Imaginary Picture of HD 176986 b

Display orbital revolution of HD 176986 b around the hoststar HD 176986
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Exoplanet Name : HD 176986 b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.1413 (Rjup) 1.5841 (Rearth)
Mass (Mjup / Me): 0.0181 (Mjup) 5.7547 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0630 (AU) 0.0630 (AU Est.)
Eccentricity : 0.0660
Orbital Period(Yrs) 0.0178
Orbital Period(Observed/Estimated) 6.49 (Days Obs.) 6.50 (Days Est.)
Surface Gravity (G Earth) 2.2934
Star Radiation at Atmospheric Boundary: 111848.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 816.2 (K)
Blackbody T 0.3(K) 766.5 (K)
Blackbody T 0.7(K) 620.2 (K)
Tidally Locked Blackbody T 0.1(K) 970.6 (K)
Tidally Locked Blackbody T 0.3(K) 911.5 (K)
Size Class: super-Earth-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 176986
Alternate Name :
Star Distance(LY) : 86.1
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.8 (Msun Estimated)
Star Age : 4.3 (GY)
Temperature : 4931 (K)
Spectral type : K2.5V
UV portion[%]: 2.9
Visible portion[%]: 36.4
IR portion[%]: 60.7
Metalicity : 0.0
Absolute Magnitude: 6.3
Apparent Magnitude: 8.4
Right Ascension(RA) 285.7745
Declination (DEC) -11.0439
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+176986+&submit=SIMBAD+search
Open Exoplanet Database Link
HD 176986 b
HD 176986 b

  • HD 176986 b is an exoplanet orbiting the star HD 176986, located about 86.1 light-years (26.4 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star HD 176986 has apparent magnitude of 8.4, with absolute magnitude of 6.3.
  • It is 0.8 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 4931 with its spectral types of K2.5V
  • In this planetary system, the extrasolar planet HD 176986 b orbits around the star HD 176986 every 6.5 days with its orbital distance of 0.06 AU ( 9418681.9 km)
  • (Projected orbit of HD 176986 b around its host star HD 176986)


  • The Star HD 176986 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.412 AU ( 61621869.6 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.569 AU ( 85177527.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.868 AU ( 129791702.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.277 AU ( 190994175.5 km)
  • Radiation at Planetary Boundary of HD 176986 b : 111848.17 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 176986)



  • Kopparapu Recent Venus for Star HD 176986 distance : 0.447 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 176986 distance : 0.566 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 176986 distance : 0.547 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 176986 distance : 0.600 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 176986 distance : 1.029 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 176986 distance : 1.085 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 176986)



  • Original Kopparapu Recent Venus for Star HD 176986 distance : 0.442 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 176986 distance : 0.583 AU
  • Original Kopparapu Moist Greenhouse for Star HD 176986 distance : 0.585 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 176986 distance : 1.046 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 176986 distance : 1.088 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 176986)



    (Position in Stellar Map of star HD 176986 and its Exoplanet HD 176986 b)



    (Zoomed position in Stellar Map of star HD 176986 and its Exoplanet HD 176986 b (zoom level 3))

    (Synthetic Spectrum of star HD 176986*)
    *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