Imaginary Picture of HD 73256 b

Display orbital revolution of HD 73256 b around the hoststar HD 73256
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Exoplanet Name : HD 73256 b
Alternate Name :
Status : Controversial
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 1.8700 (Mjup) 594.5441 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0370 (AU) 0.0370 (AU Est.)
Eccentricity : 0.0290
Orbital Period(Yrs) 0.0070
Orbital Period(Observed/Estimated) 2.55 (Days Obs.) 2.54 (Days Est.)
Surface Gravity (G Earth) 5.7417
Star Radiation at Atmospheric Boundary: 682970.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1283.0 (K)
Blackbody T 0.3(K) 1204.9 (K)
Blackbody T 0.7(K) 974.9 (K)
Tidally Locked Blackbody T 0.1(K) 1525.8 (K)
Tidally Locked Blackbody T 0.3(K) 1432.9 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 73256
Alternate Name :
Star Distance(LY) : 117.0
Stellar Radius(Rsun) : 0.9 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.8 (GY)
Temperature : 5570 (K)
Spectral type : G8/K0
UV portion[%]: 7.2
Visible portion[%]: 43.7
IR portion[%]: 49.1
Metalicity : 0.3
Absolute Magnitude: 5.3
Apparent Magnitude: 8.1
Right Ascension(RA) 129.0959
Declination (DEC) -30.0375
Hubble Space Telescope Guide Star Catalog (GSC) ID 7136-02007
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+73256+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%2073256%20b/
HD 73256 b
HD 73256 b

  • HD 73256 b is an exoplanet orbiting the star HD 73256, located about 117.0 light-years (35.9 pc) away from Solar System. Its discovery was publicly announced on 2003.
  • The host star HD 73256 has apparent magnitude of 8.1, with absolute magnitude of 5.3.
  • It is 1.1 times more massive and 0.9 times bigger compared with our Sun. The surface temperature is 5570 with its spectral types of G8/K0
  • In this planetary system, the extrasolar planet HD 73256 b orbits around the star HD 73256 every 2.5 days with its orbital distance of 0.04 AU ( 5535121.2 km)
  • (Projected orbit of HD 73256 b around its host star HD 73256)


  • The Star HD 73256 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.598 AU ( 89486703.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.827 AU ( 123694009.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.260 AU ( 188482297.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.854 AU ( 277359957.6 km)
  • Radiation at Planetary Boundary of HD 73256 b : 682970.83 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 73256)



  • Kopparapu Recent Venus for Star HD 73256 distance : 0.628 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 73256 distance : 0.795 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 73256 distance : 0.768 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 73256 distance : 0.842 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 73256 distance : 1.412 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 73256 distance : 1.489 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 73256)



  • Original Kopparapu Recent Venus for Star HD 73256 distance : 0.626 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 73256 distance : 0.817 AU
  • Original Kopparapu Moist Greenhouse for Star HD 73256 distance : 0.828 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 73256 distance : 1.436 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 73256 distance : 1.494 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 73256)



    (Position in Stellar Map of star HD 73256 and its Exoplanet HD 73256 b)



    (Zoomed position in Stellar Map of star HD 73256 and its Exoplanet HD 73256 b (zoom level 3))

    (Synthetic Spectrum of star HD 73256*)
    *Yamashiki YA et al. 2019 ApJ 881 114
    MUSCLES Paper I - France et al. 2016 ApJ 820 89
    MUSCLES Paper II- Youngblood et al. 2016 ApJ 824 101
    MUSCLES Paper III- Loyd et al. 2016 ApJ 824 102