Imaginary Picture of HATS-18 b
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Exoplanet Name : HATS-18 b
Alternate Name :
Radius (Rjup / Re): 1.3370 (Rjup) 14.9864 (Rearth)
Mass (Mjup / Me): 1.9800 (Mjup) 629.5172 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0176 (AU) 0.0176 (AU Est.)
Eccentricity : 0.1660
Orbital Period(Yrs) 0.0023
Orbital Period(Observed/Estimated) 0.84 (Days Obs.) 0.84 (Days Est.)
Star Radiation at Atmospheric Boundary: 4046118.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 2001.7 (K)
Blackbody T 0.3(K) 1879.8 (K)
Blackbody T 0.7(K) 1521.0 (K)
Tidally Locked Blackbody T 0.1(K) 2380.5 (K)
Tidally Locked Blackbody T 0.3(K) 2235.5 (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 : HATS-18
Alternate Name :
Star Distance(LY) : 2103.7
Stellar Radius(Rsun) : 1.0 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 4.2 (GY)
Temperature : 5600 (K)
Spectral type : G
Metalicity : 0.3
Absolute Magnitude: 5.0
Apparent Magnitude: 14.0
Right Ascension(RA) 173.9574
Declination (DEC) -29.1561
Hubble Space Telescope Guide Star Catalog (GSC) ID 06664-00410
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HATS-18+&submit=SIMBAD+search
Open Exoplanet Database Link
HATS-18 b
HATS-18 b

  • HATS-18 b is an exoplanet orbiting the star HATS-18, located about 2103.7 light-years (645.0 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star HATS-18 has apparent magnitude of 14.0, with absolute magnitude of 5.0.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5600 with its spectral types of G
  • In this planetary system, the extrasolar planet HATS-18 b orbits around the star HATS-18 every 0.8 days with its orbital distance of 0.02 AU ( 2634418.5 km)
  • (Projected orbit of HATS-18 b around its host star HATS-18)


  • The Star HATS-18 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.693 AU ( 103665521.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.958 AU ( 143292842.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.460 AU ( 218346580.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.148 AU ( 321306559.0 km)
  • Radiation at Planetary Boundary of HATS-18 b : 4046118.05 W/m2

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



  • Kopparapu Recent Venus for Star HATS-18 distance : 0.726 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HATS-18 distance : 0.919 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HATS-18 distance : 0.888 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HATS-18 distance : 0.973 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HATS-18 distance : 1.631 AU
  • Kopparapu Outer Boundary for Early Mars for Star HATS-18 distance : 1.721 AU

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



  • Original Kopparapu Recent Venus for Star HATS-18 distance : 0.724 AU
  • Original Kopparapu Runaway Greenhouse for Star HATS-18 distance : 0.945 AU
  • Original Kopparapu Moist Greenhouse for Star HATS-18 distance : 0.958 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HATS-18 distance : 1.660 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HATS-18 distance : 1.726 AU

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



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



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