NICMOS Optical Plate Scale

Details NICMOS Optical Plate Scale NICMOS Optical Plate Scale

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11411w&link_type=abstract

HST Proposal ID #11411. Cycle 17

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Scientific paper

This proposal aims at measuring the plate scale, field rotation and field distortion for each of the NICMOS cameras. The resulting coefficients will allow an accurate transformation of pixel positions in NICMOS images to relative or absolute astronomical coordinates. The distortion corrections for the NICMOS cameras are small but important when dithering, coadding and drizzling images. This program is based on the SMOV3b proposal 8982. The proposal has three different targets: NGC1850, NGC1850-I and NGC1850-II. The first target is located close to the center of the cluster, while the other targets are offset {but still within the central parts of the cluster}. The alternative targets can be used if acquisition can't be achieved with the primary target. In those cases, visits 10, 20, 30, visits 11, 21, 31 or visits 40, 50, 60 are to be used. The priority order is: Visits 01 02 03 : center of cluster, visit 02 03 linked to 01, dual guide stars Visits 10 20 30 : offset I, visit 20 30 linked to 10, dual guide stars Visits 11 21 31 : offset I, visits not linked, single guide star Visits 40 50 60 : offset II, visits not linked, single guide star;

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