Imaginary Picture of HD 212771 b

Display orbital revolution of HD 212771 b around the hoststar HD 212771
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Exoplanet Name : HD 212771 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 2.3000 (Mjup) 731.2574 (Mearth)
Semi Major Axis / Orbital Distance Calculated 1.2200 (AU) 1.2200 (AU Est.)
Eccentricity : 0.1110
Orbital Period(Yrs) 1.0220
Orbital Period(Observed/Estimated) 373.30 (Days Obs.) 458.97 (Days Est.)
Surface Gravity (G Earth) 7.0620
Star Radiation at Atmospheric Boundary: 14165.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 486.9 (K)
Blackbody T 0.3(K) 457.3 (K)
Blackbody T 0.7(K) 370.0 (K)
Tidally Locked Blackbody T 0.1(K) 579.0 (K)
Tidally Locked Blackbody T 0.3(K) 543.8 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 212771
Alternate Name :
Star Distance(LY) : 364.4
Stellar Radius(Rsun) : 5.0 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.7 (Msun Estimated)
Star Age : 6.0 (GY)
Temperature : 5121 (K)
Spectral type : G8IV
UV portion[%]: 4.1
Visible portion[%]: 38.8
IR portion[%]: 57.1
Metalicity : -0.2
Absolute Magnitude: 2.4
Apparent Magnitude: 7.6
Right Ascension(RA) 336.7628
Declination (DEC) -17.2636
Hubble Space Telescope Guide Star Catalog (GSC) ID 06385-00788
Discovered by
Discovery Paper - Authors 0
Discovery Paper - Title
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+212771+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%20212771%20b/
HD 212771 b
HD 212771 b

  • HD 212771 b is an exoplanet orbiting the star HD 212771, located about 364.4 light-years (111.7 pc) away from Solar System. Its discovery was publicly announced on 2010.
  • The host star HD 212771 has apparent magnitude of 7.6, with absolute magnitude of 2.4.
  • It is 1.1 times more massive and 5.0 times bigger compared with our Sun. The surface temperature is 5121 with its spectral types of G8IV
  • In this planetary system, the extrasolar planet HD 212771 b orbits around the star HD 212771 every 373.3 days with its orbital distance of 1.22 AU ( 182509402.3 km)
  • (Projected orbit of HD 212771 b around its host star HD 212771)


  • The Star HD 212771 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 2.841 AU ( 424949838.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 3.926 AU ( 587391729.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 5.983 AU ( 895055006.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 8.804 AU ( 1317112651.3 km)
  • Radiation at Planetary Boundary of HD 212771 b : 14165.90 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 212771)



  • Kopparapu Recent Venus for Star HD 212771 distance : 3.055 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 212771 distance : 3.868 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 212771 distance : 3.736 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 212771 distance : 4.099 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 212771 distance : 6.977 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 212771 distance : 7.359 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 212771)



  • Original Kopparapu Recent Venus for Star HD 212771 distance : 3.026 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 212771 distance : 3.984 AU
  • Original Kopparapu Moist Greenhouse for Star HD 212771 distance : 4.004 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 212771 distance : 7.095 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 212771 distance : 7.378 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 212771)



    (Position in Stellar Map of star HD 212771 and its Exoplanet HD 212771 b)



    (Zoomed position in Stellar Map of star HD 212771 and its Exoplanet HD 212771 b (zoom level 3))

    (Synthetic Spectrum of star HD 212771*)
    *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