Imaginary Picture of HD 221585 b

Display orbital revolution of HD 221585 b around the hoststar HD 221585
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Exoplanet Name : HD 221585 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 1.6100 (Mjup) 511.8802 (Mearth)
Semi Major Axis / Orbital Distance Calculated 2.3060 (AU) 2.3060 (AU Est.)
Eccentricity : 0.1230
Orbital Period(Yrs) 3.2114
Orbital Period(Observed/Estimated) 1173.00 (Days Obs.) 1172.48 (Days Est.)
Surface Gravity (G Earth) 4.9434
Star Radiation at Atmospheric Boundary: 292.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 184.6 (K)
Blackbody T 0.3(K) 173.4 (K)
Blackbody T 0.7(K) 140.3 (K)
Tidally Locked Blackbody T 0.1(K) 219.6 (K)
Tidally Locked Blackbody T 0.3(K) 206.2 (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 221585
Alternate Name :
Star Distance(LY) : 181.2
Stellar Radius(Rsun) : 1.1 (Rsun Estimated)
Stellar Mass(Msun) : 1.2 (Msun Measured) 1.2 (Msun Estimated)
Star Age : 6.2 (GY)
Temperature : 5620 (K)
Spectral type : G8IV
UV portion[%]: 7.3
Visible portion[%]: 44.0
IR portion[%]: 48.7
Metalicity : 0.3
Absolute Magnitude: 3.8
Apparent Magnitude: 7.5
Right Ascension(RA) 353.2252
Declination (DEC) 63.1555
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title 0
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+221585+&submit=SIMBAD+search
Open Exoplanet Database Link 0
HD 221585 b
HD 221585 b

  • HD 221585 b is an exoplanet orbiting the star HD 221585, located about 181.2 light-years (55.6 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star HD 221585 has apparent magnitude of 7.5, with absolute magnitude of 3.8.
  • It is 1.2 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5620 with its spectral types of G8IV
  • In this planetary system, the extrasolar planet HD 221585 b orbits around the star HD 221585 every 1173.0 days with its orbital distance of 2.31 AU ( 344972689.8 km)
  • (Projected orbit of HD 221585 b around its host star HD 221585)


  • The Star HD 221585 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.772 AU ( 115498273.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.067 AU ( 159648796.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.626 AU ( 243269436.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.393 AU ( 357981632.3 km)
  • Radiation at Planetary Boundary of HD 221585 b : 292.90 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 221585)



  • Kopparapu Recent Venus for Star HD 221585 distance : 0.808 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 221585 distance : 1.023 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 221585 distance : 0.988 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 221585 distance : 1.083 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 221585 distance : 1.814 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 221585 distance : 1.914 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 221585)



  • Original Kopparapu Recent Venus for Star HD 221585 distance : 0.806 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 221585 distance : 1.052 AU
  • Original Kopparapu Moist Greenhouse for Star HD 221585 distance : 1.067 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 221585 distance : 1.846 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 221585 distance : 1.920 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 221585)



    (Position in Stellar Map of star HD 221585 and its Exoplanet HD 221585 b)



    (Zoomed position in Stellar Map of star HD 221585 and its Exoplanet HD 221585 b (zoom level 3))

    (Synthetic Spectrum of star HD 221585*)
    *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