Imaginary Picture of Kepler-668 b

Display orbital revolution of Kepler-668 b around the hoststar Kepler-668
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Exoplanet Name : Kepler-668 b
Alternate Name : "2MASS J19015982+4916384 b, K00765.01, KIC 11391957 b, KOI-765 b, KOI-765.01, WISE J190159.82+491638.2 b"
Radius (Rjup / Re): 0.2410 (Rjup) 2.7014 (Rearth)
Mass (Mjup / Me): 0.0209 (Mjup) 6.6479 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0769 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0229
Orbital Period(Observed/Estimated) 8.35 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 0.9110
Star Radiation at Atmospheric Boundary: 105725.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 804.8 (K)
Blackbody T 0.3(K) 755.8 (K)
Blackbody T 0.7(K) 611.5 (K)
Tidally Locked Blackbody T 0.1(K) 957.1 (K)
Tidally Locked Blackbody T 0.3(K) 898.8 (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-668
Alternate Name : "2MASS J19015982+4916384, KIC 11391957, KOI-765, WISE J190159.82+491638.2"
Star Distance(LY) : 2559.6
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 3.9 (GY)
Temperature : 5593 (K)
Spectral type : G7
UV portion[%]: 6.1
Visible portion[%]: 42.0
IR portion[%]: 51.9
Metalicity : -0.1
Absolute Magnitude: 4.5
Apparent Magnitude: 14.0
Right Ascension(RA) 285.4993
Declination (DEC) 49.2773
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Timothy D. Morton, Stephen T. Bryson, Jeffrey L. Coughlin, Jason F. Rowe, Ganesh Ravichandran, Erik A. Petigura, Michael R. Haas, and Natalie M. Batalha"
Discovery Paper - Title FALSE POSITIVE PROBABILITIES FOR ALL KEPLER OBJECTS OF INTEREST: 1284 NEWLY VALIDATED PLANETS AND 574 LIKELY FALSE POSITIVES
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-668%20b/
Kepler-668 b
Kepler-668 b

  • Kepler-668 b is an exoplanet orbiting the star Kepler-668, located about 2559.6 light-years (784.8 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star Kepler-668 has apparent magnitude of 14.0, with absolute magnitude of 4.5.
  • It is 0.9 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 5593 with its spectral types of G7
  • In this planetary system, the extrasolar planet Kepler-668 b orbits around the star Kepler-668 every 8.4 days with its orbital distance of 0.08 AU ( 11507069.9 km)
  • (Projected orbit of Kepler-668 b around its host star Kepler-668)


  • The Star Kepler-668 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.489 AU ( 73195595.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.676 AU ( 101175441.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.031 AU ( 154168982.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.517 AU ( 226866411.5 km)
  • Radiation at Planetary Boundary of Kepler-668 b : 105725.51 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-668)



  • Kopparapu Recent Venus for Star Kepler-668 distance : 0.513 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-668 distance : 0.649 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-668 distance : 0.627 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-668 distance : 0.688 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-668 distance : 1.153 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-668 distance : 1.216 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-668)



  • Original Kopparapu Recent Venus for Star Kepler-668 distance : 0.512 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-668 distance : 0.668 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-668 distance : 0.677 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-668 distance : 1.173 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-668 distance : 1.219 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-668)



    (Position in Stellar Map of star Kepler-668 and its Exoplanet Kepler-668 b)



    (Zoomed position in Stellar Map of star Kepler-668 and its Exoplanet Kepler-668 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-668*)
    *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