tau Cet

Display orbital revolution around the star tau Cet
Imaginary Picture of Star tau Cet
Star Name : tau Cet
Alternate Name :
Star Distance (LY/pc): 11.9047 (LY) 3.6500 (pc)
Stellar Radius (Rsun): 0.0000 (Rsun, measured) 0.7930 (Rsun, estimated)
Stellar Mass (Msun): 0.7830 (Msun/observed) 0.7830 (Msun/estimated)
Spectral type : G8.5 V
Metalicity : -0.5500
Absolute Magnitude : 5.69
Apparent Magnitude : 3.50
Right Ascension(RA) : 26.01670
Declination(DEC) : -15.93750
  • This is the tau Cet . The star tau Cet islocated about 11.9 light-years ( 3.6 pc) away from our Solar System.
  • The star tau Cet has apparent magnitude of 3.5, with absolute magnitude of 5.7.
  • It is 0.8 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5344 with its spectral types of G8.5 V
  • Number of Extrasolar Planets : 4
  • Name of the 1 Planet tau Cet e radius 0.128308 mass 0.012400 orbital distance 0.538000
  • Name of the 2 Planet tau Cet f radius 0.128308 mass 0.012400 orbital distance 1.334000
  • Name of the 3 Planet tau Cet g radius 0.103892 mass 0.005510 orbital distance 0.133000
  • Name of the 4 Planet tau Cet h radius 0.105113 mass 0.005760 orbital distance 0.243000
    (Illustration of the tau Cet's Planetary System)



    The Star tau Cet 's habitable zone is located at the following distance

    Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.491 AU ( 73394615.3 km)
    Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.678 AU ( 101450538.7 km)
    Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.033 AU ( 154588170.0 km)
    Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.521 AU ( 227483264.3 km)
    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star tau Cet)



    Kopparapu's Recent Venus for Star tau Cet distance : 0.521 AU
    Kopparapu's Runaway Greenhouse for Earth-sized planet for Star tau Cet distance : 0.660 AU
    Kopparapu's Runaway Greenhouse for Super-Earth-sized planet for Star tau Cet distance : 0.638 AU
    Kopparapu's Runaway Greenhouse for Mars-sized planet for Star tau Cet distance : 0.699 AU
    Kopparapu's Outer Boundary for Maximum Greenhouse for Star tau Cet distance : 1.181 AU
    Kopparapu's Outer Boundary for Early Mars for Star tau Cet distance : 1.246 AU
    (Habitable zone calculated based on Kopparapu et al.(2013) around the star tau Cet)



  • Original Kopparapu Recent Venus for Star tau Cet distance : 0.518 AU
  • Original Kopparapu Runaway Greenhouse for Star tau Cet distance : 0.680 AU
  • Original Kopparapu Moist Greenhouse for Star tau Cet distance : 0.686 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star tau Cet distance : 1.202 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star tau Cet distance : 1.250 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star tau Cet)



    (Position in Stellar Map of star tau Cet )



    (Zoomed position in Stellar Map of star tau Cet (zoom level 3))

    (Synthetic Spectrum of star K2-391*)
    *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