Imaginary Picture of HD 31527 d
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Exoplanet Name : HD 31527 d
Alternate Name :
Radius (Rjup / Re): 0.2206 (Rjup) 2.4723 (Rearth)
Mass (Mjup / Me): 0.0519 (Mjup) 16.5010 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.8181 (AU) 0.8181 (AU Est.)
Eccentricity : 0.6700
Orbital Period(Yrs) 0.7507
Orbital Period(Observed/Estimated) 274.20 (Days Obs.) 0.00 (Days Est.)
Star Radiation at Atmospheric Boundary: 2450.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 314.0 (K)
Blackbody T 0.3(K) 294.9 (K)
Blackbody T 0.7(K) 238.6 (K)
Tidally Locked Blackbody T 0.1(K) 373.4 (K)
Tidally Locked Blackbody T 0.3(K) 350.7 (K)
Size Class: sub-Neptune-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 31527
Alternate Name :
Star Distance(LY) : 125.3
Stellar Radius(Rsun) : 1.0 (Rsun Estimated)
Stellar Mass(Msun) : 0.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 6050 (K)
Spectral type : G0V
Metalicity : 0.0
Absolute Magnitude: 4.6
Apparent Magnitude: 7.5
Right Ascension(RA) 73.9083
Declination (DEC) -23.2419
Hubble Space Telescope Guide Star Catalog (GSC) ID 06466-00479
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+31527+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%2031527%20d/
HD 31527 d
HD 31527 d

  • HD 31527 d is an exoplanet orbiting the star HD 31527, located about 125.3 light-years (38.4 pc) away from Solar System. Its discovery was publicly announced on 2011.
  • The host star HD 31527 has apparent magnitude of 7.5, with absolute magnitude of 4.6.
  • In this planetary system, the extrasolar planet HD 31527 d orbits around the star HD 31527 every 274.2 days with its orbital distance of 0.82 AU ( 122386018.0 km)
  • (Projected orbit of HD 31527 d around its host star HD 31527)


  • The Star HD 31527 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.792 AU ( 118523320.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.095 AU ( 163830203.0 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.669 AU ( 249640973.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.456 AU ( 367357629.0 km)
  • Radiation at Planetary Boundary of HD 31527 d : 2450.66 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 31527)



  • Kopparapu Recent Venus for Star HD 31527 distance : 0.808 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 31527 distance : 1.023 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 31527 distance : 0.988 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 31527 distance : 1.083 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 31527 distance : 1.794 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 31527 distance : 1.893 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 31527)



  • Original Kopparapu Recent Venus for Star HD 31527 distance : 0.813 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 31527 distance : 1.050 AU
  • Original Kopparapu Moist Greenhouse for Star HD 31527 distance : 1.076 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 31527 distance : 1.826 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 31527 distance : 1.899 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 31527)



    (Position in Stellar Map of star HD 31527 and its Exoplanet HD 31527 d)



    (Zoomed position in Stellar Map of star HD 31527 and its Exoplanet HD 31527 d (zoom level 3))