Imaginary Picture of Kepler-1666 b

Display orbital revolution of Kepler-1666 b around the hoststar Kepler-1666
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Exoplanet Name : Kepler-1666 b
Alternate Name : "2MASS J19514837+4615529 b, K00945.01, KIC 9605514 b, KOI-945 b, KOI-945.01"
Status : Confirmed
Radius (Rjup / Re): 0.2570 (Rjup) 2.8807 (Rearth)
Mass (Mjup / Me): 0.0222 (Mjup) 7.0575 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1761 (AU) 0.1761 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0708
Orbital Period(Observed/Estimated) 25.85 (Days Obs.) 25.92 (Days Est.)
Surface Gravity (G Earth) 0.8504
Star Radiation at Atmospheric Boundary: 66336.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 716.3 (K)
Blackbody T 0.3(K) 672.7 (K)
Blackbody T 0.7(K) 544.3 (K)
Tidally Locked Blackbody T 0.1(K) 851.8 (K)
Tidally Locked Blackbody T 0.3(K) 799.9 (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-1666
Alternate Name : "9605514, 2MASS J19514837+4615529, KIC 9605514, KOI-945"
Star Distance(LY) : 4678.4
Stellar Radius(Rsun) : 1.2 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5818 (K)
Spectral type : G2
UV portion[%]: 0.3
Visible portion[%]: 1.5
IR portion[%]: 98.2
Metalicity : -0.2
Absolute Magnitude: 4.1
Apparent Magnitude: 14.9
Right Ascension(RA) 297.9516
Declination (DEC) 46.2647
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=Kepler-1666&submit=SIMBAD+search
Open Exoplanet Database Link
Kepler-1666 b
Kepler-1666 b

  • Kepler-1666 b is an exoplanet orbiting the star Kepler-1666, located about 4678.4 light-years (1434.4 pc) away from Solar System. Its discovery was publicly announced on 2020.
  • The host star Kepler-1666 has apparent magnitude of 14.9, with absolute magnitude of 4.1.
  • It is 1.1 times more massive and 1.2 times bigger compared with our Sun. The surface temperature is 5818 with its spectral types of G2
  • In this planetary system, the extrasolar planet Kepler-1666 b orbits around the star Kepler-1666 every 25.8 days with its orbital distance of 0.18 AU ( 26344185.0 km)
  • (Projected orbit of Kepler-1666 b around its host star Kepler-1666)


  • The Star Kepler-1666 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.887 AU ( 132736669.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.226 AU ( 183476765.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.869 AU ( 279577987.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.750 AU ( 411411255.9 km)
  • Radiation at Planetary Boundary of Kepler-1666 b : 66336.37 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1666)



  • Kopparapu Recent Venus for Star Kepler-1666 distance : 0.917 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1666 distance : 1.162 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1666 distance : 1.122 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1666 distance : 1.230 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1666 distance : 2.049 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1666 distance : 2.162 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1666)



  • Original Kopparapu Recent Venus for Star Kepler-1666 distance : 0.919 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1666 distance : 1.194 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1666 distance : 1.216 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1666 distance : 2.086 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1666 distance : 2.169 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1666)



    (Position in Stellar Map of star Kepler-1666 and its Exoplanet Kepler-1666 b)



    (Zoomed position in Stellar Map of star Kepler-1666 and its Exoplanet Kepler-1666 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-1666*)
    *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