NICMOS Focus Sweep at 2 FOM positions

Details NICMOS Focus Sweep at 2 FOM positions NICMOS Focus Sweep at 2 FOM positions

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7791n&link_type=abstract

HST Proposal ID #7791

Other

Hst Proposal Id #7791

Scientific paper

This proposal is built to run a NIC3 focus sweep from -1.5mm to -9.5mm given that the mechanical PAM default setting is -9.5mm. The FOM will then be moved +18 arcsec in Y to an offset position where another focus sweep will be executed in the same manner to determine where image quality is the best. Thermal background images will be taken at both the current FOM position, and then at offset FOM positions to check that vignetting is reduced. This proposal should be scheduled to run AS SOON AS POSSIBLE before 27-SEP-97 as part of calibration to support the NIC3 campaign. Objectives: a} Cover sufficient region of PAM focus space to ensure the optimal locations are included b} Measure vignetting and image quality at different FOM positions

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