Imaginary Picture of Cl Tau b

Display orbital revolution of Cl Tau b around the hoststar CI Tau
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Exoplanet Name : Cl Tau b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 11.6000 (Mjup) 3688.0808 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0817 (AU Est.)
Eccentricity : 0.2500
Orbital Period(Yrs) 0.0246
Orbital Period(Observed/Estimated) 8.99 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 35.6170
Star Radiation at Atmospheric Boundary: 58405.6 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 693.8 (K)
Blackbody T 0.3(K) 651.6 (K)
Blackbody T 0.7(K) 527.2 (K)
Tidally Locked Blackbody T 0.1(K) 825.1 (K)
Tidally Locked Blackbody T 0.3(K) 774.9 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : CI Tau
Alternate Name :
Star Distance(LY) : 515.3
Stellar Radius(Rsun) : 0.8 (Rsun Estimated)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4600 (K)
Spectral type : K4IV
UV portion[%]: 1.9
Visible portion[%]: 32.7
IR portion[%]: 65.4
Metalicity : 0.0
Absolute Magnitude: 7.0
Apparent Magnitude: 13.0
Right Ascension(RA) 68.4667
Declination (DEC) 22.8417
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK
Open Exoplanet Database Link
Cl Tau b
Cl Tau b

  • Cl Tau b is an exoplanet orbiting the star CI Tau, located about 515.3 light-years (158.0 pc) away from Solar System. Its discovery was publicly announced on 2016.
  • The host star CI Tau has apparent magnitude of 13.0, with absolute magnitude of 7.0.
  • It is 0.9 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 4600 with its spectral types of K4IV
  • In this planetary system, the extrasolar planet Cl Tau b orbits around the star CI Tau every 9.0 days with its orbital distance of 0.08 AU ( 12220535.6 km)
  • (Projected orbit of Cl Tau b around its host star CI Tau)


  • The Star CI Tau 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.386 AU ( 57776030.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.534 AU ( 79861572.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.813 AU ( 121691362.7 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.197 AU ( 179074171.1 km)
  • Radiation at Planetary Boundary of Cl Tau b : 58405.58 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star CI Tau)



  • Kopparapu Recent Venus for Star CI Tau distance : 0.425 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star CI Tau distance : 0.538 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star CI Tau distance : 0.520 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star CI Tau distance : 0.571 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star CI Tau distance : 0.992 AU
  • Kopparapu Outer Boundary for Early Mars for Star CI Tau distance : 1.046 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star CI Tau)



  • Original Kopparapu Recent Venus for Star CI Tau distance : 0.419 AU
  • Original Kopparapu Runaway Greenhouse for Star CI Tau distance : 0.555 AU
  • Original Kopparapu Moist Greenhouse for Star CI Tau distance : 0.555 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star CI Tau distance : 1.008 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star CI Tau distance : 1.049 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star CI Tau)



    (Position in Stellar Map of star CI Tau and its Exoplanet Cl Tau b)



    (Zoomed position in Stellar Map of star CI Tau and its Exoplanet Cl Tau b (zoom level 3))

    (Synthetic Spectrum of star CI Tau*)
    *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