TOI-257
Imaginary Picture of Star TOI-257
Star Name : TOI-257
Alternate Name : HD 19916
Star Distance (LY/pc): 251.3684 (LY) 77.0700 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 1.9260 (Rsun, estimated)
Stellar Mass (Msun): 1.3890 (Msun/observed) 1.3890 (Msun/estimated)
Spectral type : F8/G0V
Metalicity : 0.1900
Absolute Magnitude : 17.57
Apparent Magnitude : 22.00
Right Ascension(RA) : 47.51667
Declination(DEC) : -50.83250
  • This is the TOI-257 . The star TOI-257 islocated about 251.4 light-years (77.1 pc) away from our Solar System.
  • The star TOI-257 has apparent magnitude of 22.0, with absolute magnitude of 17.6.
  • It is 1.4 times more massive and 1.9 times bigger compared with our Sun. The surface temperature is 6075 with its spectral types of F8/G0V
  • Number of Extrasolar Planets : 1
  • Name of the 1 Planet TOI-257 b radius 0.626000 mass 0.134000 orbital distance 0.152300
    (Illustration of the TOI-257's Planetary System)



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

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.540 AU ( 230359941.6 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 2.128 AU ( 318417639.6 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 3.243 AU ( 485198017.0 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.773 AU ( 713990137.2 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star TOI-257)



    Kopparapu's Recent Venus for Star TOI-257 distance : 1.567 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star TOI-257 distance : 1.985 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star TOI-257 distance : 1.917 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star TOI-257 distance : 2.101 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star TOI-257 distance : 3.480 AU
    Kopparapu's Outer Boundary for Early Mars for Star TOI-257 distance : 3.671 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star TOI-257)



  • Original Kopparapu Recent Venus for Star TOI-257 distance : 1.579 AU
  • Original Kopparapu Runaway Greenhouse for Star TOI-257 distance : 2.038 AU
  • Original Kopparapu Moist Greenhouse for Star TOI-257 distance : 2.090 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-257 distance : 3.542 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star TOI-257 distance : 3.684 AU

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



    (Position in Stellar Map of star TOI-257 )



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