Early warning of precessing neutron-star black hole binary mergers with the near-future gravitational-wave detectors

Since gravitational and electromagnetic waves from a compact binary coalescence carry independent information about the source, joint observation is important for understanding physical mechanisms of emissions. Rapid detection source localization wave signal are crucial to be successful. For with high signal-to-noise ratio, it even possible detect before merger, which called early warning. In this letter, we estimate performances warning neutron-star black-hole binaries, considering precession effect orbit, near-future detectors such as A+, AdV+, KAGRA+, Voyager. We find that can localized in $100 \,\mathrm{deg^2}$ on sky $\sim 10$--$40 \,\mathrm{s}$ time merger once per year.