Imaginary Picture of Kepler-1708 b-i

Display orbital revolution of Kepler-1708 b-i around the hoststar Kepler-1708
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Exoplanet Name : Kepler-1708 b-i
Alternate Name : Exomoon
Status : Confirmed
Radius (Rjup / Re): 0.2329 (Rjup) 2.6106 (Rearth)
Mass (Mjup / Me): 0.1160 (Mjup) 36.8808 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0500 (AU) 0.0500 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0126
Orbital Period(Observed/Estimated) 4.60 (Days Obs.) 3.91 (Days Est.)
Surface Gravity (G Earth) 5.4116
Star Radiation at Atmospheric Boundary: 879524.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1366.8 (K)
Blackbody T 0.3(K) 1283.6 (K)
Blackbody T 0.7(K) 1038.5 (K)
Tidally Locked Blackbody T 0.1(K) 1625.4 (K)
Tidally Locked Blackbody T 0.3(K) 1526.4 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Theoretical
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : Kepler-1708
Alternate Name :
Star Distance(LY) : 5437.0
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 3.2 (GY)
Temperature : 6157 (K)
Spectral type : G0
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.0
Absolute Magnitude: 4.9
Apparent Magnitude: 16.0
Right Ascension(RA) 296.8250
Declination (DEC) 43.6247
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.cds.unistra.fr/simbad/sim-basic?Ident=Kepler-1708&submit=SIMBAD+search
Open Exoplanet Database Link
Kepler-1708 b-i
Kepler-1708 b-i

  • Kepler-1708 b-i is an exoplanet orbiting the star Kepler-1708, located about 5437.0 light-years (1667.0 pc) away from Solar System. Its discovery was publicly announced on 2021.
  • The host star Kepler-1708 has apparent magnitude of 16.0, with absolute magnitude of 4.9.
  • It is 1.1 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 6157 with its spectral types of G0
  • In this planetary system, the extrasolar planet Kepler-1708 b-i orbits around the star Kepler-1708 every 4.6 days with its orbital distance of 0.05 AU ( 7479893.5 km)
  • (Projected orbit of Kepler-1708 b-i around its host star Kepler-1708)


  • The Star Kepler-1708 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.917 AU ( 137230167.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.268 AU ( 189687953.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.932 AU ( 289042463.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.843 AU ( 425338647.4 km)
  • Radiation at Planetary Boundary of Kepler-1708 b-i : 879524.14 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1708)



  • Kopparapu Recent Venus for Star Kepler-1708 distance : 0.929 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1708 distance : 1.177 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1708 distance : 1.136 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1708 distance : 1.245 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1708 distance : 2.059 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1708 distance : 2.172 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1708)



  • Original Kopparapu Recent Venus for Star Kepler-1708 distance : 0.938 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1708 distance : 1.208 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1708 distance : 1.241 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1708 distance : 2.096 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1708 distance : 2.180 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1708)



    (Position in Stellar Map of star Kepler-1708 and its Exoplanet Kepler-1708 b-i)



    (Zoomed position in Stellar Map of star Kepler-1708 and its Exoplanet Kepler-1708 b-i (zoom level 3))

    (Synthetic Spectrum of star Kepler-1708*)
    *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