Imaginary Picture of HD 209458 b
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Exoplanet Name : HD 209458 b
Alternate Name :
Radius (Rjup / Re): 1.3800 (Rjup) 15.4684 (Rearth)
Mass (Mjup / Me): 0.6900 (Mjup) 219.3772 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0475 (AU) 0.0475 (AU Est.)
Eccentricity : 0.0082
Orbital Period(Yrs) 0.0096
Orbital Period(Observed/Estimated) 3.52 (Days Obs.) 3.53 (Days Est.)
Star Radiation at Atmospheric Boundary: 1084768.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1440.4 (K)
Blackbody T 0.3(K) 1352.7 (K)
Blackbody T 0.7(K) 1094.5 (K)
Tidally Locked Blackbody T 0.1(K) 1712.9 (K)
Tidally Locked Blackbody T 0.3(K) 1608.6 (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 : HD 209458
Alternate Name :
Star Distance(LY) : 153.3
Stellar Radius(Rsun) : 1.2 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 4.0 (GY)
Temperature : 6092 (K)
Spectral type : G0 V
Metalicity : 0.0
Absolute Magnitude: 4.3
Apparent Magnitude: 7.7
Right Ascension(RA) 330.7949
Declination (DEC) 18.8844
Hubble Space Telescope Guide Star Catalog (GSC) ID 01688-01821
Discovered by
Discovery Paper - Authors "David Charbonneau , Timothy M. Brown , David W. Latham , and Michel Mayor "
Discovery Paper - Title Detection of Planetary Transits Across a Sun-like Star
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+209458&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%20209458%20b/
HD 209458 b
HD 209458 b

  • HD 209458 b is an exoplanet orbiting the star HD 209458, located about 153.3 light-years (47.0 pc) away from Solar System. Its discovery was publicly announced on 1999.
  • The host star HD 209458 has apparent magnitude of 7.7, with absolute magnitude of 4.3.
  • It is 1.1 times more massive and 1.2 times bigger compared with our Sun. The surface temperature is 6092 with its spectral types of G0 V
  • In this planetary system, the extrasolar planet HD 209458 b orbits around the star HD 209458 every 3.5 days with its orbital distance of 0.05 AU ( 7101410.9 km)
  • (Projected orbit of HD 209458 b around its host star HD 209458)


  • The Star HD 209458 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.967 AU ( 144691670.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.337 AU ( 200001700.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.037 AU ( 304758331.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.998 AU ( 448465234.8 km)
  • Radiation at Planetary Boundary of HD 209458 b : 1084768.79 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 209458)



  • Kopparapu Recent Venus for Star HD 209458 distance : 0.984 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 209458 distance : 1.246 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 209458 distance : 1.203 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 209458 distance : 1.318 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 209458 distance : 2.183 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 209458 distance : 2.302 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 209458)



  • Original Kopparapu Recent Venus for Star HD 209458 distance : 0.991 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 209458 distance : 1.279 AU
  • Original Kopparapu Moist Greenhouse for Star HD 209458 distance : 1.312 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 209458 distance : 2.222 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 209458 distance : 2.311 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 209458)



    (Position in Stellar Map of star HD 209458 and its Exoplanet HD 209458 b)



    (Zoomed position in Stellar Map of star HD 209458 and its Exoplanet HD 209458 b (zoom level 3))