About J1126-2737
J1126-2737 is an uncommon pulsar. It spins once every 358.161 ms and has a dispersion measure of 26.86 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.