Kepler-18
Imaginary Picture of Star Kepler-18
Star Name : Kepler-18
Alternate Name :
Star Distance (LY/pc): 0.0000 (LY) 0.0000 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 1.1080 (Rsun, estimated)
Stellar Mass (Msun): 0.9720 (Msun/observed) 0.9720 (Msun/estimated)
Spectral type : G7
Metalicity : 0.2000
Absolute Magnitude : 25.00
Apparent Magnitude : 14.00
Right Ascension(RA) : 298.07917
Declination(DEC) : 44.74639
  • The star Kepler-18 has apparent magnitude of 14.0, with absolute magnitude of 25.0.
  • It is 1.0 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5383 with its spectral types of G7
  • Number of Extrasolar Planets : 3
  • Name of the 1 Planet Kepler-18 b radius 0.178000 mass 0.022000 orbital distance 0.044700
  • Name of the 2 Planet Kepler-18 c radius 0.490000 mass 0.054000 orbital distance 0.075200
  • Name of the 3 Planet Kepler-18 d radius 0.623000 mass 0.052000 orbital distance 0.117200
    (Illustration of the Kepler-18's Planetary System)



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

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.696 AU ( 104051089.6 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.961 AU ( 143825797.7 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.465 AU ( 219158687.0 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.156 AU ( 322501608.7 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-18)



    Kopparapu's Recent Venus for Star Kepler-18 distance : 0.738 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star Kepler-18 distance : 0.934 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-18 distance : 0.902 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star Kepler-18 distance : 0.989 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star Kepler-18 distance : 1.669 AU
    Kopparapu's Outer Boundary for Early Mars for Star Kepler-18 distance : 1.761 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-18)



  • Original Kopparapu Recent Venus for Star Kepler-18 distance : 0.733 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-18 distance : 0.961 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-18 distance : 0.970 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-18 distance : 1.698 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-18 distance : 1.766 AU

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



    (Position in Stellar Map of star Kepler-18 )



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