K2-18

Display orbital revolution around the star K2-18
Imaginary Picture of Star K2-18
Star Name : K2-18
Alternate Name : "EPIC 201912552, 2MASS J11301450+0735180, WISE J113014.45+073516.8"
Star Distance (LY/pc): 124.2646 (LY) 38.0997 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 0.4100 (Rsun, estimated)
Stellar Mass (Msun): 0.3600 (Msun/observed) 0.3600 (Msun/estimated)
Spectral type : M2.5 V
Metalicity : 0.1200
Absolute Magnitude : 10.60
Apparent Magnitude : 13.50
Right Ascension(RA) : 172.56045
Declination(DEC) : 7.58839
  • This is the K2-18 . The star K2-18 islocated about 124.3 light-years (38.1 pc) away from our Solar System.
  • The star K2-18 has apparent magnitude of 13.5, with absolute magnitude of 10.6.
  • It is 0.4 times more massive and 0.4 times bigger compared with our Sun. The surface temperature is 3457 with its spectral types of M2.5 V
  • Number of Extrasolar Planets : 2
  • Name of the 1 Planet K2-18 b radius 0.211000 mass 0.028070 orbital distance 0.142900
  • Name of the 2 Planet K2-18 c radius 0.151181 mass 0.023630 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 ) : 0.106 AU ( 15879642.8 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.147 AU ( 21949816.2 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.224 AU ( 33446662.3 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.329 AU ( 49218228.8 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 : 0.120 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star K2-18 distance : 0.152 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star K2-18 distance : 0.147 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star K2-18 distance : 0.160 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star K2-18 distance : 0.296 AU
    Kopparapu's Outer Boundary for Early Mars for Star K2-18 distance : 0.312 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-18)



  • Original Kopparapu Recent Venus for Star K2-18 distance : 0.119 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-18 distance : 0.157 AU
  • Original Kopparapu Moist Greenhouse for Star K2-18 distance : 0.158 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-18 distance : 0.301 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-18 distance : 0.313 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))

    (Synthetic Spectrum of star Kepler-749*)
    *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