Kepler-1257

Display orbital revolution around the star Kepler-1257
Imaginary Picture of Star Kepler-1257
Star Name : Kepler-1257
Alternate Name : "2MASS J19441816+4537374, KIC 9229657, KOI-2491, WISE J194418.15+453737.2"
Star Distance (LY/pc): 3525.7464 (LY) 1081.0000 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 0.8700 (Rsun, estimated)
Stellar Mass (Msun): 0.9000 (Msun/observed) 0.9000 (Msun/estimated)
Spectral type : G7
Metalicity : -0.0900
Absolute Magnitude : 4.12
Apparent Magnitude : 14.29
Right Ascension(RA) : 296.07568
Declination(DEC) : 45.62706
  • This is the Kepler-1257 . The star Kepler-1257 islocated about 3525.7 light-years (1081.0 pc) away from our Solar System.
  • The star Kepler-1257 has apparent magnitude of 14.3, with absolute magnitude of 4.1.
  • It is 0.9 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5502 with its spectral types of G7
  • Number of Extrasolar Planets : 1
  • Name of the 1 Planet Kepler-1257 b radius 0.136000 mass 0.014205 orbital distance 0.000000
    (Illustration of the Kepler-1257's Planetary System)



    The Star Kepler-1257 's habitable zone is located at the following distance

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.571 AU ( 85352950.2 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.789 AU ( 117980082.6 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.202 AU ( 179775537.0 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.768 AU ( 264547578.1 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-1257)



    Kopparapu's Recent Venus for Star Kepler-1257 distance : 0.601 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star Kepler-1257 distance : 0.761 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-1257 distance : 0.735 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star Kepler-1257 distance : 0.806 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star Kepler-1257 distance : 1.355 AU
    Kopparapu's Outer Boundary for Early Mars for Star Kepler-1257 distance : 1.429 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-1257)



  • Original Kopparapu Recent Venus for Star Kepler-1257 distance : 0.599 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-1257 distance : 0.783 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-1257 distance : 0.792 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-1257 distance : 1.378 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-1257 distance : 1.433 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-1257)



    (Position in Stellar Map of star Kepler-1257 )



    (Zoomed position in Stellar Map of star Kepler-1257 (zoom level 3))

    (Synthetic Spectrum of star Kepler-342*)
    *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