Closest planet to a star

The closest exoplanet to its parent star is PSR J1719-1438 b, which orbits its host star, a pulsar, at a distance of only 0.0044 au (660,000 kilometres, or less than twice the distance separating Earth and the Moon). It completes an orbit once every 131 minutes.

Discovered at the Parkes radio observatory in 2011 by the tiny variations in the rhythmic radio output by its host pulsar caused by the planet's rapid orbit.