In-Orbit Verification of theNICMOS G141 GrismEfficiency

Computer Science – Performance

Scientific paper

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Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3

Scientific paper

The NICMOS Camera #3 (NIC3) includes two grisms, G098 and G141, designed to sample the near IR regime from 0.8 microns through 2.3 microns. The grism performance was verified during SMOV2 by the NICMOS Instrument Definition Team and the results indicated performance as predicted by design and ground-based lab tests. However, theresults were not made available in publishable form. In this report, the in-orbit calibration data for G141 (provided by W. Freudling, ECF) are again compared to the design values for the grating efficiency. The results are consistent with the predicted values. The motivation for this study comes from the plan to use the same grism for the Wide Field Camera3 (WFC3) to be launched to Hubble in late 2003. The WFC3 IPT team also intends to measure the grism master ruling and spare grism in the lab. Our goal is to verify the design of the grism as well as the in-orbit data to make sure that this grism matches the requirements set forth by the Scientific Oversight Committee for the WFC3.

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