Instrument Science Report 2009-02:
WFPC2 F343N Filter Throughput Decline
S. Gonzaga and J. Biretta
April 1, 2009
Observations of the standard star GRW+70D5824 indicate a ~50% decrease in the throughput of the F343N filter during the WFPC2 mission. The decline appears to be linear with time and is approximately uniform across the field of view. Essentially identical results are obtained for the PC1 and WF3 detectors, and no features corresponding to the ~50% throughput decline are seen in external flats. Post-flight laboratory tests on the filter are needed to determine its current spectral properties.
The Complete Paper (PDF 0.89 MB) is available.