NICER observation list: Target ID 354701

The ultracompact white dwarf systems HM Cnc and V407 Vul represent unique opportunities to probe binary evolution driven by gravitational radiation and mass transfer. Initial NICER observations have provided new, precise frequency measurements in both systems, and present constraints on the 2nd derivative of the orbital frequency for HM Cnc are beginning to become theoretically informative, and this will only improve as we extend the temporal baseline. The additional observations proposed here will do just that for each source, enabling new probes of their orbital evolution.