Imaginary Picture of Kepler-1266 c

Display orbital revolution of Kepler-1266 c around the hoststar Kepler-1266
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Exoplanet Name : Kepler-1266 c
Alternate Name : "KOI-2521 c, KOI-2521.02"
Status : Confirmed
Radius (Rjup / Re): 0.1499 (Rjup) 1.6802 (Rearth)
Mass (Mjup / Me): 0.0134 (Mjup) 4.2747 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0520 (AU) 0.0520 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0133
Orbital Period(Observed/Estimated) 4.87 (Days Obs.) 4.75 (Days Est.)
Surface Gravity (G Earth) 1.5142
Star Radiation at Atmospheric Boundary: 148560.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 876.2 (K)
Blackbody T 0.3(K) 822.9 (K)
Blackbody T 0.7(K) 665.8 (K)
Tidally Locked Blackbody T 0.1(K) 1042.0 (K)
Tidally Locked Blackbody T 0.3(K) 978.6 (K)
Size Class: super-Earth-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 : Kepler-1266
Alternate Name : "7183745, KOI-2521"
Star Distance(LY) : 2770.1
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 5.1 (GY)
Temperature : 5004 (K)
Spectral type : K0V
UV portion[%]: 3.3
Visible portion[%]: 37.1
IR portion[%]: 59.6
Metalicity : -0.1
Absolute Magnitude: 5.9
Apparent Magnitude: 15.6
Right Ascension(RA) 285.8693
Declination (DEC) 42.7281
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
Kepler-1266 c
Kepler-1266 c

  • Kepler-1266 c is an exoplanet orbiting the star Kepler-1266, located about 2770.1 light-years (849.3 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star Kepler-1266 has apparent magnitude of 15.6, with absolute magnitude of 5.9.
  • It is 0.8 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 5004 with its spectral types of K0V
  • In this planetary system, the extrasolar planet Kepler-1266 c orbits around the star Kepler-1266 every 4.9 days with its orbital distance of 0.05 AU ( 7779089.3 km)
  • (Projected orbit of Kepler-1266 c around its host star Kepler-1266)


  • The Star Kepler-1266 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.392 AU ( 58655785.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.542 AU ( 81077624.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.826 AU ( 123544357.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.215 AU ( 181800934.5 km)
  • Radiation at Planetary Boundary of Kepler-1266 c : 148560.59 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1266)



  • Kopparapu Recent Venus for Star Kepler-1266 distance : 0.424 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1266 distance : 0.537 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1266 distance : 0.519 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1266 distance : 0.569 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1266 distance : 0.973 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1266 distance : 1.026 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1266)



  • Original Kopparapu Recent Venus for Star Kepler-1266 distance : 0.420 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1266 distance : 0.553 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1266 distance : 0.555 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1266 distance : 0.989 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1266 distance : 1.029 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1266)



    (Position in Stellar Map of star Kepler-1266 and its Exoplanet Kepler-1266 c)



    (Zoomed position in Stellar Map of star Kepler-1266 and its Exoplanet Kepler-1266 c (zoom level 3))

    (Synthetic Spectrum of star Kepler-1266*)
    *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