Imaginary Picture of Kepler-57 b
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Exoplanet Name : Kepler-57 b
Alternate Name : KOI-1270 b
Radius (Rjup / Re): 0.1677 (Rjup) 1.8797 (Rearth)
Mass (Mjup / Me): 0.0728 (Mjup) 23.1395 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0601 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0157
Orbital Period(Observed/Estimated) 5.73 (Days Obs.) 0.00 (Days Est.)
Star Radiation at Atmospheric Boundary: 169125.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 905.1 (K)
Blackbody T 0.3(K) 850.0 (K)
Blackbody T 0.7(K) 687.7 (K)
Tidally Locked Blackbody T 0.1(K) 1076.3 (K)
Tidally Locked Blackbody T 0.3(K) 1010.8 (K)
Size Class: super-Earth-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : TTV
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : Kepler-57
Alternate Name : "2MASS 19343390+4439253, KIC 8564587, KOI-1270"
Star Distance(LY) : 2100.1
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5203 (K)
Spectral type : K0
Metalicity : -0.0
Absolute Magnitude: 6.5
Apparent Magnitude: 15.5
Right Ascension(RA) 293.6413
Declination (DEC) 44.6569
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Jason H. Ste_en, Daniel C. Fabrycky, Eric Agol, Eric B. Ford, Robert C. Morehead, William D. Cochran, Jack J. Lissauer, Elisabeth R. Adams, William J. Borucki, Steve Bryson, Douglas A. Caldwell, Andrea Dupree, Jon M. Jenkins, Paul Robertson, Jason F. Rowe, Shawn Seader, Susan Thompson, and Joseph D. Twicken"
Discovery Paper - Title Transit Timing Observations from Kepler: VII. Con_rmation of 27 planets in 13 multiplanet systems via Transit Timing Variations and orbital stability
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-57+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-57%20b/
Kepler-57 b
Kepler-57 b

  • Kepler-57 b is an exoplanet orbiting the star Kepler-57, located about 2100.1 light-years (643.9 pc) away from Solar System. Its discovery was publicly announced on 2012.
  • The host star Kepler-57 has apparent magnitude of 15.5, with absolute magnitude of 6.5.
  • It is 0.9 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5203 with its spectral types of K0
  • In this planetary system, the extrasolar planet Kepler-57 b orbits around the star Kepler-57 every 5.7 days with its orbital distance of 0.06 AU ( 8996730.6 km)
  • (Projected orbit of Kepler-57 b around its host star Kepler-57)


  • The Star Kepler-57 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.484 AU ( 72380189.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.669 AU ( 100048336.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.019 AU ( 152451524.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.500 AU ( 224339096.1 km)
  • Radiation at Planetary Boundary of Kepler-57 b : 169125.62 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-57)



  • Kopparapu Recent Venus for Star Kepler-57 distance : 0.518 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-57 distance : 0.656 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-57 distance : 0.634 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-57 distance : 0.695 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-57 distance : 1.180 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-57 distance : 1.244 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-57)



  • Original Kopparapu Recent Venus for Star Kepler-57 distance : 0.514 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-57 distance : 0.676 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-57 distance : 0.680 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-57 distance : 1.200 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-57 distance : 1.248 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-57)



    (Position in Stellar Map of star Kepler-57 and its Exoplanet Kepler-57 b)



    (Zoomed position in Stellar Map of star Kepler-57 and its Exoplanet Kepler-57 b (zoom level 3))