Kepler-257
Imaginary Picture of Star Kepler-257
Star Name : Kepler-257
Alternate Name :
Star Distance (LY/pc): 0.0000 (LY) 0.0000 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 1.0400 (Rsun, estimated)
Stellar Mass (Msun): 0.0000 (Msun/observed) 0.9024 (Msun/estimated)
Spectral type : K0
Metalicity : 0.3150
Absolute Magnitude : 25.00
Apparent Magnitude : 13.92
Right Ascension(RA) : 297.31598
Declination(DEC) : 46.02327
  • The star Kepler-257 has apparent magnitude of 13.9, with absolute magnitude of 25.0.
  • Number of Extrasolar Planets : 3
  • Name of the 1 Planet Kepler-257 b radius 0.233000 mass 0.020263 orbital distance 0.034000
  • Name of the 2 Planet Kepler-257 c radius 0.483000 mass 0.110451 orbital distance 0.066000
  • Name of the 3 Planet Kepler-257 d radius 0.442000 mass 0.084644 orbital distance 0.160000
    (Illustration of the Kepler-257's Planetary System)



    The Star Kepler-257 's habitable zone is located at the following distance

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.605 AU ( 90438004.5 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.836 AU ( 125008956.5 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.273 AU ( 190485985.3 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.874 AU ( 280308472.1 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-257)



    Kopparapu's Recent Venus for Star Kepler-257 distance : 0.648 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star Kepler-257 distance : 0.821 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-257 distance : 0.793 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star Kepler-257 distance : 0.869 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star Kepler-257 distance : 1.477 AU
    Kopparapu's Outer Boundary for Early Mars for Star Kepler-257 distance : 1.558 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-257)



  • Original Kopparapu Recent Venus for Star Kepler-257 distance : 0.643 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-257 distance : 0.845 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-257 distance : 0.850 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-257 distance : 1.502 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-257 distance : 1.562 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-257)



    (Position in Stellar Map of star Kepler-257 )



    (Zoomed position in Stellar Map of star Kepler-257 (zoom level 3))