Kepler-21 A
Imaginary Picture of Star Kepler-21 A
Star Name : Kepler-21 A
Alternate Name : Kepler-21
Star Distance (LY/pc): 352.2485 (LY) 108.0000 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 1.8600 (Rsun, estimated)
Stellar Mass (Msun): 1.3400 (Msun/observed) 1.3400 (Msun/estimated)
Spectral type : F6IV
Metalicity : -0.1500
Absolute Magnitude : 3.10
Apparent Magnitude : 8.27
Right Ascension(RA) : 287.36181
Declination(DEC) : 38.71389
  • This is the Kepler-21 A . The star Kepler-21 A islocated about 352.2 light-years (108.0 pc) away from our Solar System.
  • The star Kepler-21 A has apparent magnitude of 8.3, with absolute magnitude of 3.1.
  • It is 1.3 times more massive and 1.9 times bigger compared with our Sun. The surface temperature is 6131 with its spectral types of F6IV
  • Number of Extrasolar Planets : 1
  • Name of the 1 Planet Kepler-21 A b radius 0.146200 mass 0.016000 orbital distance 0.042717
    (Illustration of the Kepler-21 A's Planetary System)



    The Star Kepler-21 A 's habitable zone is located at the following distance

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.515 AU ( 226586321.5 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 2.094 AU ( 313201510.4 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 3.190 AU ( 477249790.5 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 4.695 AU ( 702293973.7 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-21 A)



    Kopparapu's Recent Venus for Star Kepler-21 A distance : 1.537 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star Kepler-21 A distance : 1.946 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-21 A distance : 1.879 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star Kepler-21 A distance : 2.059 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star Kepler-21 A distance : 3.408 AU
    Kopparapu's Outer Boundary for Early Mars for Star Kepler-21 A distance : 3.594 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-21 A)



  • Original Kopparapu Recent Venus for Star Kepler-21 A distance : 1.550 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-21 A distance : 1.997 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-21 A distance : 2.051 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-21 A distance : 3.468 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-21 A distance : 3.607 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-21 A)



    (Position in Stellar Map of star Kepler-21 A )



    (Zoomed position in Stellar Map of star Kepler-21 A (zoom level 3))