Imaginary Picture of Aldebaran b
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Exoplanet Name : Aldebaran b
Alternate Name :
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 6.4700 (Mjup) 2057.0589 (Mearth)
Semi Major Axis / Orbital Distance Calculated 1.4600 (AU) 1.4600 (AU Est.)
Eccentricity : 0.1000
Orbital Period(Yrs) 1.7220
Orbital Period(Observed/Estimated) 628.96 (Days Obs.) 606.15 (Days Est.)
Star Radiation at Atmospheric Boundary: 316384.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 1058.5 (K)
Blackbody T 0.3(K) 994.1 (K)
Blackbody T 0.7(K) 804.3 (K)
Tidally Locked Blackbody T 0.1(K) 1258.8 (K)
Tidally Locked Blackbody T 0.3(K) 1182.1 (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 : Aldebaran
Alternate Name : alf Tau
Star Distance(LY) : 66.6
Stellar Radius(Rsun) : 45.1 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 6.6 (GY)
Temperature : 4055 (K)
Spectral type : K5III
Metalicity : -0.3
Absolute Magnitude: -0.7
Apparent Magnitude: 0.8
Right Ascension(RA) 68.9802
Declination (DEC) 16.5092
Hubble Space Telescope Guide Star Catalog (GSC) ID 01266-01416
Discovered by
Discovery Paper - Authors "A. P. Hatzes, W. D. Cochran, M. Endl, E. W. Guenther, P. MacQueen, M. Hartmann, M. Zechmeister, I. Han, B.-C. Lee, G.A.H. Walker, S. Yang, A.M. Larson, K.-M. Kim, D. E. Mkrtichian, M. Doellinger, A.E. Simon, L. Girardi"
Discovery Paper - Title "Long-lived, long-period radial velocity variations in Aldebaran: A planetary companion and stellar activity"
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Aldebaran+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/alf%20Tau%20b/
Aldebaran b
Aldebaran b

  • Aldebaran b is an exoplanet orbiting the star Aldebaran, located about 66.6 light-years (20.4 pc) away from Solar System. Its discovery was publicly announced on 1998.
  • The host star Aldebaran has apparent magnitude of 0.8, with absolute magnitude of -0.7.
  • It is 1.1 times more massive and 45.1 times bigger compared with our Sun. The surface temperature is 4055 with its spectral types of K5III
  • In this planetary system, the extrasolar planet Aldebaran b orbits around the star Aldebaran every 629.0 days with its orbital distance of 1.46 AU ( 218412891.2 km)
  • (Projected orbit of Aldebaran b around its host star Aldebaran)


  • The Star Aldebaran 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 16.065 AU ( 2403346401.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 22.207 AU ( 3322052796.1 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 33.838 AU ( 5062073292.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 49.794 AU ( 7449062605.1 km)
  • Radiation at Planetary Boundary of Aldebaran b : 316384.80 W/m2

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



  • Kopparapu Recent Venus for Star Aldebaran distance : 17.976 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Aldebaran distance : 22.752 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Aldebaran distance : 21.974 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Aldebaran distance : 24.152 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Aldebaran distance : 43.060 AU
  • Kopparapu Outer Boundary for Early Mars for Star Aldebaran distance : 45.426 AU

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



  • Original Kopparapu Recent Venus for Star Aldebaran distance : 17.752 AU
  • Original Kopparapu Runaway Greenhouse for Star Aldebaran distance : 23.523 AU
  • Original Kopparapu Moist Greenhouse for Star Aldebaran distance : 23.488 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Aldebaran distance : 43.750 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Aldebaran distance : 45.499 AU

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



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



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