NICER observation list: Target ID 359001

We propose to continue the study of temporal and spectral properties of RXJ0019+2156, a supersoft X-ray source associated with nuclear burning of accreted gas on the surface of a white dwarf. Our goals are to characterize the X-ray variability, to measure how the effecting radius changes with temperature and luminosity, to search for non-thermal continuum components, to conduct QPO searches at frequencies above 10mHz, and to search for X-ray lines that may be assoicated with the central source or the outflow. The NICER observations during the Prime Mission show progress for this study, but results are limited by the unexpected faintness of the source in late 2017 and the percentage of the exposures conducted in short intervals.