Imaginary Picture of HD 191806 b

Display orbital revolution of HD 191806 b around the hoststar HD 191806
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Exoplanet Name : HD 191806 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 8.5200 (Mjup) 2708.8318 (Mearth)
Semi Major Axis / Orbital Distance Calculated 2.8000 (AU) 2.8000 (AU Est.)
Eccentricity : 0.2590
Orbital Period(Yrs) 4.3977
Orbital Period(Observed/Estimated) 1606.30 (Days Obs.) 1602.78 (Days Est.)
Surface Gravity (G Earth) 26.1601
Star Radiation at Atmospheric Boundary: 244.5 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 176.5 (K)
Blackbody T 0.3(K) 165.7 (K)
Blackbody T 0.7(K) 134.1 (K)
Tidally Locked Blackbody T 0.1(K) 209.9 (K)
Tidally Locked Blackbody T 0.3(K) 197.1 (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 191806
Alternate Name :
Star Distance(LY) : 214.3
Stellar Radius(Rsun) : 1.1 (Rsun Estimated)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.1 (Msun Estimated)
Star Age : 2.9 (GY)
Temperature : 6010 (K)
Spectral type : G0
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
Metalicity : 0.3
Absolute Magnitude: 4.0
Apparent Magnitude: 8.1
Right Ascension(RA) 302.3680
Declination (DEC) 52.2763
Hubble Space Telescope Guide Star Catalog (GSC) ID 03571-01270
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+191806+&submit=SIMBAD+search
Open Exoplanet Database Link 0
HD 191806 b
HD 191806 b

  • HD 191806 b is an exoplanet orbiting the star HD 191806, located about 214.3 light-years (65.7 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star HD 191806 has apparent magnitude of 8.1, with absolute magnitude of 4.0.
  • It is 1.1 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 6010 with its spectral types of G0
  • In this planetary system, the extrasolar planet HD 191806 b orbits around the star HD 191806 every 1606.3 days with its orbital distance of 2.80 AU ( 418874038.0 km)
  • (Projected orbit of HD 191806 b around its host star HD 191806)


  • The Star HD 191806 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.856 AU ( 128130568.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.184 AU ( 177109930.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.804 AU ( 269876339.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.655 AU ( 397134856.2 km)
  • Radiation at Planetary Boundary of HD 191806 b : 244.50 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 191806)



  • Kopparapu Recent Venus for Star HD 191806 distance : 0.875 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 191806 distance : 1.109 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 191806 distance : 1.071 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 191806 distance : 1.173 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 191806 distance : 1.946 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 191806 distance : 2.053 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 191806)



  • Original Kopparapu Recent Venus for Star HD 191806 distance : 0.881 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 191806 distance : 1.138 AU
  • Original Kopparapu Moist Greenhouse for Star HD 191806 distance : 1.165 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 191806 distance : 1.981 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 191806 distance : 2.060 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 191806)



    (Position in Stellar Map of star HD 191806 and its Exoplanet HD 191806 b)



    (Zoomed position in Stellar Map of star HD 191806 and its Exoplanet HD 191806 b (zoom level 3))

    (Synthetic Spectrum of star HD 191806*)
    *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