Imaginary Picture of HAT-P-11 b
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Exoplanet Name : HAT-P-11 b
Alternate Name :
Radius (Rjup / Re): 0.3890 (Rjup) 4.3603 (Rearth)
Mass (Mjup / Me): 0.0736 (Mjup) 23.4002 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0530 (AU) 0.0530 (AU Est.)
Eccentricity : 0.2650
Orbital Period(Yrs) 0.0134
Orbital Period(Observed/Estimated) 4.89 (Days Obs.) 4.95 (Days Est.)
Star Radiation at Atmospheric Boundary: 137451.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 859.4 (K)
Blackbody T 0.3(K) 807.0 (K)
Blackbody T 0.7(K) 653.0 (K)
Tidally Locked Blackbody T 0.1(K) 1022.0 (K)
Tidally Locked Blackbody T 0.3(K) 959.7 (K)
Size Class: Neptune-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-11
Alternate Name :
Star Distance(LY) : 123.3
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 6.5 (GY)
Temperature : 4864 (K)
Spectral type : K4
Metalicity : 0.3
Absolute Magnitude: 6.7
Apparent Magnitude: 9.6
Right Ascension(RA) 297.7094
Declination (DEC) 48.0808
Hubble Space Telescope Guide Star Catalog (GSC) ID 03561-02092
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HAT-P-11+&submit=SIMBAD+search
Open Exoplanet Database Link
HAT-P-11 b
HAT-P-11 b

  • HAT-P-11 b is an exoplanet orbiting the star HAT-P-11, located about 123.3 light-years (37.8 pc) away from Solar System. Its discovery was publicly announced on 2009.
  • The host star HAT-P-11 has apparent magnitude of 9.6, with absolute magnitude of 6.7.
  • It is 0.8 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 4864 with its spectral types of K4
  • In this planetary system, the extrasolar planet HAT-P-11 b orbits around the star HAT-P-11 every 4.9 days with its orbital distance of 0.05 AU ( 7928687.1 km)
  • (Projected orbit of HAT-P-11 b around its host star HAT-P-11)


  • The Star HAT-P-11 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.384 AU ( 57505119.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.531 AU ( 79487102.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.810 AU ( 121120754.0 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.191 AU ( 178234495.5 km)
  • Radiation at Planetary Boundary of HAT-P-11 b : 137451.62 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HAT-P-11)



  • Kopparapu Recent Venus for Star HAT-P-11 distance : 0.418 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HAT-P-11 distance : 0.530 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HAT-P-11 distance : 0.512 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HAT-P-11 distance : 0.562 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-11 distance : 0.966 AU
  • Kopparapu Outer Boundary for Early Mars for Star HAT-P-11 distance : 1.019 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HAT-P-11)



  • Original Kopparapu Recent Venus for Star HAT-P-11 distance : 0.414 AU
  • Original Kopparapu Runaway Greenhouse for Star HAT-P-11 distance : 0.546 AU
  • Original Kopparapu Moist Greenhouse for Star HAT-P-11 distance : 0.547 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HAT-P-11 distance : 0.982 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HAT-P-11 distance : 1.021 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HAT-P-11)



    (Position in Stellar Map of star HAT-P-11 and its Exoplanet HAT-P-11 b)



    (Zoomed position in Stellar Map of star HAT-P-11 and its Exoplanet HAT-P-11 b (zoom level 3))