HD 21520

Display orbital revolution around the star HD 21520
Imaginary Picture of Star HD 21520
Star Name : HD 21520
Alternate Name : TOI-4320
Star Distance (LY/pc): 257.6632 (LY) 79.0000 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 1.0440 (Rsun, estimated)
Stellar Mass (Msun): 1.0900 (Msun/observed) 1.0900 (Msun/estimated)
Spectral type : G1V
Metalicity : 0.0490
Absolute Magnitude : 4.71
Apparent Magnitude : 9.20
Right Ascension(RA) : 51.64036
Declination(DEC) : -43.61357
  • This is the HD 21520 . The star HD 21520 islocated about 257.7 light-years (79.0 pc) away from our Solar System.
  • The star HD 21520 has apparent magnitude of 9.2, with absolute magnitude of 4.7.
  • It is 1.1 times more massive and 1.0 times bigger compared with our Sun. The surface temperature is 5871 with its spectral types of G1V
  • Number of Extrasolar Planets : 1
  • Name of the 1 Planet HD 21520 b radius 0.240610 mass 0.024900 orbital distance 0.172600
    (Illustration of the HD 21520's Planetary System)



    The Star HD 21520 's habitable zone is located at the following distance

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.780 AU ( 116622614.1 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.078 AU ( 161202929.8 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.642 AU ( 245637590.9 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.416 AU ( 361466475.7 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 21520)



    Kopparapu's Recent Venus for Star HD 21520 distance : 0.803 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star HD 21520 distance : 1.017 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star HD 21520 distance : 0.983 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star HD 21520 distance : 1.077 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star HD 21520 distance : 1.792 AU
    Kopparapu's Outer Boundary for Early Mars for Star HD 21520 distance : 1.891 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 21520)



  • Original Kopparapu Recent Venus for Star HD 21520 distance : 0.806 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 21520 distance : 1.045 AU
  • Original Kopparapu Moist Greenhouse for Star HD 21520 distance : 1.066 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 21520 distance : 1.824 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 21520 distance : 1.897 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 21520)



    (Position in Stellar Map of star HD 21520 )



    (Zoomed position in Stellar Map of star HD 21520 (zoom level 3))

    (Synthetic Spectrum of star HATS-48A*)
    *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