(PSR B1257+12, PSR J1300+1240)
(pulsar with first discovered planet system)
PSR 1257+12 (or PSR B1257+12 or PSR J1300+1240)
is a pulsar and the first star for which an
extra-solar planet was discovered, through pulsar timing,
which occurred in 1992.
It is a planetary system with at least three planets,
PSR 1257+12 A, B, and C (The system's first exoplanet
name was coined before the convention to designate exoplanets with
lower case letters beginning with b, and the three planets are
now also confusingly known by the
conventional designators, PSR 1257+12 b, c, and d).
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