Imaginary Picture of HD 4203 b

Display orbital revolution of HD 4203 b around the hoststar HD 4203
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Exoplanet Name : HD 4203 b
Alternate Name :
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 1.8200 (Mjup) 578.6472 (Mearth)
Semi Major Axis / Orbital Distance Calculated 1.1640 (AU) 1.1640 (AU Est.)
Eccentricity : 0.5200
Orbital Period(Yrs) 1.1965
Orbital Period(Observed/Estimated) 437.05 (Days Obs.) 431.50 (Days Est.)
Star Radiation at Atmospheric Boundary: 1691.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 286.2 (K)
Blackbody T 0.3(K) 268.8 (K)
Blackbody T 0.7(K) 217.5 (K)
Tidally Locked Blackbody T 0.1(K) 340.4 (K)
Tidally Locked Blackbody T 0.3(K) 319.6 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 4203
Alternate Name :
Star Distance(LY) : 257.4
Stellar Radius(Rsun) : 1.3 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 9.4 (GY)
Temperature : 5701 (K)
Spectral type : G5
Metalicity : 0.5
Absolute Magnitude: 4.2
Apparent Magnitude: 8.7
Right Ascension(RA) 11.1717
Declination (DEC) 20.4489
Hubble Space Telescope Guide Star Catalog (GSC) ID 01194-00026
Discovered by
Discovery Paper - Authors "Stephen R. Kane, Steve B. Howell, Elliott P. Horch, Ying Feng, Natalie R. Hinkel, David R. Ciardi, Mark E. Everett, Andrew W. Howard, Jason T. Wright"
Discovery Paper - Title LIMITS ON STELLAR COMPANIONS TO EXOPLANET HOST STARS WITH ECCENTRIC PLANETS
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+4203+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%204203%20b/
HD 4203 b
HD 4203 b

  • HD 4203 b is an exoplanet orbiting the star HD 4203, located about 257.4 light-years (78.9 pc) away from Solar System. Its discovery was publicly announced on 2001.
  • The host star HD 4203 has apparent magnitude of 8.7, with absolute magnitude of 4.2.
  • It is 1.1 times more massive and 1.3 times bigger compared with our Sun. The surface temperature is 5701 with its spectral types of G5
  • In this planetary system, the extrasolar planet HD 4203 b orbits around the star HD 4203 every 437.1 days with its orbital distance of 1.16 AU ( 174131921.5 km)
  • (Projected orbit of HD 4203 b around its host star HD 4203)


  • The Star HD 4203 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.936 AU ( 140091516.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.294 AU ( 193643085.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.972 AU ( 295069209.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.902 AU ( 434207267.6 km)
  • Radiation at Planetary Boundary of HD 4203 b : 1691.24 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 4203)



  • Kopparapu Recent Venus for Star HD 4203 distance : 0.975 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 4203 distance : 1.235 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 4203 distance : 1.193 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 4203 distance : 1.308 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 4203 distance : 2.185 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 4203 distance : 2.305 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 4203)



  • Original Kopparapu Recent Venus for Star HD 4203 distance : 0.975 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 4203 distance : 1.269 AU
  • Original Kopparapu Moist Greenhouse for Star HD 4203 distance : 1.290 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 4203 distance : 2.223 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 4203 distance : 2.312 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 4203)



    (Position in Stellar Map of star HD 4203 and its Exoplanet HD 4203 b)



    (Zoomed position in Stellar Map of star HD 4203 and its Exoplanet HD 4203 b (zoom level 3))