Imaginary Picture of K2-266 b

Display orbital revolution of K2-266 b around the hoststar K2-266
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Exoplanet Name : K2-266 b
Alternate Name : "2MASS J10314450+0056152 b, EPIC 248435473 A b, EPIC 248435473 b, K2-266 A b, WISE J103144.54+005614.5 b"
Radius (Rjup / Re): 0.2940 (Rjup) 3.2954 (Rearth)
Mass (Mjup / Me): 0.0355 (Mjup) 11.2868 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0131 (AU) 0.0131 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0018
Orbital Period(Observed/Estimated) 0.66 (Days Obs.) 0.66 (Days Est.)
Surface Gravity (G Earth) 1.0393
Star Radiation at Atmospheric Boundary: 1187730.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1473.4 (K)
Blackbody T 0.3(K) 1383.7 (K)
Blackbody T 0.7(K) 1119.5 (K)
Tidally Locked Blackbody T 0.1(K) 1752.2 (K)
Tidally Locked Blackbody T 0.3(K) 1645.5 (K)
Size Class: Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-266
Alternate Name : "2MASS J10314450+0056152, EPIC 248435473, EPIC 248435473 A, K2-266 A, WISE J103144.54+005614.5"
Star Distance(LY) : 251.7
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 0.7 (Msun Estimated)
Star Age : 8.4 (GY)
Temperature : 4285 (K)
Spectral type : K
UV portion[%]: 0.9
Visible portion[%]: 27.4
IR portion[%]: 71.7
Metalicity : -0.1
Absolute Magnitude: 5.2
Apparent Magnitude: 9.6
Right Ascension(RA) 157.9354
Declination (DEC) 0.9376
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
K2-266 b
K2-266 b

  • K2-266 b is an exoplanet orbiting the star K2-266, located about 251.7 light-years (77.2 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-266 has apparent magnitude of 9.6, with absolute magnitude of 5.2.
  • It is 0.7 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4285 with its spectral types of K
  • In this planetary system, the extrasolar planet K2-266 b orbits around the star K2-266 every 0.7 days with its orbital distance of 0.01 AU ( 1953748.2 km)
  • (Projected orbit of K2-266 b around its host star K2-266)


  • The Star K2-266 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.278 AU ( 41654104.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.385 AU ( 57576858.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.586 AU ( 87734390.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.863 AU ( 129104998.8 km)
  • Radiation at Planetary Boundary of K2-266 b : 1187730.32 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-266)



  • Kopparapu Recent Venus for Star K2-266 distance : 0.310 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-266 distance : 0.392 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-266 distance : 0.379 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-266 distance : 0.416 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-266 distance : 0.734 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-266 distance : 0.774 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-266)



  • Original Kopparapu Recent Venus for Star K2-266 distance : 0.306 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-266 distance : 0.405 AU
  • Original Kopparapu Moist Greenhouse for Star K2-266 distance : 0.404 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-266 distance : 0.745 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-266 distance : 0.775 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-266)



    (Position in Stellar Map of star K2-266 and its Exoplanet K2-266 b)



    (Zoomed position in Stellar Map of star K2-266 and its Exoplanet K2-266 b (zoom level 3))

    (Synthetic Spectrum of star K2-266*)
    *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