Imaginary Picture of HD 68988 c

Display orbital revolution of HD 68988 c around the hoststar HD 68988
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Exoplanet Name : HD 68988 c
Alternate Name :
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 15.0000 (Mjup) 4769.0700 (Mearth)
Semi Major Axis / Orbital Distance Calculated 13.2000 (AU) 13.2000 (AU Est.)
Eccentricity : 0.4500
Orbital Period(Yrs) 34.7698
Orbital Period(Observed/Estimated) 12700.00 (Days Obs.) 15990.44 (Days Est.)
Surface Gravity (G Earth) 46.0565
Star Radiation at Atmospheric Boundary: 10.1 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 79.6 (K)
Blackbody T 0.3(K) 74.8 (K)
Blackbody T 0.7(K) 60.5 (K)
Tidally Locked Blackbody T 0.1(K) 94.7 (K)
Tidally Locked Blackbody T 0.3(K) 88.9 (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 68988
Alternate Name :
Star Distance(LY) : 195.5
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 1.2 (Msun Measured) 1.9 (Msun Estimated)
Star Age : 6.8 (GY)
Temperature : 5767 (K)
Spectral type : G0
UV portion[%]: 7.8
Visible portion[%]: 44.7
IR portion[%]: 47.5
Metalicity : 0.2
Absolute Magnitude: 4.3
Apparent Magnitude: 8.2
Right Ascension(RA) 124.5924
Declination (DEC) 61.4606
Hubble Space Telescope Guide Star Catalog (GSC) ID 04126-00818
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+68988+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%2068988%20b/
HD 68988 c
HD 68988 c

  • HD 68988 c is an exoplanet orbiting the star HD 68988, located about 195.5 light-years (60.0 pc) away from Solar System. Its discovery was publicly announced on 2006.
  • The host star HD 68988 has apparent magnitude of 8.2, with absolute magnitude of 4.3.
  • It is 1.2 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5767 with its spectral types of G0
  • In this planetary system, the extrasolar planet HD 68988 c orbits around the star HD 68988 every 12700.0 days with its orbital distance of 13.20 AU ( 1974691893.2 km)
  • (Projected orbit of HD 68988 c around its host star HD 68988)


  • The Star HD 68988 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.821 AU ( 122874812.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.135 AU ( 169845101.3 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.730 AU ( 258806347.8 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.546 AU ( 380844878.3 km)
  • Radiation at Planetary Boundary of HD 68988 c : 10.12 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 68988)



  • Kopparapu Recent Venus for Star HD 68988 distance : 0.852 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 68988 distance : 1.079 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 68988 distance : 1.042 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 68988 distance : 1.142 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 68988 distance : 1.906 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 68988 distance : 2.010 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 68988)



  • Original Kopparapu Recent Venus for Star HD 68988 distance : 0.853 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 68988 distance : 1.109 AU
  • Original Kopparapu Moist Greenhouse for Star HD 68988 distance : 1.128 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 68988 distance : 1.939 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 68988 distance : 2.016 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 68988)



    (Position in Stellar Map of star HD 68988 and its Exoplanet HD 68988 c)



    (Zoomed position in Stellar Map of star HD 68988 and its Exoplanet HD 68988 c (zoom level 3))

    (Synthetic Spectrum of star HD 68988*)
    *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