HR 8799
Imaginary Picture of Star HR 8799
Star Name : HR 8799
Alternate Name : HD 218396
Star Distance (LY/pc): 128.5055 (LY) 39.4000 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 1.5000 (Rsun, estimated)
Stellar Mass (Msun): 1.5600 (Msun/observed) 1.5600 (Msun/estimated)
Spectral type : A5V
Metalicity : -0.4700
Absolute Magnitude : 2.98
Apparent Magnitude : 5.96
Right Ascension(RA) : 346.87083
Declination(DEC) : 21.13417
  • This is the HR 8799 . The star HR 8799 islocated about 128.5 light-years (39.4 pc) away from our Solar System.
  • The star HR 8799 has apparent magnitude of 6.0, with absolute magnitude of 3.0.
  • It is 1.6 times more massive and 1.5 times bigger compared with our Sun. The surface temperature is 8310 with its spectral types of A5V
  • Number of Extrasolar Planets : 4
  • Name of the 1 Planet HR 8799 b radius 1.200000 mass 7.000000 orbital distance 68.000000
  • Name of the 2 Planet HR 8799 c radius 1.300000 mass 10.000000 orbital distance 42.900000
  • Name of the 3 Planet HR 8799 d radius 1.200000 mass 10.000000 orbital distance 27.000000
  • Name of the 4 Planet HR 8799 e radius 0.907830 mass 9.000000 orbital distance 14.500000
    (Illustration of the HR 8799's Planetary System)



    The Star HR 8799 's habitable zone is located at the following distance

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 2.244 AU ( 335700060.2 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 3.102 AU ( 464025212.1 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 4.726 AU ( 707071734.6 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 6.955 AU ( 1040487032.3 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HR 8799)



    Kopparapu's Recent Venus for Star HR 8799 distance : 2.120 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star HR 8799 distance : 2.686 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star HR 8799 distance : 2.594 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star HR 8799 distance : 2.823 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star HR 8799 distance : 4.634 AU
    Kopparapu's Outer Boundary for Early Mars for Star HR 8799 distance : 4.886 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HR 8799)



  • Original Kopparapu Recent Venus for Star HR 8799 distance : 2.201 AU
  • Original Kopparapu Runaway Greenhouse for Star HR 8799 distance : 2.739 AU
  • Original Kopparapu Moist Greenhouse for Star HR 8799 distance : 2.913 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HR 8799 distance : 4.714 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HR 8799 distance : 4.902 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HR 8799)



    (Position in Stellar Map of star HR 8799 )



    (Zoomed position in Stellar Map of star HR 8799 (zoom level 3))