Imaginary Picture of HD 205521 b

Display orbital revolution of HD 205521 b around the hoststar HD 205521
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Exoplanet Name : HD 205521 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 26.6200 (Mjup) 8463.5096 (Mearth)
Semi Major Axis / Orbital Distance Calculated 3.2600 (AU) 3.2600 (AU Est.)
Eccentricity : 0.1700
Orbital Period(Yrs) 5.5640
Orbital Period(Observed/Estimated) 2032.32 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 81.7349
Star Radiation at Atmospheric Boundary: 93.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 138.9 (K)
Blackbody T 0.3(K) 130.5 (K)
Blackbody T 0.7(K) 105.6 (K)
Tidally Locked Blackbody T 0.1(K) 165.2 (K)
Tidally Locked Blackbody T 0.3(K) 155.2 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 205521
Alternate Name :
Star Distance(LY) : 155.7
Stellar Radius(Rsun) : 0.9 (Rsun Estimated)
Stellar Mass(Msun) : 0.0 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5660 (K)
Spectral type : G5
UV portion[%]: 7.5
Visible portion[%]: 44.2
IR portion[%]: 48.3
Metalicity : 0.0
Absolute Magnitude: 4.6
Apparent Magnitude: 8.0
Right Ascension(RA) 321.7458
Declination (DEC) 1.7425
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK
Open Exoplanet Database Link
HD 205521 b
HD 205521 b

  • HD 205521 b is an exoplanet orbiting the star HD 205521, located about 155.7 light-years (47.7 pc) away from Solar System. Its discovery was publicly announced on 2021.
  • The host star HD 205521 has apparent magnitude of 8.0, with absolute magnitude of 4.6.
  • In this planetary system, the extrasolar planet HD 205521 b orbits around the star HD 205521 every 2032.3 days with its orbital distance of 3.26 AU ( 487689058.5 km)
  • (Projected orbit of HD 205521 b around its host star HD 205521)


  • The Star HD 205521 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.618 AU ( 92443124.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.854 AU ( 127780556.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.302 AU ( 194709290.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.915 AU ( 286523251.1 km)
  • Radiation at Planetary Boundary of HD 205521 b : 93.89 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 205521)



  • Kopparapu Recent Venus for Star HD 205521 distance : 0.645 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 205521 distance : 0.817 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 205521 distance : 0.789 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 205521 distance : 0.865 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 205521 distance : 1.447 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 205521 distance : 1.526 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 205521)



  • Original Kopparapu Recent Venus for Star HD 205521 distance : 0.644 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 205521 distance : 0.840 AU
  • Original Kopparapu Moist Greenhouse for Star HD 205521 distance : 0.853 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 205521 distance : 1.472 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 205521 distance : 1.531 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 205521)



    (Position in Stellar Map of star HD 205521 and its Exoplanet HD 205521 b)



    (Zoomed position in Stellar Map of star HD 205521 and its Exoplanet HD 205521 b (zoom level 3))

    (Synthetic Spectrum of star HD 205521*)
    *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