PSR J1748−2446ad is the fastest-spinning pulsar known, at 716 Hz, or 42,960 revolutions per minute. This pulsar was discovered by Jason W. T. Hessels of McGill University on November 10, 2004, and confirmed on January 8, 2005. From Wikipedia
This discovery in the 4U 1820-30 system reveals one of the fastest-spinning neutron stars ever observed, offering insights into binary star dynamics.
