Imaginary Picture of HD 216520 c

Display orbital revolution of HD 216520 c around the hoststar HD 216520
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Exoplanet Name : HD 216520 c
Alternate Name : "2MASS J22473183+8341493 c, BD+82 704 c, HIP 112527 c, LSPM J2247+8341 c, SAO 3796 c, TIC 264899051 c, TYC 4650-00917-1
Radius (Rjup / Re): 0.1601 (Rjup) 1.7948 (Rearth)
Mass (Mjup / Me): 0.0297 (Mjup) 9.4428 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.5280 (AU) 0.5280 (AU Est.)
Eccentricity : 0.1200
Orbital Period(Yrs) 0.4228
Orbital Period(Observed/Estimated) 154.43 (Days Obs.) 154.75 (Days Est.)
Surface Gravity (G Earth) 2.9315
Star Radiation at Atmospheric Boundary: 1722.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 287.5 (K)
Blackbody T 0.3(K) 270.0 (K)
Blackbody T 0.7(K) 218.5 (K)
Tidally Locked Blackbody T 0.1(K) 342.0 (K)
Tidally Locked Blackbody T 0.3(K) 321.1 (K)
Size Class: super-Earth-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Habitable
Habitability by Kopparapu: Habitable
Star Name : HD 216520
Alternate Name : "2MASS J22473183+8341493, BD+82 704, HIP 112527, LSPM J2247+8341, SAO 3796, TIC 264899051, TYC 4650-00917-1, WISE J22473X
Star Distance(LY) : 63.8
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 6.0 (GY)
Temperature : 5103 (K)
Spectral type : K0 V
UV portion[%]: 4.0
Visible portion[%]: 38.5
IR portion[%]: 57.5
Metalicity : -0.2
Absolute Magnitude: 4.5
Apparent Magnitude: 6.0
Right Ascension(RA) 341.8828
Declination (DEC) 83.6970
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 216520 c
HD 216520 c

  • HD 216520 c is an exoplanet orbiting the star HD 216520, located about 63.8 light-years (19.6 pc) away from Solar System. Its discovery was publicly announced on 2020.
  • The host star HD 216520 has apparent magnitude of 6.0, with absolute magnitude of 4.5.
  • It is 0.8 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5103 with its spectral types of K0 V
  • In this planetary system, the extrasolar planet HD 216520 c orbits around the star HD 216520 every 154.4 days with its orbital distance of 0.53 AU ( 78987675.7 km)
  • (Projected orbit of HD 216520 c around its host star HD 216520)


  • The Star HD 216520 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.429 AU ( 64139097.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.593 AU ( 88656993.6 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.903 AU ( 135093638.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.329 AU ( 198796207.2 km)
  • Radiation at Planetary Boundary of HD 216520 c : 1722.93 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 216520)



  • Kopparapu Recent Venus for Star HD 216520 distance : 0.461 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 216520 distance : 0.584 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 216520 distance : 0.564 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 216520 distance : 0.619 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 216520 distance : 1.055 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 216520 distance : 1.113 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 216520)



  • Original Kopparapu Recent Venus for Star HD 216520 distance : 0.457 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 216520 distance : 0.602 AU
  • Original Kopparapu Moist Greenhouse for Star HD 216520 distance : 0.605 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 216520 distance : 1.073 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 216520 distance : 1.115 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 216520)



    (Position in Stellar Map of star HD 216520 and its Exoplanet HD 216520 c)



    (Zoomed position in Stellar Map of star HD 216520 and its Exoplanet HD 216520 c (zoom level 3))

    (Synthetic Spectrum of star HD 216520*)
    *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