K2-138

Display orbital revolution around the star K2-138
Imaginary Picture of Star K2-138
Star Name : K2-138
Alternate Name : "EPIC 245950175, 2MASS J23154776-1050590"
Star Distance (LY/pc): 596.8655 (LY) 183.0000 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 0.8600 (Rsun, estimated)
Stellar Mass (Msun): 0.9300 (Msun/observed) 0.9300 (Msun/estimated)
Spectral type : K1V
Metalicity : 0.1600
Absolute Magnitude : 5.90
Apparent Magnitude : 12.21
Right Ascension(RA) : 348.94904
Declination(DEC) : -10.84970
  • This is the K2-138 . The star K2-138 islocated about 596.9 light-years (183.0 pc) away from our Solar System.
  • The star K2-138 has apparent magnitude of 12.2, with absolute magnitude of 5.9.
  • It is 0.9 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5378 with its spectral types of K1V
  • Number of Extrasolar Planets : 6
  • Name of the 1 Planet K2-138 b radius 0.140000 mass 0.009800 orbital distance 0.033800
  • Name of the 2 Planet K2-138 c radius 0.225000 mass 0.019800 orbital distance 0.044540
  • Name of the 3 Planet K2-138 d radius 0.237000 mass 0.024900 orbital distance 0.058830
  • Name of the 4 Planet K2-138 e radius 0.294000 mass 0.040900 orbital distance 0.078070
  • Name of the 5 Planet K2-138 f radius 0.251000 mass 0.005000 orbital distance 0.104300
  • Name of the 6 Planet K2-138 g radius 0.268800 mass 0.013500 orbital distance 0.231000
    (Illustration of the K2-138's Planetary System)



    The Star K2-138 's habitable zone is located at the following distance

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.539 AU ( 80611714.8 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.745 AU ( 111426456.2 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.135 AU ( 169789260.6 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.670 AU ( 249852334.9 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-138)



    Kopparapu's Recent Venus for Star K2-138 distance : 0.572 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star K2-138 distance : 0.724 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star K2-138 distance : 0.699 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star K2-138 distance : 0.767 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star K2-138 distance : 1.294 AU
    Kopparapu's Outer Boundary for Early Mars for Star K2-138 distance : 1.365 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-138)



  • Original Kopparapu Recent Venus for Star K2-138 distance : 0.568 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-138 distance : 0.745 AU
  • Original Kopparapu Moist Greenhouse for Star K2-138 distance : 0.752 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-138 distance : 1.316 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-138 distance : 1.369 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-138)



    (Position in Stellar Map of star K2-138 )



    (Zoomed position in Stellar Map of star K2-138 (zoom level 3))

    (Synthetic Spectrum of star Kepler-938*)
    *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