Imaginary Picture of HD 125390 b
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Exoplanet Name : HD 125390 b
Alternate Name :
Radius (Rjup / Re): 1.0800 (Rjup) 12.1057 (Rearth)
Mass (Mjup / Me): 22.1600 (Mjup) 7045.5061 (Mearth)
Semi Major Axis / Orbital Distance Calculated 1.5500 (AU) 1.5500 (AU Est.)
Eccentricity : 0.5910
Orbital Period(Yrs) 4.8081
Orbital Period(Observed/Estimated) 1756.20 (Days Obs.) 604.39 (Days Est.)
Star Radiation at Atmospheric Boundary: 10751.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 454.5 (K)
Blackbody T 0.3(K) 426.8 (K)
Blackbody T 0.7(K) 345.3 (K)
Tidally Locked Blackbody T 0.1(K) 540.5 (K)
Tidally Locked Blackbody T 0.3(K) 507.6 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection : Theoretical
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 125390
Alternate Name :
Star Distance(LY) : 503.3
Stellar Radius(Rsun) : 6.2 (Rsun Measured)
Stellar Mass(Msun) : 1.4 (Msun Measured) 0.2 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4850 (K)
Spectral type : G7III
Metalicity : 0.0
Absolute Magnitude: 2.3
Apparent Magnitude: 8.2
Right Ascension(RA) 214.5388
Declination (DEC) 38.9670
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
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SIMBAD LINK
Open Exoplanet Database Link
HD 125390 b
HD 125390 b

  • HD 125390 b is an exoplanet orbiting the star HD 125390, located about 503.3 light-years (154.3 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star HD 125390 has apparent magnitude of 8.2, with absolute magnitude of 2.3.
  • It is 1.4 times more massive and 6.2 times bigger compared with our Sun. The surface temperature is 4850 with its spectral types of G7III
  • In this planetary system, the extrasolar planet HD 125390 b orbits around the star HD 125390 every 1756.2 days with its orbital distance of 1.55 AU ( 231876699.6 km)
  • (Projected orbit of HD 125390 b around its host star HD 125390)


  • The Star HD 125390 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 3.144 AU ( 470356070.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 4.346 AU ( 650155008.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 6.622 AU ( 990692354.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 9.745 AU ( 1457847198.3 km)
  • Radiation at Planetary Boundary of HD 125390 b : 10751.74 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 125390)



  • Kopparapu Recent Venus for Star HD 125390 distance : 3.425 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 125390 distance : 4.336 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 125390 distance : 4.188 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 125390 distance : 4.597 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 125390 distance : 7.907 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 125390 distance : 8.341 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 125390)



  • Original Kopparapu Recent Venus for Star HD 125390 distance : 3.384 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 125390 distance : 4.471 AU
  • Original Kopparapu Moist Greenhouse for Star HD 125390 distance : 4.478 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 125390 distance : 8.039 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 125390 distance : 8.360 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 125390)



    (Position in Stellar Map of star HD 125390 and its Exoplanet HD 125390 b)



    (Zoomed position in Stellar Map of star HD 125390 and its Exoplanet HD 125390 b (zoom level 3))