Physics
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003nicm.rept....3s&link_type=abstract
Instrument Science Report NICMOS-2003-003, 15 pages
Physics
Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos
Scientific paper
A review of the NICMOS monthly flat field monitoring data (program IDs: 9326, 9640) indicates that the NICMOS cameras are functioning as expected due in large part to the stable temperature provided by the NICMOS Cooling System (NCS). The flat field data (lamp-on) filter count rates have remained constant following SM3B/SMOV indicating that detector sensitivity and the lamps fluxes have remained constant. Additionally, pixel saturation levels have essentially remained unchanged since SMOV. The number of grot affected pixels has not changed since SMOV indicating stability within the dewar. Note that there was an increase in the number of grot affected pixels following Cycle 7 & 7N with the addition of a large chunk in the lower right quadrant of NIC1. Dithering to remove the affects of grot is recommended. A check of the NIC2 coronagraphic hole image location shows hole motion similar to what was observed during Cycle 7 & 7N. Coronagraphic observers should taylor their observations to minimize the effects of hole motion on their data. Incremental monthly and super flat field reference files have been created and delivered to the HST Archive for user support.
Roye Erin
Schultz Alfred B.
Sosey Megan
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