KOI-1257

Display orbital revolution around the star KOI-1257
Imaginary Picture of Star KOI-1257
Star Name : KOI-1257
Alternate Name : "KOI-1257, 2MASS J19245404+4455385, KIC 8751933, KOI-1257 A, Kepler-420, WISE J192454.01+445538.5"
Star Distance (LY/pc): 2935.4040 (LY) 900.0000 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 1.1300 (Rsun, estimated)
Stellar Mass (Msun): 0.9900 (Msun/observed) 0.9900 (Msun/estimated)
Spectral type : G5 V
Metalicity : 0.2700
Absolute Magnitude : 3.45
Apparent Magnitude : 13.22
Right Ascension(RA) : 291.22518
Declination(DEC) : 44.92738
  • This is the KOI-1257 . The star KOI-1257 islocated about 2935.4 light-years (900.0 pc) away from our Solar System.
  • The star KOI-1257 has apparent magnitude of 13.2, with absolute magnitude of 3.5.
  • It is 1.0 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5520 with its spectral types of G5 V
  • Number of Extrasolar Planets : 1
  • Name of the 1 Planet KOI-1257 b radius 0.940000 mass 1.450000 orbital distance 0.382000
    (Illustration of the KOI-1257's Planetary System)



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

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.746 AU ( 111587285.1 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.031 AU ( 154242789.3 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.571 AU ( 235031877.0 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.312 AU ( 345859703.0 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star KOI-1257)



    Kopparapu's Recent Venus for Star KOI-1257 distance : 0.785 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star KOI-1257 distance : 0.994 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star KOI-1257 distance : 0.960 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star KOI-1257 distance : 1.053 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star KOI-1257 distance : 1.768 AU
    Kopparapu's Outer Boundary for Early Mars for Star KOI-1257 distance : 1.865 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star KOI-1257)



  • Original Kopparapu Recent Venus for Star KOI-1257 distance : 0.782 AU
  • Original Kopparapu Runaway Greenhouse for Star KOI-1257 distance : 1.022 AU
  • Original Kopparapu Moist Greenhouse for Star KOI-1257 distance : 1.035 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star KOI-1257 distance : 1.799 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star KOI-1257 distance : 1.871 AU

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



    (Position in Stellar Map of star KOI-1257 )



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

    (Synthetic Spectrum of star HD 206893*)
    *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