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PSR B1257+12 star system

PSR B1257+12 is a millisecond pulsar located 2,300 light-years from the Sun in the constellation of Virgo, rotating at about 161 times per second, it is nicknamed Lich.
The pulsar has a planetary system with three known planets, named Draugr, Poltergeist and Phobetor respectively.
They were both the first extrasolar planets and the first pulsar planets to be discovered; B and C in 1992 and A in 1994. A is the lowest-mass planet yet discovered by any observational technique, with somewhat less than twice the mass of Earth's moon.