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We present the discovery of 528.6 Hz pulsations in the new X-ray transientMAXI J1816-195. Using NICER, we observed the first recorded transient outburstfrom the neutron star low-mass X-ray binary MAXI J1816-195 over a period of 28days. From a timing analysis of the 528.6 Hz pulsations, we find that thebinary system is well described as a circular orbit with an orbital period of4.8 hours and a projected semi-major axis of 0.26 light-seconds for the pulsar,which constrains the mass of the donor star to $0.10-0.55 M_\odot$.Additionally, we observed 15 thermonuclear X-ray bursts showing a gradualevolution in morphology over time, and a recurrence time as short as 1.4 hours.We did not detect evidence for photospheric radius expansion, placing an upperlimit on the source distance of 8.6 kpc.

The discovery of the 528.6 Hz accreting millisecond X-ray pulsar MAXI J1816-195