Imaginary Picture of tau Boo b
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Exoplanet Name : tau Boo b
Alternate Name :
Radius (Rjup / Re): 1.0600 (Rjup) 11.8815 (Rearth)
Mass (Mjup / Me): 5.8400 (Mjup) 1856.7579 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0460 (AU) 0.0460 (AU Est.)
Eccentricity : 0.0787
Orbital Period(Yrs) 0.0091
Orbital Period(Observed/Estimated) 3.31 (Days Obs.) 3.16 (Days Est.)
Star Radiation at Atmospheric Boundary: 1626624.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1593.9 (K)
Blackbody T 0.3(K) 1496.9 (K)
Blackbody T 0.7(K) 1211.1 (K)
Tidally Locked Blackbody T 0.1(K) 1895.5 (K)
Tidally Locked Blackbody T 0.3(K) 1780.1 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection : Radial Velocity
Radius Detection : Theoretical
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : tau Boo
Alternate Name :
Star Distance(LY) : 50.9
Stellar Radius(Rsun) : 1.3 (Rsun Measured)
Stellar Mass(Msun) : 1.3 (Msun Measured) 1.2 (Msun Estimated)
Star Age : 2.5 (GY)
Temperature : 6309 (K)
Spectral type : F7 V
Metalicity : 0.3
Absolute Magnitude: 3.5
Apparent Magnitude: 4.5
Right Ascension(RA) 206.8156
Declination (DEC) 17.4561
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "S. Desidera, M. Barbieri"
Discovery Paper - Title Properties of planets in binary systems. The role of binary separation
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=tau+Boo+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/tau%20Boo%20A%20b/
tau Boo b
tau Boo b

  • tau Boo b is an exoplanet orbiting the star tau Boo, located about 50.9 light-years (15.6 pc) away from Solar System. Its discovery was publicly announced on 1996.
  • The host star tau Boo has apparent magnitude of 4.5, with absolute magnitude of 3.5.
  • It is 1.3 times more massive and 1.3 times bigger compared with our Sun. The surface temperature is 6309 with its spectral types of F7 V
  • In this planetary system, the extrasolar planet tau Boo b orbits around the star tau Boo every 3.3 days with its orbital distance of 0.05 AU ( 6881502.1 km)
  • (Projected orbit of tau Boo b around its host star tau Boo)


  • The Star tau Boo 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 1.148 AU ( 171694831.9 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.586 AU ( 237327126.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 2.417 AU ( 361634020.9 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 3.557 AU ( 532160304.0 km)
  • Radiation at Planetary Boundary of tau Boo b : 1626624.72 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star tau Boo)



  • Kopparapu Recent Venus for Star tau Boo distance : 1.152 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star tau Boo distance : 1.459 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star tau Boo distance : 1.409 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star tau Boo distance : 1.544 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star tau Boo distance : 2.546 AU
  • Kopparapu Outer Boundary for Early Mars for Star tau Boo distance : 2.685 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star tau Boo)



  • Original Kopparapu Recent Venus for Star tau Boo distance : 1.166 AU
  • Original Kopparapu Runaway Greenhouse for Star tau Boo distance : 1.496 AU
  • Original Kopparapu Moist Greenhouse for Star tau Boo distance : 1.543 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star tau Boo distance : 2.592 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star tau Boo distance : 2.695 AU

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



    (Position in Stellar Map of star tau Boo and its Exoplanet tau Boo b)



    (Zoomed position in Stellar Map of star tau Boo and its Exoplanet tau Boo b (zoom level 3))