HD 20781

Display orbital revolution around the star HD 20781
Imaginary Picture of Star HD 20781
Star Name : HD 20781
Alternate Name :
Star Distance (LY/pc): inf (LY) inf (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 1.1036 (Rsun, estimated)
Stellar Mass (Msun): 0.0000 (Msun/observed) 0.6982 (Msun/estimated)
Spectral type : G9.5V
Metalicity : 0.0000
Absolute Magnitude : -inf
Apparent Magnitude : 8.44
Right Ascension(RA) : 50.01250
Declination(DEC) : -28.78389
  • This is the HD 20781 . The star HD 20781 islocated about inf light-years ( inf pc) away from our Solar System.
  • The star HD 20781 has apparent magnitude of 8.4, with absolute magnitude of -inf.
  • Number of Extrasolar Planets : 4
  • Name of the 1 Planet HD 20781 b radius 0.106573 mass 0.006070 orbital distance 0.052900
  • Name of the 2 Planet HD 20781 c radius 0.138605 mass 0.016770 orbital distance 0.100000
  • Name of the 3 Planet HD 20781 d radius 0.199300 mass 0.033400 orbital distance 0.164700
  • Name of the 4 Planet HD 20781 e radius 0.212565 mass 0.044200 orbital distance 0.337400
    (Illustration of the HD 20781's Planetary System)



    The Star HD 20781 's habitable zone is located at the following distance

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.723 AU ( 108196493.8 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.000 AU ( 149555829.6 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.523 AU ( 227889987.7 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.242 AU ( 335350100.1 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 20781)



    Kopparapu's Recent Venus for Star HD 20781 distance : 0.762 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star HD 20781 distance : 0.965 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star HD 20781 distance : 0.932 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star HD 20781 distance : 1.022 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star HD 20781 distance : 1.718 AU
    Kopparapu's Outer Boundary for Early Mars for Star HD 20781 distance : 1.812 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 20781)



  • Original Kopparapu Recent Venus for Star HD 20781 distance : 0.759 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 20781 distance : 0.992 AU
  • Original Kopparapu Moist Greenhouse for Star HD 20781 distance : 1.004 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 20781 distance : 1.747 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 20781 distance : 1.817 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 20781)



    (Position in Stellar Map of star HD 20781 )



    (Zoomed position in Stellar Map of star HD 20781 (zoom level 3))

    (Synthetic Spectrum of star HATS-42*)
    *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