Imaginary Picture of HD 156668 c

Display orbital revolution of HD 156668 c around the hoststar HD 156668
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Exoplanet Name : HD 156668 c
Alternate Name :
Radius (Rjup / Re): 0.1365 (Rjup) 1.5302 (Rearth)
Mass (Mjup / Me): 0.0158 (Mjup) 5.0234 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0503 (AU) 0.0503 (AU Est.)
Eccentricity : 0.2350
Orbital Period(Yrs) 0.0000
Orbital Period(Observed/Estimated) 0.00 (Days Obs.) 4.68 (Days Est.)
Surface Gravity (G Earth) 2.1453
Star Radiation at Atmospheric Boundary: 139304.3 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 862.3 (K)
Blackbody T 0.3(K) 809.7 (K)
Blackbody T 0.7(K) 655.2 (K)
Tidally Locked Blackbody T 0.1(K) 1025.4 (K)
Tidally Locked Blackbody T 0.3(K) 963.0 (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 156668
Alternate Name :
Star Distance(LY) : 79.8
Stellar Radius(Rsun) : 0.7 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.0 (Msun Estimated)
Star Age : 8.6 (GY)
Temperature : 4850 (K)
Spectral type : K3V
UV portion[%]: 2.6
Visible portion[%]: 35.8
IR portion[%]: 61.6
Metalicity : 0.1
Absolute Magnitude: 6.5
Apparent Magnitude: 8.4
Right Ascension(RA) 259.4187
Declination (DEC) 29.2272
Hubble Space Telescope Guide Star Catalog (GSC) ID
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+156668+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%20156668%20b/
HD 156668 c
HD 156668 c

  • HD 156668 c is an exoplanet orbiting the star HD 156668, located about 79.8 light-years (24.5 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star HD 156668 has apparent magnitude of 8.4, with absolute magnitude of 6.5.
  • It is 0.8 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4850 with its spectral types of K3V
  • (Projected orbit of HD 156668 c around its host star HD 156668)


  • The Star HD 156668 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.367 AU ( 54887580.4 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.507 AU ( 75868979.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.773 AU ( 115607535.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.137 AU ( 170121553.1 km)
  • Radiation at Planetary Boundary of HD 156668 c : 139304.33 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 156668)



  • Kopparapu Recent Venus for Star HD 156668 distance : 0.400 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 156668 distance : 0.506 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 156668 distance : 0.489 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 156668 distance : 0.536 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 156668 distance : 0.923 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 156668 distance : 0.973 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 156668)



  • Original Kopparapu Recent Venus for Star HD 156668 distance : 0.395 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 156668 distance : 0.522 AU
  • Original Kopparapu Moist Greenhouse for Star HD 156668 distance : 0.523 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 156668 distance : 0.938 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 156668 distance : 0.976 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 156668)



    (Position in Stellar Map of star HD 156668 and its Exoplanet HD 156668 c)



    (Zoomed position in Stellar Map of star HD 156668 and its Exoplanet HD 156668 c (zoom level 3))

    (Synthetic Spectrum of star HD 156668*)
    *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