K2-257

Display orbital revolution around the star K2-257
Imaginary Picture of Star K2-257
Star Name : K2-257
Alternate Name : "2MASS J12330683-0157113, EPIC 228974324, WISE J123306.80-015711.7"
Star Distance (LY/pc): 211.3162 (LY) 64.7899 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 0.5000 (Rsun, estimated)
Stellar Mass (Msun): 0.5200 (Msun/observed) 0.5200 (Msun/estimated)
Spectral type : M2
Metalicity : -0.0300
Absolute Magnitude : 6.42
Apparent Magnitude : 10.48
Right Ascension(RA) : 188.27849
Declination(DEC) : -1.95316
  • This is the K2-257 . The star K2-257 islocated about 211.3 light-years (64.8 pc) away from our Solar System.
  • The star K2-257 has apparent magnitude of 10.5, with absolute magnitude of 6.4.
  • It is 0.5 times more massive and 0.5 times bigger compared with our Sun. The surface temperature is 3725 with its spectral types of M2
  • Number of Extrasolar Planets : 1
  • Name of the 1 Planet K2-257 b radius 0.074000 mass 0.001584 orbital distance 0.021600
    (Illustration of the K2-257's Planetary System)



    The Star K2-257 's habitable zone is located at the following distance

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.150 AU ( 22484367.3 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.208 AU ( 31079271.5 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.317 AU ( 47357931.9 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.466 AU ( 69689271.4 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-257)



    Kopparapu's Recent Venus for Star K2-257 distance : 0.169 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star K2-257 distance : 0.214 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star K2-257 distance : 0.207 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star K2-257 distance : 0.226 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star K2-257 distance : 0.412 AU
    Kopparapu's Outer Boundary for Early Mars for Star K2-257 distance : 0.435 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-257)



  • Original Kopparapu Recent Venus for Star K2-257 distance : 0.168 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-257 distance : 0.222 AU
  • Original Kopparapu Moist Greenhouse for Star K2-257 distance : 0.222 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-257 distance : 0.419 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-257 distance : 0.435 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-257)



    (Position in Stellar Map of star K2-257 )



    (Zoomed position in Stellar Map of star K2-257 (zoom level 3))

    (Synthetic Spectrum of star Kepler-1044*)
    *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