Rjup / Re): 0.2220 (Rjup) 2.4884 (Rearth)
Mass (Mjup / Me): 0.0670 (Mjup) 21.3018 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0598 (AU) 0.0598 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0139
Orbital Period(Observed/Estimated) 5.07 (Days Obs.) 5.07 (Days Est.)
Star Radiation at Atmospheric Boundary: 1147561.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1460.8 (K)
Blackbody T 0.3(K) 1371.8 (K)
Blackbody T 0.7(K) 1110.0 (K)
Tidally Locked Blackbody T 0.1(K) 1737.2 (K)
Tidally Locked Blackbody T 0.3(K) 1631.4 (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 : K2-66
Alternate Name : "2MASS J22060640-1042414, TYC 5805-449-1, EPIC 206153219"
Star Distance(LY) : 0.0
Stellar Radius(Rsun) : 1.7 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5887 (K)
Spectral type : G1
Metalicity : -0.0
Absolute Magnitude: 25.0
Apparent Magnitude: 11.7
Right Ascension(RA) 331.5267
Declination (DEC) -10.7116
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK
Open Exoplanet Database Link
K2-66 b
K2-66 b

  • K2-66 b is an exoplanet orbiting the star K2-66. Its discovery was publicly announced on 2017.
  • The host star K2-66 has apparent magnitude of 11.7, with absolute magnitude of 25.0.
  • It is 1.1 times more massive and 1.7 times bigger compared with our Sun. The surface temperature is 5887 with its spectral types of G1
  • In this planetary system, the extrasolar planet K2-66 b orbits around the star K2-66 every 5.1 days with its orbital distance of 0.06 AU ( 8950440.6 km)
  • (Projected orbit of K2-66 b around its host star K2-66)


  • The Star K2-66 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.254 AU ( 187569687.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.733 AU ( 259270326.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.641 AU ( 395070600.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.886 AU ( 581363695.8 km)
  • Radiation at Planetary Boundary of K2-66 b : 1147561.29 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-66)



  • Kopparapu Recent Venus for Star K2-66 distance : 1.291 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-66 distance : 1.635 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-66 distance : 1.579 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-66 distance : 1.731 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-66 distance : 2.879 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-66 distance : 3.036 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-66)



  • Original Kopparapu Recent Venus for Star K2-66 distance : 1.296 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-66 distance : 1.679 AU
  • Original Kopparapu Moist Greenhouse for Star K2-66 distance : 1.714 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-66 distance : 2.930 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-66 distance : 3.047 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-66)



    (Position in Stellar Map of star K2-66 and its Exoplanet K2-66 b)



    (Zoomed position in Stellar Map of star K2-66 and its Exoplanet K2-66 b (zoom level 3))