Imaginary Picture of HD 20782 b
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Exoplanet Name : HD 20782 b
Alternate Name :
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 1.9000 (Mjup) 604.0822 (Mearth)
Semi Major Axis / Orbital Distance Calculated 1.3810 (AU) 1.3810 (AU Est.)
Eccentricity : 0.9700
Orbital Period(Yrs) 1.6205
Orbital Period(Observed/Estimated) 591.90 (Days Obs.) 592.76 (Days Est.)
Star Radiation at Atmospheric Boundary: 622.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 222.9 (K)
Blackbody T 0.3(K) 209.4 (K)
Blackbody T 0.7(K) 169.4 (K)
Tidally Locked Blackbody T 0.1(K) 265.1 (K)
Tidally Locked Blackbody T 0.3(K) 249.0 (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 20782
Alternate Name :
Star Distance(LY) : 116.9
Stellar Radius(Rsun) : 1.0 (Rsun Estimated)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 7.1 (GY)
Temperature : 5578 (K)
Spectral type : G2 V
Metalicity : -0.1
Absolute Magnitude: 4.6
Apparent Magnitude: 7.4
Right Ascension(RA) 50.0149
Declination (DEC) -28.8539
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "S. Desidera, M. Barbieri"
Discovery Paper - Title Properties of planets in binary systems. The role of binary separation
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+20782+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%2020782%20b/
HD 20782 b
HD 20782 b

  • HD 20782 b is an exoplanet orbiting the star HD 20782, located about 116.9 light-years (35.9 pc) away from Solar System. Its discovery was publicly announced on 2006.
  • The host star HD 20782 has apparent magnitude of 7.4, with absolute magnitude of 4.6.
  • It is 1.0 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5578 with its spectral types of G2 V
  • In this planetary system, the extrasolar planet HD 20782 b orbits around the star HD 20782 every 591.9 days with its orbital distance of 1.38 AU ( 206594659.4 km)
  • (Projected orbit of HD 20782 b around its host star HD 20782)


  • The Star HD 20782 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.674 AU ( 100835889.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.932 AU ( 139381550.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.420 AU ( 212386637.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.089 AU ( 312536241.5 km)
  • Radiation at Planetary Boundary of HD 20782 b : 622.49 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 20782)



  • Kopparapu Recent Venus for Star HD 20782 distance : 0.707 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 20782 distance : 0.895 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 20782 distance : 0.865 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 20782 distance : 0.948 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 20782 distance : 1.590 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 20782 distance : 1.677 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 20782)



  • Original Kopparapu Recent Venus for Star HD 20782 distance : 0.705 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 20782 distance : 0.921 AU
  • Original Kopparapu Moist Greenhouse for Star HD 20782 distance : 0.933 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 20782 distance : 1.617 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 20782 distance : 1.682 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 20782)



    (Position in Stellar Map of star HD 20782 and its Exoplanet HD 20782 b)



    (Zoomed position in Stellar Map of star HD 20782 and its Exoplanet HD 20782 b (zoom level 3))