Imaginary Picture of tau Boo A b

Display orbital revolution of tau Boo A b around the hoststar tau Boo A
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Exoplanet Name : tau Boo A b
Alternate Name : tau Boo b
Status : Confirmed
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.)
Surface Gravity (G Earth) 13.1525
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 :
Radius Detection : Theoretical
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : tau Boo A
Alternate Name : tau Boo
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
UV portion[%]: 7.8
Visible portion[%]: 44.8
IR portion[%]: 47.4
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 A b
tau Boo A b

  • tau Boo A b is an exoplanet orbiting the star tau Boo A, 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 A 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 A b orbits around the star tau Boo A every 3.3 days with its orbital distance of 0.05 AU ( 6881502.1 km)
  • (Projected orbit of tau Boo A b around its host star tau Boo A)


  • The Star tau Boo A '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 A b : 1626624.72 W/m2

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



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

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



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

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



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



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

    (Synthetic Spectrum of star tau Boo A*)
    *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