HD 22781

Display orbital revolution around the star HD 22781
Imaginary Picture of Star HD 22781
Star Name : HD 22781
Alternate Name :
Star Distance (LY/pc): 102.4681 (LY) 31.4169 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 0.6452 (Rsun, estimated)
Stellar Mass (Msun): 0.7500 (Msun/observed) 0.7500 (Msun/estimated)
Spectral type : K0V
Metalicity : -0.3700
Absolute Magnitude : 6.28
Apparent Magnitude : 8.77
Right Ascension(RA) : 55.20636
Declination(DEC) : 31.82639
  • This is the HD 22781 . The star HD 22781 islocated about 102.5 light-years (31.4 pc) away from our Solar System.
  • The star HD 22781 has apparent magnitude of 8.8, with absolute magnitude of 6.3.
  • It is 0.8 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 5027 with its spectral types of K0V
  • Number of Extrasolar Planets : 1
  • Name of the 1 Planet HD 22781 b radius 0.907830 mass 13.650000 orbital distance 1.167000
    (Illustration of the HD 22781's Planetary System)



    The Star HD 22781 's habitable zone is located at the following distance

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.353 AU ( 52842615.1 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.488 AU ( 73042303.4 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.744 AU ( 111300306.2 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.095 AU ( 163783276.3 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 22781)



    Kopparapu's Recent Venus for Star HD 22781 distance : 0.482 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star HD 22781 distance : 0.610 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star HD 22781 distance : 0.589 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star HD 22781 distance : 0.646 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star HD 22781 distance : 1.104 AU
    Kopparapu's Outer Boundary for Early Mars for Star HD 22781 distance : 1.165 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 22781)



  • Original Kopparapu Recent Venus for Star HD 22781 distance : 0.477 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 22781 distance : 0.628 AU
  • Original Kopparapu Moist Greenhouse for Star HD 22781 distance : 0.631 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 22781 distance : 1.123 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 22781 distance : 1.168 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 22781)



    (Position in Stellar Map of star HD 22781 )



    (Zoomed position in Stellar Map of star HD 22781 (zoom level 3))

    (Synthetic Spectrum of star HATS-72*)
    *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