Imaginary Picture of HAT-P-8 b
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Exoplanet Name : HAT-P-8 b
Alternate Name :
Radius (Rjup / Re): 1.5000 (Rjup) 16.8135 (Rearth)
Mass (Mjup / Me): 1.3400 (Mjup) 426.0369 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0449 (AU) 0.0449 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0084
Orbital Period(Observed/Estimated) 3.08 (Days Obs.) 3.07 (Days Est.)
Star Radiation at Atmospheric Boundary: 2243846.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1727.4 (K)
Blackbody T 0.3(K) 1622.2 (K)
Blackbody T 0.7(K) 1312.5 (K)
Tidally Locked Blackbody T 0.1(K) 2054.2 (K)
Tidally Locked Blackbody T 0.3(K) 1929.1 (K)
Size Class: Super-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-8
Alternate Name :
Star Distance(LY) : 715.3
Stellar Radius(Rsun) : 1.6 (Rsun Measured)
Stellar Mass(Msun) : 1.3 (Msun Measured) 1.3 (Msun Estimated)
Star Age : 3.4 (GY)
Temperature : 6200 (K)
Spectral type : F8
Metalicity : 0.0
Absolute Magnitude: 3.5
Apparent Magnitude: 10.2
Right Ascension(RA) 343.0411
Declination (DEC) 35.4472
Hubble Space Telescope Guide Star Catalog (GSC) ID 02757-01152
Discovered by
Discovery Paper - Authors "Claire Moutou,odrigo F. Diaz,tephane Udry,Guillaume Hebrard,rancois Bouchy,Alexandre Santerne,avid Ehrenreich,uc Arnold,sabelle Boisse,avier Bonfils,avier Delfosse,nne Eggenberger,hierry Forveille,Anne-Marie Lagrange,hristophe Lovis,atrick Martinez,rancesco Pepe,hristian Perrier,Didier Queloz,uno C. Santos,amien Segransan,ominique Toublanc,ean-Pierre Troncin,ichael Vanhuysse,lfred Vidal-Madjar"
Discovery Paper - Title "Spin-orbit inclinations of the exoplanetary systems HAT-P-8, HAT-P-9, HAT-P-16 and HAT-P-23"
Discovery Paper - Journal "A&A 533, A113 (2011)DOI https://doi.org/10.1051/0004-6361/201116760"
Discovery Paper - URL https://www.aanda.org/articles/aa/full_html/2011/09/aa16760-11/aa16760-11.html
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HAT-P-8+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HAT-P-8%20b/
HAT-P-8 b
HAT-P-8 b

  • HAT-P-8 b is an exoplanet orbiting the star HAT-P-8, located about 715.3 light-years (219.3 pc) away from Solar System. Its discovery was publicly announced on 2008.
  • The host star HAT-P-8 has apparent magnitude of 10.2, with absolute magnitude of 3.5.
  • It is 1.3 times more massive and 1.6 times bigger compared with our Sun. The surface temperature is 6200 with its spectral types of F8
  • In this planetary system, the extrasolar planet HAT-P-8 b orbits around the star HAT-P-8 every 3.1 days with its orbital distance of 0.04 AU ( 6716944.4 km)
  • (Projected orbit of HAT-P-8 b around its host star HAT-P-8)


  • The Star HAT-P-8 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.316 AU ( 196833302.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.819 AU ( 272075062.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.771 AU ( 414582184.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.078 AU ( 610075846.6 km)
  • Radiation at Planetary Boundary of HAT-P-8 b : 2243846.07 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HAT-P-8)



  • Kopparapu Recent Venus for Star HAT-P-8 distance : 1.329 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HAT-P-8 distance : 1.683 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HAT-P-8 distance : 1.626 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HAT-P-8 distance : 1.782 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-8 distance : 2.944 AU
  • Kopparapu Outer Boundary for Early Mars for Star HAT-P-8 distance : 3.105 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HAT-P-8)



  • Original Kopparapu Recent Venus for Star HAT-P-8 distance : 1.343 AU
  • Original Kopparapu Runaway Greenhouse for Star HAT-P-8 distance : 1.727 AU
  • Original Kopparapu Moist Greenhouse for Star HAT-P-8 distance : 1.777 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-8 distance : 2.996 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HAT-P-8 distance : 3.116 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HAT-P-8)



    (Position in Stellar Map of star HAT-P-8 and its Exoplanet HAT-P-8 b)



    (Zoomed position in Stellar Map of star HAT-P-8 and its Exoplanet HAT-P-8 b (zoom level 3))