Imaginary Picture of Kapteyn's c

Display orbital revolution of Kapteyn's c around the hoststar Kapteyn's
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Exoplanet Name : Kapteyn's c
Alternate Name :
Radius (Rjup / Re): 0.1485 (Rjup) 1.6643 (Rearth)
Mass (Mjup / Me): 0.0220 (Mjup) 6.9946 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.3110 (AU) 0.3110 (AU Est.)
Eccentricity : 0.2300
Orbital Period(Yrs) 0.3327
Orbital Period(Observed/Estimated) 121.54 (Days Obs.) 119.50 (Days Est.)
Surface Gravity (G Earth) 2.5252
Star Radiation at Atmospheric Boundary: 169.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 161.0 (K)
Blackbody T 0.3(K) 151.2 (K)
Blackbody T 0.7(K) 122.3 (K)
Tidally Locked Blackbody T 0.1(K) 191.5 (K)
Tidally Locked Blackbody T 0.3(K) 179.8 (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 : Kapteyn's
Alternate Name :
Star Distance(LY) : 12.8
Stellar Radius(Rsun) : 0.3 (Rsun Measured)
Stellar Mass(Msun) : 0.3 (Msun Measured) 0.3 (Msun Estimated)
Star Age : 8.0 (GY)
Temperature : 3550 (K)
Spectral type : dM1
UV portion[%]: 0.3
Visible portion[%]: 15.6
IR portion[%]: 84.0
Metalicity : -0.9
Absolute Magnitude: 10.8
Apparent Magnitude: 8.8
Right Ascension(RA) 77.9191
Declination (DEC) -45.0183
Hubble Space Telescope Guide Star Catalog (GSC) ID 07594-01580
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=Kapteyn%27s+&submit=SIMBAD+search
Open Exoplanet Database Link 0
Kapteyn's c
Kapteyn's c

  • Kapteyn's c is an exoplanet orbiting the star Kapteyn's, located about 12.8 light-years ( 3.9 pc) away from Solar System. Its discovery was publicly announced on 2014.
  • The host star Kapteyn's has apparent magnitude of 8.8, with absolute magnitude of 10.8.
  • It is 0.3 times more massive and 0.3 times bigger compared with our Sun. The surface temperature is 3550 with its spectral types of dM1
  • In this planetary system, the extrasolar planet Kapteyn's c orbits around the star Kapteyn's every 121.5 days with its orbital distance of 0.31 AU ( 46524937.8 km)
  • (Projected orbit of Kapteyn's c around its host star Kapteyn's)


  • The Star Kapteyn's 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.079 AU ( 11844393.2 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.109 AU ( 16372046.7 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.167 AU ( 24947376.1 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.245 AU ( 36711156.8 km)
  • Radiation at Planetary Boundary of Kapteyn's c : 169.35 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kapteyn's)



  • Kopparapu Recent Venus for Star Kapteyn's distance : 0.089 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kapteyn's distance : 0.113 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kapteyn's distance : 0.109 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kapteyn's distance : 0.120 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kapteyn's distance : 0.220 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kapteyn's distance : 0.232 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kapteyn's)



  • Original Kopparapu Recent Venus for Star Kapteyn's distance : 0.089 AU
  • Original Kopparapu Runaway Greenhouse for Star Kapteyn's distance : 0.117 AU
  • Original Kopparapu Moist Greenhouse for Star Kapteyn's distance : 0.117 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kapteyn's distance : 0.223 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kapteyn's distance : 0.232 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kapteyn's)



    (Position in Stellar Map of star Kapteyn's and its Exoplanet Kapteyn's c)



    (Zoomed position in Stellar Map of star Kapteyn's and its Exoplanet Kapteyn's c (zoom level 3))

    (Synthetic Spectrum of star Kapteyn's*)
    *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