Imaginary Picture of HD 118203 b
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Exoplanet Name : HD 118203 b
Alternate Name :
Radius (Rjup / Re): 1.1330 (Rjup) 12.6998 (Rearth)
Mass (Mjup / Me): 2.1730 (Mjup) 690.8793 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0708 (AU) 0.0708 (AU Est.)
Eccentricity : 0.3160
Orbital Period(Yrs) 0.0168
Orbital Period(Observed/Estimated) 6.13 (Days Obs.) 6.21 (Days Est.)
Star Radiation at Atmospheric Boundary: 320989.0 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1062.3 (K)
Blackbody T 0.3(K) 997.7 (K)
Blackbody T 0.7(K) 807.2 (K)
Tidally Locked Blackbody T 0.1(K) 1263.3 (K)
Tidally Locked Blackbody T 0.3(K) 1186.4 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Spectrum
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 118203
Alternate Name :
Star Distance(LY) : 297.0
Stellar Radius(Rsun) : 1.2 (Rsun Estimated)
Stellar Mass(Msun) : 1.2 (Msun Measured) 1.3 (Msun Estimated)
Star Age : 4.6 (GY)
Temperature : 5600 (K)
Spectral type : K0
Metalicity : 0.1
Absolute Magnitude: 3.3
Apparent Magnitude: 8.1
Right Ascension(RA) 203.5106
Declination (DEC) 53.7283
Hubble Space Telescope Guide Star Catalog (GSC) ID 03850-00458
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+118203+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%20118203%20b/
HD 118203 b
HD 118203 b

  • HD 118203 b is an exoplanet orbiting the star HD 118203, located about 297.0 light-years (91.1 pc) away from Solar System. Its discovery was publicly announced on 2005.
  • The host star HD 118203 has apparent magnitude of 8.1, with absolute magnitude of 3.3.
  • It is 1.2 times more massive and 1.2 times bigger compared with our Sun. The surface temperature is 5600 with its spectral types of K0
  • In this planetary system, the extrasolar planet HD 118203 b orbits around the star HD 118203 every 6.1 days with its orbital distance of 0.07 AU ( 10594521.2 km)
  • (Projected orbit of HD 118203 b around its host star HD 118203)


  • The Star HD 118203 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.785 AU ( 117423961.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.085 AU ( 162310602.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.653 AU ( 247325438.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.433 AU ( 363950216.8 km)
  • Radiation at Planetary Boundary of HD 118203 b : 320989.04 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 118203)



  • Kopparapu Recent Venus for Star HD 118203 distance : 0.822 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 118203 distance : 1.041 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 118203 distance : 1.006 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 118203 distance : 1.103 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 118203 distance : 1.848 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 118203 distance : 1.949 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 118203)



  • Original Kopparapu Recent Venus for Star HD 118203 distance : 0.820 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 118203 distance : 1.071 AU
  • Original Kopparapu Moist Greenhouse for Star HD 118203 distance : 1.086 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 118203 distance : 1.880 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 118203 distance : 1.955 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 118203)



    (Position in Stellar Map of star HD 118203 and its Exoplanet HD 118203 b)



    (Zoomed position in Stellar Map of star HD 118203 and its Exoplanet HD 118203 b (zoom level 3))