Imaginary Picture of HD 221420 b

Display orbital revolution of HD 221420 b around the hoststar HD 221420
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Exoplanet Name : HD 221420 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 22.9000 (Mjup) 7280.7802 (Mearth)
Semi Major Axis / Orbital Distance Calculated 10.1500 (AU) 10.1500 (AU Est.)
Eccentricity : 0.1400
Orbital Period(Yrs) 27.6187
Orbital Period(Observed/Estimated) 10088.00 (Days Obs.) 9139.68 (Days Est.)
Surface Gravity (G Earth) 70.3129
Star Radiation at Atmospheric Boundary: 26.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 101.3 (K)
Blackbody T 0.3(K) 95.2 (K)
Blackbody T 0.7(K) 77.0 (K)
Tidally Locked Blackbody T 0.1(K) 120.5 (K)
Tidally Locked Blackbody T 0.3(K) 113.2 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Astrometry
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 221420
Alternate Name :
Star Distance(LY) : 103.7
Stellar Radius(Rsun) : 1.4 (Rsun Estimated)
Stellar Mass(Msun) : 1.7 (Msun Measured) 1.4 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5830 (K)
Spectral type : G2IV-V
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.3
Absolute Magnitude: 3.3
Apparent Magnitude: 5.8
Right Ascension(RA) 353.3333
Declination (DEC) -77.3853
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 221420 b
HD 221420 b

  • HD 221420 b is an exoplanet orbiting the star HD 221420, located about 103.7 light-years (31.8 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star HD 221420 has apparent magnitude of 5.8, with absolute magnitude of 3.3.
  • It is 1.7 times more massive and 1.4 times bigger compared with our Sun. The surface temperature is 5830 with its spectral types of G2IV-V
  • In this planetary system, the extrasolar planet HD 221420 b orbits around the star HD 221420 every 10088.0 days with its orbital distance of 10.15 AU ( 1518418387.6 km)
  • (Projected orbit of HD 221420 b around its host star HD 221420)


  • The Star HD 221420 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.024 AU ( 153157313.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.415 AU ( 211703432.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.156 AU ( 322589181.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.173 AU ( 474704111.6 km)
  • Radiation at Planetary Boundary of HD 221420 b : 26.58 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 221420)



  • Kopparapu Recent Venus for Star HD 221420 distance : 1.058 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 221420 distance : 1.340 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 221420 distance : 1.294 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 221420 distance : 1.418 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 221420 distance : 2.362 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 221420 distance : 2.492 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 221420)



  • Original Kopparapu Recent Venus for Star HD 221420 distance : 1.060 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 221420 distance : 1.376 AU
  • Original Kopparapu Moist Greenhouse for Star HD 221420 distance : 1.403 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 221420 distance : 2.404 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 221420 distance : 2.500 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 221420)



    (Position in Stellar Map of star HD 221420 and its Exoplanet HD 221420 b)



    (Zoomed position in Stellar Map of star HD 221420 and its Exoplanet HD 221420 b (zoom level 3))

    (Synthetic Spectrum of star HD 221420*)
    *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