Kepler-18

Display orbital revolution around the star Kepler-18
Imaginary Picture of Star Kepler-18
Star Name : Kepler-18
Alternate Name : "2MASS J19521906+4444467, GSC 03149-02089, KIC 8644288, KOI-137, WISE J195219.06+444446.6"
Star Distance (LY/pc): 1430.2267 (LY) 438.5100 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 1.1100 (Rsun, estimated)
Stellar Mass (Msun): 0.9700 (Msun/observed) 0.9700 (Msun/estimated)
Spectral type : G7
Metalicity : 0.1900
Absolute Magnitude : 5.79
Apparent Magnitude : 14.00
Right Ascension(RA) : 298.07944
Declination(DEC) : 44.74632
  • This is the Kepler-18 . The star Kepler-18 islocated about 1430.2 light-years (438.5 pc) away from our Solar System.
  • The star Kepler-18 has apparent magnitude of 14.0, with absolute magnitude of 5.8.
  • It is 1.0 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5345 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 ) : 0.687 AU ( 102772402.8 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.950 AU ( 142058318.3 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.447 AU ( 216465439.6 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.129 AU ( 318538377.2 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 : 0.730 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star Kepler-18 distance : 0.924 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-18 distance : 0.893 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star Kepler-18 distance : 0.979 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star Kepler-18 distance : 1.654 AU
    Kopparapu's Outer Boundary for Early Mars for Star Kepler-18 distance : 1.745 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-18)



  • Original Kopparapu Recent Venus for Star Kepler-18 distance : 0.725 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-18 distance : 0.951 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-18 distance : 0.960 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-18 distance : 1.683 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-18 distance : 1.750 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))

    (Synthetic Spectrum of star HD 220074*)
    *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