HD 81817

Display orbital revolution around the star HD 81817
Imaginary Picture of Star HD 81817
Star Name : HD 81817
Alternate Name :
Star Distance (LY/pc): 994.3780 (LY) 304.8780 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 83.8000 (Rsun, estimated)
Stellar Mass (Msun): 4.3000 (Msun/observed) 4.3000 (Msun/estimated)
Spectral type : K6
Metalicity : -0.1700
Absolute Magnitude : -3.02
Apparent Magnitude : 4.40
Right Ascension(RA) : 144.27203
Declination(DEC) : 81.30972
  • This is the HD 81817 . The star HD 81817 islocated about 994.4 light-years (304.9 pc) away from our Solar System.
  • The star HD 81817 has apparent magnitude of 4.4, with absolute magnitude of -3.0.
  • It is 4.3 times more massive and 83.8 times bigger compared with our Sun. The surface temperature is 4140 with its spectral types of K6
  • Number of Extrasolar Planets : 1
  • Name of the 1 Planet HD 81817 b radius 1.049861 mass 27.100000 orbital distance 3.300000
    (Illustration of the HD 81817's Planetary System)



    The Star HD 81817 's habitable zone is located at the following distance

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 31.116 AU ( 4654819160.6 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 43.010 AU ( 6434176529.6 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 65.537 AU ( 9804261150.9 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 96.441 AU ( 14427399780.7 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 81817)



    Kopparapu's Recent Venus for Star HD 81817 distance : 34.743 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star HD 81817 distance : 43.976 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star HD 81817 distance : 42.473 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star HD 81817 distance : 46.528 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star HD 81817 distance : 82.878 AU
    Kopparapu's Outer Boundary for Early Mars for Star HD 81817 distance : 87.431 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 81817)



  • Original Kopparapu Recent Venus for Star HD 81817 distance : 34.297 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 81817 distance : 45.454 AU
  • Original Kopparapu Moist Greenhouse for Star HD 81817 distance : 45.381 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 81817 distance : 84.210 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 81817 distance : 87.576 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 81817)



    (Position in Stellar Map of star HD 81817 )



    (Zoomed position in Stellar Map of star HD 81817 (zoom level 3))

    (Synthetic Spectrum of star HD 20794*)
    *Yamashiki YA et al. 2019 ApJ 881 114
    MUSCLES Paper I - France et al. 2016 ApJ 820 89
    MUSCLES Paper II- Youngblood et al. 2016 ApJ 824 101
    MUSCLES Paper III- Loyd et al. 2016 ApJ 824 102