HST Pre-SM4 Focal Plane Alignment & ACS Absolute Scale

Details HST Pre-SM4 Focal Plane Alignment & ACS Absolute Scale HST Pre-SM4 Focal Plane Alignment & ACS Absolute Scale

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop11021l&link_type=abstract

HST Proposal ID #11021. Cycle 15

Astronomy and Astrophysics

Astronomy

Scientific paper

This proposal will determine and monitor the FGSs and SI positions and orientations in V2,V3 space. Accuracy goals are < 50 mas for position and between 0.04 and 0.004 degrees for angle depending on SI. An astrometric open cluster M35 is observed using guidestars with positions determined to ~ 20 mas. One or more astrometric targets are placed in the available SIs' major channels as well as each FGS, and POS TARGs step the targets over a significant fraction of the detector. This proposal will serve to update the FGS and SI positions and angles, which have trended, uncalibrated, since ~2002, at a rate between 0.1 and 0.2 arcseconds or more per year. This will execute before 22 December 2006. A single orbit visit will execute later but before SM4/SMOV and will only include position/angle checks of any SI trends and not contain the more costly FGS-FGS alignment, which will need to be performed during SM4/SMOV. Finally, a special visit is included in this proposal which will yield the absolute scale of ACS/WFC with an accuracy of ~2x10-5 by observing a subset of M35 astrometric cluster members with relative positions known to < 1 mas and absolute separations known to ~2x10-5 via FGS calibrations over mission life. This transfers the well-determined FGS absolute scale knowledge onto ACS/WFC, with the goal of then impressing that calibration onto an HST-JWST common field e.g. LMC in order to support JWST calibration requirements.

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