NICMOS Mode-2 Coronagraphic Target Acquisition Test

Details NICMOS Mode-2 Coronagraphic Target Acquisition Test NICMOS Mode-2 Coronagraphic Target Acquisition Test

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11413s&link_type=abstract

HST Proposal ID #11413. Cycle 17

Physics

Scientific paper

NICMOS coronagraphy is extremely sensitive to small centering errors which can result from imperfections in the target acquisition {TA} process. During HST Cycle 7 the on-board {TA} process was augmented which resulted in post-acquisition dispersions of target placements w.r.t. the fiducial position in the occulting system with 1-sigma RSX {a} dispersions of 0.08 mas {or 1/10 pixel} between targets and {b} repeatability of 0.04 mas for identically executed target acquisitions of the same target. This levels of acquisition precision and accuracy are required to enable high-contrast imaging near occulted targets of which the system is capable. This proposal corresponds to SMOV activity NIC-10.;

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