Tau Bootis hosts both a "hot Jupiter" planet and a much more
distant binary companion.
The circle shows the location of the class F star Tau Bootis (in
the constellation Bootes). The planet,
which has a mass at least 3.87 times that of Jupiter, has one of
the shortest known periods, only 3.31 days, and orbits at a close
distance of 0.046 astronomical units from the star (6.9 million
kilometers, 12 percent Mercury's distance from the Sun) in a nearly
circular orbit, making it one of the several "hot Jupiter's known.
The planet, while not actually seen, may have been detected in
light reflected from the central star.