Instrument Science Report WFPC2 96-07:
WFPC2 Throughput Stability in the Extreme Ultraviolet
J. MacKenty, S. Baggett
May 29, 1996
We present a measurement of the stability of the WFPC2 throughput in the Ly-a passband during its first year in orbit. We find that the throughput has remained unchanged with an uncertainty of 10 to 20%. In light of the near total loss of Ly-a reflectivity of the WF/PC-1's pickoff mirror during its stay in orbit, this suggests that WFPC2 POM is not likely to develop the same problem unless a new source of contamination is introduced during future servicing missions.