Imaginary Picture of HAT-P-31 b
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Exoplanet Name : HAT-P-31 b
Alternate Name :
Radius (Rjup / Re): 1.0700 (Rjup) 11.9936 (Rearth)
Mass (Mjup / Me): 2.1710 (Mjup) 690.2434 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0550 (AU) 0.0550 (AU Est.)
Eccentricity : 0.2450
Orbital Period(Yrs) 0.0137
Orbital Period(Observed/Estimated) 5.01 (Days Obs.) 4.27 (Days Est.)
Star Radiation at Atmospheric Boundary: 1014566.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1416.5 (K)
Blackbody T 0.3(K) 1330.2 (K)
Blackbody T 0.7(K) 1076.3 (K)
Tidally Locked Blackbody T 0.1(K) 1684.5 (K)
Tidally Locked Blackbody T 0.3(K) 1581.9 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HAT-P-31
Alternate Name :
Star Distance(LY) : 1058.9
Stellar Radius(Rsun) : 1.4 (Rsun Measured)
Stellar Mass(Msun) : 1.2 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 3.2 (GY)
Temperature : 6065 (K)
Spectral type : G0
Metalicity : 0.1
Absolute Magnitude: 4.1
Apparent Magnitude: 11.7
Right Ascension(RA) 271.5377
Declination (DEC) 26.4267
Hubble Space Telescope Guide Star Catalog (GSC) ID 02099-00908
Discovered by
Discovery Paper - Authors HOG E.; FABRICIUS C.; MAKAROV V.V.; URBAN S.; CORBIN T.; WYCOFF G.; BASTIAN U.; SCHWEKENDIEK P.; WICENEC A.
Discovery Paper - Title The Tycho-2 catalogue of the 2.5 million brightest stars.
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HAT-P-31+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HAT-P-31%20b/
HAT-P-31 b
HAT-P-31 b

  • HAT-P-31 b is an exoplanet orbiting the star HAT-P-31, located about 1058.9 light-years (324.7 pc) away from Solar System. Its discovery was publicly announced on 2011.
  • The host star HAT-P-31 has apparent magnitude of 11.7, with absolute magnitude of 4.1.
  • It is 1.2 times more massive and 1.4 times bigger compared with our Sun. The surface temperature is 6065 with its spectral types of G0
  • In this planetary system, the extrasolar planet HAT-P-31 b orbits around the star HAT-P-31 every 5.0 days with its orbital distance of 0.06 AU ( 8227882.9 km)
  • (Projected orbit of HAT-P-31 b around its host star HAT-P-31)


  • The Star HAT-P-31 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.084 AU ( 162128226.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.498 AU ( 224103577.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.283 AU ( 341484258.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.359 AU ( 502509045.9 km)
  • Radiation at Planetary Boundary of HAT-P-31 b : 1014566.39 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HAT-P-31)



  • Kopparapu Recent Venus for Star HAT-P-31 distance : 1.104 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HAT-P-31 distance : 1.398 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HAT-P-31 distance : 1.350 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HAT-P-31 distance : 1.480 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-31 distance : 2.451 AU
  • Kopparapu Outer Boundary for Early Mars for Star HAT-P-31 distance : 2.586 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HAT-P-31)



  • Original Kopparapu Recent Venus for Star HAT-P-31 distance : 1.112 AU
  • Original Kopparapu Runaway Greenhouse for Star HAT-P-31 distance : 1.435 AU
  • Original Kopparapu Moist Greenhouse for Star HAT-P-31 distance : 1.471 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-31 distance : 2.495 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HAT-P-31 distance : 2.595 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HAT-P-31)



    (Position in Stellar Map of star HAT-P-31 and its Exoplanet HAT-P-31 b)



    (Zoomed position in Stellar Map of star HAT-P-31 and its Exoplanet HAT-P-31 b (zoom level 3))