Imaginary Picture of HD 128356 b
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Exoplanet Name : HD 128356 b
Alternate Name :
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 0.8900 (Mjup) 282.9648 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.8700 (AU) 0.8700 (AU Est.)
Eccentricity : 0.5700
Orbital Period(Yrs) 0.8164
Orbital Period(Observed/Estimated) 298.20 (Days Obs.) 367.63 (Days Est.)
Star Radiation at Atmospheric Boundary: 661.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 226.3 (K)
Blackbody T 0.3(K) 212.5 (K)
Blackbody T 0.7(K) 172.0 (K)
Tidally Locked Blackbody T 0.1(K) 269.1 (K)
Tidally Locked Blackbody T 0.3(K) 252.7 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 128356
Alternate Name :
Star Distance(LY) : 85.7
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.7 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 10.0 (GY)
Temperature : 4875 (K)
Spectral type : K3V
Metalicity : 0.2
Absolute Magnitude: 6.2
Apparent Magnitude: 8.3
Right Ascension(RA) 219.2704
Declination (DEC) -25.8025
Hubble Space Telescope Guide Star Catalog (GSC) ID 06749-00785
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title 0
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+128356+&submit=SIMBAD+search
Open Exoplanet Database Link 0
HD 128356 b
HD 128356 b

  • HD 128356 b is an exoplanet orbiting the star HD 128356, located about 85.7 light-years (26.3 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star HD 128356 has apparent magnitude of 8.3, with absolute magnitude of 6.2.
  • It is 0.7 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 4875 with its spectral types of K3V
  • In this planetary system, the extrasolar planet HD 128356 b orbits around the star HD 128356 every 298.2 days with its orbital distance of 0.87 AU ( 130150147.5 km)
  • (Projected orbit of HD 128356 b around its host star HD 128356)


  • The Star HD 128356 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.438 AU ( 65467578.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.605 AU ( 90493302.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.922 AU ( 137891766.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.356 AU ( 202913775.3 km)
  • Radiation at Planetary Boundary of HD 128356 b : 661.15 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 128356)



  • Kopparapu Recent Venus for Star HD 128356 distance : 0.476 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 128356 distance : 0.603 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 128356 distance : 0.582 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 128356 distance : 0.639 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 128356 distance : 1.098 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 128356 distance : 1.158 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 128356)



  • Original Kopparapu Recent Venus for Star HD 128356 distance : 0.471 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 128356 distance : 0.622 AU
  • Original Kopparapu Moist Greenhouse for Star HD 128356 distance : 0.623 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 128356 distance : 1.117 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 128356 distance : 1.161 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 128356)



    (Position in Stellar Map of star HD 128356 and its Exoplanet HD 128356 b)



    (Zoomed position in Stellar Map of star HD 128356 and its Exoplanet HD 128356 b (zoom level 3))