tau Bootes A Planetary System Data

PlanetOrbital Elements Orbital Period (years) Minimum Mass (ME) Discovery
DesignationName Semimajor Axis (AU)Eccentricity Discoverer NameAnnouncement Date
tau Bootes A b  0.0470.02 0.0090701320 G. Marcy & R.P. Butler1996 Jun 14
1 AU = 1.49597870691·1011 m            1 year = 365.25 days = 31557600 s            1 ME = 5.9742·1024 kg
tau Bootes A has an M2 dwarf companion, tau Bootes B, which orbits with a period of ~2000 years, semi-major axis of 245 AU, and an eccentricity of 0.91 [Ref: Hale (1994)]

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