K2-18
Imaginary Picture of Star K2-18
Star Name : K2-18
Alternate Name : EPIC 201912552
Star Distance (LY/pc): 110.8930 (LY) 34.0000 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 0.3940 (Rsun, estimated)
Stellar Mass (Msun): 0.4130 (Msun/observed) 0.4130 (Msun/estimated)
Spectral type : M4
Metalicity : 0.0900
Absolute Magnitude : 19.34
Apparent Magnitude : 22.00
Right Ascension(RA) : 172.56046
Declination(DEC) : 7.58839
  • This is the K2-18 . The star K2-18 islocated about 110.9 light-years (34.0 pc) away from our Solar System.
  • The star K2-18 has apparent magnitude of 22.0, with absolute magnitude of 19.3.
  • It is 0.4 times more massive and 0.4 times bigger compared with our Sun. The surface temperature is 3503 with its spectral types of M4
  • Number of Extrasolar Planets : 2
  • Name of the 1 Planet K2-18 b radius 0.211400 mass 0.028070 orbital distance 0.142900
  • Name of the 2 Planet K2-18 c radius 0.151133 mass 0.023600 orbital distance 0.060000
    (Illustration of the K2-18's Planetary System)



    The Star K2-18 's habitable zone is located at the following distance

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.105 AU ( 15668759.3 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.145 AU ( 21658320.1 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.221 AU ( 33002486.8 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.325 AU ( 48564605.1 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-18)



    Kopparapu's Recent Venus for Star K2-18 distance : 0.347 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star K2-18 distance : 0.439 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star K2-18 distance : 0.424 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star K2-18 distance : 0.463 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star K2-18 distance : 0.853 AU
    Kopparapu's Outer Boundary for Early Mars for Star K2-18 distance : 0.901 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-18)



  • Original Kopparapu Recent Venus for Star K2-18 distance : 0.344 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-18 distance : 0.454 AU
  • Original Kopparapu Moist Greenhouse for Star K2-18 distance : 0.455 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-18 distance : 0.867 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-18 distance : 0.902 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-18)



    (Position in Stellar Map of star K2-18 )



    (Zoomed position in Stellar Map of star K2-18 (zoom level 3))