NICER observation list: Target ID 858601

We propose a 54 ks NICER monitoring campaign to observe the highly absorbed HMXB IGR J16320-4751 (Porb ~ 9 days, Pspin ~ 1300 s), with daily 2 ks observations over three consecutive orbits (2 ks/day 9 days 3 orbits = 54 ks). Previous reports indicate pulse dropouts and short flares (~100 s) unrelated to absorption changes, suggesting shifts in the accretion regime. By measuring Fe K-alpha line variations and NH across orbits, we aim to distinguish between X-ray variability due to clumpy absorption versus accretion rate changes, offering insights into the massive star s stellar wind and neutron star accretion physics. Multiple orbits will also help detect phase-locked structures, such as accretion streams or wakes.