Imaginary Picture of Kepler-1657 b
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Exoplanet Name : Kepler-1657 b
Alternate Name : K03680.01
Radius (Rjup / Re): 0.9900 (Rjup) 11.0969 (Rearth)
Mass (Mjup / Me): 1.9300 (Mjup) 613.6203 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.5340 (AU) 0.5340 (AU Est.)
Eccentricity : 0.4960
Orbital Period(Yrs) 0.3867
Orbital Period(Observed/Estimated) 141.24 (Days Obs.) 141.82 (Days Est.)
Star Radiation at Atmospheric Boundary: 4887.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 373.2 (K)
Blackbody T 0.3(K) 350.5 (K)
Blackbody T 0.7(K) 283.6 (K)
Tidally Locked Blackbody T 0.1(K) 443.8 (K)
Tidally Locked Blackbody T 0.3(K) 416.8 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : Kepler-1657
Alternate Name : "2MASS J19330757+4518348, KOI-3680"
Star Distance(LY) : 3087.4
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 3.2 (GY)
Temperature : 5926 (K)
Spectral type : G1
Metalicity : 0.2
Absolute Magnitude: 4.4
Apparent Magnitude: 14.3
Right Ascension(RA) 293.2816
Declination (DEC) 45.3097
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-1657+&submit=SIMBAD+search
Open Exoplanet Database Link
Kepler-1657 b
Kepler-1657 b

  • Kepler-1657 b is an exoplanet orbiting the star Kepler-1657, located about 3087.4 light-years (946.6 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star Kepler-1657 has apparent magnitude of 14.3, with absolute magnitude of 4.4.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5926 with its spectral types of G1
  • In this planetary system, the extrasolar planet Kepler-1657 b orbits around the star Kepler-1657 every 141.2 days with its orbital distance of 0.53 AU ( 79885263.0 km)
  • (Projected orbit of Kepler-1657 b around its host star Kepler-1657)


  • The Star Kepler-1657 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.730 AU ( 109257847.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.010 AU ( 151022897.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.538 AU ( 230125474.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.264 AU ( 338639717.1 km)
  • Radiation at Planetary Boundary of Kepler-1657 b : 4887.78 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1657)



  • Kopparapu Recent Venus for Star Kepler-1657 distance : 0.750 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-1657 distance : 0.950 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1657 distance : 0.918 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-1657 distance : 1.006 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1657 distance : 1.671 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-1657 distance : 1.763 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1657)



  • Original Kopparapu Recent Venus for Star Kepler-1657 distance : 0.753 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1657 distance : 0.976 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1657 distance : 0.997 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1657 distance : 1.701 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1657 distance : 1.769 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1657)



    (Position in Stellar Map of star Kepler-1657 and its Exoplanet Kepler-1657 b)



    (Zoomed position in Stellar Map of star Kepler-1657 and its Exoplanet Kepler-1657 b (zoom level 3))