PSR J0952-0607 is the second fastest spinning pulsar known and the most massive neutron star known , according to a study published in Astrophysical Journal Letters. J0952 was discovered in 2016 and is located in the constellation Sextant, about 20,000 light-years away from Earth. It rotates 707 times per second with a rotation period of 1.41 milliseconds, second only to PSR J1748-2446’s 1.40 milliseconds. J0952 is also known as a black widow pulsar because it is devouring a nearby companion star. In the latest study, astronomers at Stanford University, using the Keck I telescope in Hawaii, estimated the mass of J0952 to be 2.35 solar masses, with an error of ±0.17 solar masses, exceeding the 2.08 solar masses of PSR J0740+6620, the known mass The heaviest neutron star.
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