Kapteyn's

Display orbital revolution around the star Kapteyn's
Imaginary Picture of Star Kapteyn's
Star Name : Kapteyn's
Alternate Name :
Star Distance (LY/pc): 12.7574 (LY) 3.9114 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 0.2900 (Rsun, estimated)
Stellar Mass (Msun): 0.2810 (Msun/observed) 0.2810 (Msun/estimated)
Spectral type : dM1
Metalicity : -0.8600
Absolute Magnitude : 10.84
Apparent Magnitude : 8.80
Right Ascension(RA) : 77.91909
Declination(DEC) : -45.01833
  • This is the Kapteyn's . The star Kapteyn's islocated about 12.8 light-years ( 3.9 pc) away from our Solar System.
  • The 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
  • Number of Extrasolar Planets : 2
  • Name of the 1 Planet Kapteyn's b radius 0.134948 mass 0.015100 orbital distance 0.168000
  • Name of the 2 Planet Kapteyn's c radius 0.148480 mass 0.022000 orbital distance 0.311000
    (Illustration of the Kapteyn's's Planetary System)



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



    Kopparapu's Recent Venus for Star Kapteyn's distance : 0.089 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star Kapteyn's distance : 0.113 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star Kapteyn's distance : 0.109 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star Kapteyn's distance : 0.119 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star Kapteyn's distance : 0.220 AU
    Kopparapu's 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 )



    (Zoomed position in Stellar Map of star Kapteyn's (zoom level 3))

    (Synthetic Spectrum of star HD 219134*)
    *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