BD-21 397

Display orbital revolution around the star BD-21 397
Imaginary Picture of Star BD-21 397
Star Name : BD-21 397
Alternate Name :
Star Distance (LY/pc): 77.4294 (LY) 23.7400 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 0.7470 (Rsun, estimated)
Stellar Mass (Msun): 0.6790 (Msun/observed) 0.6790 (Msun/estimated)
Spectral type : K7V
Metalicity : 0.1200
Absolute Magnitude : 7.92
Apparent Magnitude : 9.80
Right Ascension(RA) : 33.30000
Declination(DEC) : -21.19639
  • This is the BD-21 397 . The star BD-21 397 islocated about 77.4 light-years (23.7 pc) away from our Solar System.
  • The star BD-21 397 has apparent magnitude of 9.8, with absolute magnitude of 7.9.
  • It is 0.7 times more massive and 0.7 times bigger compared with our Sun. The surface temperature is 4051 with its spectral types of K7V
  • Number of Extrasolar Planets : 2
  • Name of the 1 Planet BD-21 397 b radius 0.907830 mass 0.700000 orbital distance 2.630000
  • Name of the 2 Planet BD-21 397 c radius 0.907830 mass 4.800000 orbital distance 5.900000
    (Illustration of the BD-21 397's Planetary System)



    The Star BD-21 397 's habitable zone is located at the following distance

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.266 AU ( 39728594.5 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.367 AU ( 54915299.9 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.559 AU ( 83678764.3 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.823 AU ( 123136967.4 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star BD-21 397)



    Kopparapu's Recent Venus for Star BD-21 397 distance : 0.297 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star BD-21 397 distance : 0.376 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star BD-21 397 distance : 0.363 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star BD-21 397 distance : 0.398 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star BD-21 397 distance : 0.712 AU
    Kopparapu's Outer Boundary for Early Mars for Star BD-21 397 distance : 0.751 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star BD-21 397)



  • Original Kopparapu Recent Venus for Star BD-21 397 distance : 0.293 AU
  • Original Kopparapu Runaway Greenhouse for Star BD-21 397 distance : 0.389 AU
  • Original Kopparapu Moist Greenhouse for Star BD-21 397 distance : 0.388 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star BD-21 397 distance : 0.723 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star BD-21 397 distance : 0.752 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star BD-21 397)



    (Position in Stellar Map of star BD-21 397 )



    (Zoomed position in Stellar Map of star BD-21 397 (zoom level 3))

    (Synthetic Spectrum of star BD-06 1339*)
    *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