NICER observation list: Target ID 252002

Abstract

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 {\it NICER} observations have provided new, precise frequency measurements in both systems, and a first indication for a slowing of the spin-up in HM Cnc. We propose additional observations to extend the timing baselines for each source, enabling new, unique probes of their orbital evolution.
Obsid RA DEC l b Start End Exposure Number of
Modules
Number of
Processing
Status of
Processing
Date of
Processing
Public
date
2520020101 288.608 24.945 57.728 6.401 58632.3037 58632.5301 5980.0 52 3 VALIDATED 58636.6 58826
2520020102 288.608 24.945 57.728 6.401 58633.0173 58633.6903 9193.0 52 3 VALIDATED 58637.6 58827
2520020201 288.608 24.945 57.728 6.401 58780.1445 58780.1720 2248.0 52 3 VALIDATED 58784.7 58974