Imaginary Picture of KELT-18 b
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Exoplanet Name : KELT-18 b
Alternate Name :
Radius (Rjup / Re): 1.5700 (Rjup) 17.5981 (Rearth)
Mass (Mjup / Me): 1.1800 (Mjup) 375.1668 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0455 (AU) 0.0455 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0079
Orbital Period(Observed/Estimated) 2.87 (Days Obs.) 2.87 (Days Est.)
Star Radiation at Atmospheric Boundary: 4268173.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 2028.6 (K)
Blackbody T 0.3(K) 1905.1 (K)
Blackbody T 0.7(K) 1541.4 (K)
Tidally Locked Blackbody T 0.1(K) 2412.5 (K)
Tidally Locked Blackbody T 0.3(K) 2265.6 (K)
Size Class: Super-Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : KELT-18
Alternate Name :
Star Distance(LY) : 1014.3
Stellar Radius(Rsun) : 1.9 (Rsun Measured)
Stellar Mass(Msun) : 1.5 (Msun Measured) 1.5 (Msun Estimated)
Star Age : 1.9 (GY)
Temperature : 6670 (K)
Spectral type : F4V
Metalicity : 0.1
Absolute Magnitude: 2.6
Apparent Magnitude: 10.1
Right Ascension(RA) 216.5250
Declination (DEC) 59.4442
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK
Open Exoplanet Database Link
KELT-18 b
KELT-18 b

  • KELT-18 b is an exoplanet orbiting the star KELT-18, located about 1014.3 light-years (311.0 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star KELT-18 has apparent magnitude of 10.1, with absolute magnitude of 2.6.
  • It is 1.5 times more massive and 1.9 times bigger compared with our Sun. The surface temperature is 6670 with its spectral types of F4V
  • In this planetary system, the extrasolar planet KELT-18 b orbits around the star KELT-18 every 2.9 days with its orbital distance of 0.05 AU ( 6806703.1 km)
  • (Projected orbit of KELT-18 b around its host star KELT-18)


  • The Star KELT-18 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.839 AU ( 275098454.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 2.542 AU ( 380257956.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 3.873 AU ( 579428974.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 5.700 AU ( 852655118.6 km)
  • Radiation at Planetary Boundary of KELT-18 b : 4268173.78 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star KELT-18)



  • Kopparapu Recent Venus for Star KELT-18 distance : 1.807 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star KELT-18 distance : 2.289 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star KELT-18 distance : 2.210 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star KELT-18 distance : 2.422 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star KELT-18 distance : 3.973 AU
  • Kopparapu Outer Boundary for Early Mars for Star KELT-18 distance : 4.190 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star KELT-18)



  • Original Kopparapu Recent Venus for Star KELT-18 distance : 1.845 AU
  • Original Kopparapu Runaway Greenhouse for Star KELT-18 distance : 2.345 AU
  • Original Kopparapu Moist Greenhouse for Star KELT-18 distance : 2.441 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star KELT-18 distance : 4.045 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star KELT-18 distance : 4.206 AU

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



    (Position in Stellar Map of star KELT-18 and its Exoplanet KELT-18 b)



    (Zoomed position in Stellar Map of star KELT-18 and its Exoplanet KELT-18 b (zoom level 3))