HD 18438

Display orbital revolution around the star HD 18438
Imaginary Picture of Star HD 18438
Star Name : HD 18438
Alternate Name :
Star Distance (LY/pc): 733.8510 (LY) 225.0000 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 88.5000 (Rsun, estimated)
Stellar Mass (Msun): 1.8400 (Msun/observed) 1.8400 (Msun/estimated)
Spectral type : M2.5 III
Metalicity : -0.4000
Absolute Magnitude : -1.16
Apparent Magnitude : 5.60
Right Ascension(RA) : 46.53333
Declination(DEC) : 79.41861
  • This is the HD 18438 . The star HD 18438 islocated about 733.9 light-years (225.0 pc) away from our Solar System.
  • The star HD 18438 has apparent magnitude of 5.6, with absolute magnitude of -1.2.
  • It is 1.8 times more massive and 88.5 times bigger compared with our Sun. The surface temperature is 3860 with its spectral types of M2.5 III
  • Number of Extrasolar Planets : 1
  • Name of the 1 Planet HD 18438 b radius 1.049861 mass 21.000000 orbital distance 2.100000
    (Illustration of the HD 18438's Planetary System)



    The Star HD 18438 's habitable zone is located at the following distance

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 28.566 AU ( 4273424076.6 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 39.486 AU ( 5906988853.0 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 60.168 AU ( 9000943798.1 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 88.539 AU ( 13245283105.0 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 18438)



    Kopparapu's Recent Venus for Star HD 18438 distance : 32.095 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star HD 18438 distance : 40.620 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star HD 18438 distance : 39.229 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star HD 18438 distance : 42.943 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star HD 18438 distance : 77.629 AU
    Kopparapu's Outer Boundary for Early Mars for Star HD 18438 distance : 81.898 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 18438)



  • Original Kopparapu Recent Venus for Star HD 18438 distance : 31.733 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 18438 distance : 42.020 AU
  • Original Kopparapu Moist Greenhouse for Star HD 18438 distance : 41.988 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 18438 distance : 78.868 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 18438 distance : 82.021 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 18438)



    (Position in Stellar Map of star HD 18438 )



    (Zoomed position in Stellar Map of star HD 18438 (zoom level 3))

    (Synthetic Spectrum of star HATS-33*)
    *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