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Tau Botisτ Botis (τ Boo / Tau Botis) is a 4th magnitude star in the constellation of Botes. The system is a binary. The primary component is a yellow-white dwarf (spectral type F7 V) and secondary is a dim red dwarf (spectral type M2 V). The system is relatively nearby, distance being about 51 light years. The primary star should be easily visible to the unaided eye under dark skies. In 1997 a planet, designated as Tau Botis Ab was discovered orbiting the primary star. There is also some indications of another, more distant planet orbiting the star.
Tau Botis A The primary star, Tau Botis A is a yellow-white dwarf. It is 20% more massive than our Sun and thus is somewhat brighter and hotter. It has a radius 1.9 times solar, and is probably about 1300 million years old. Since it is more massive than the Sun, its lifespan is shorter being less than 6000 million years. It is also listed as a suspected variable star. However, the star is not variable.
Tau Botis B Tau Botis B is a dim red dwarf orbiting the primary star at a distance of 240 AU. One orbit around the primary would take thousands of years to complete.
External links Botes, Tau Botes, 4 120136 67275
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