About J1944-10
J1944-10 is an uncommon pulsar. It spins once every 409.135 ms and has a dispersion measure of 31.01 pc cm⁻³.
The collapsed core of a star that exploded: about one and a half Suns of matter crushed into a ball the size of a city, held up only by the refusal of neutrons to be squeezed further.