Physics
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009wfc..rept...35d&link_type=abstract
WFC3 Instrument Science Report 2009-35, 7 pages
Physics
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3
Scientific paper
Target placement and the execution of offsets are implemented for an HST instrument using information in the Science Instrument Aperture File (SIAF). Exposures of an as- trometric stellar cluster are used to measure the location and orientation of the detector in the spacecraft V2,V3 frame, and to provide aperture locations and orientations for the SIAF. Observations of the open cluster NGC 188, made in SMOV program 11442, were used to produce a SIAF file for the WFC3/UVIS detector that took effect on 3 August 2009. The location of the detector in the V2,V3 frame was shifted by (-0.57", +2.71") and its orientation was rotated by -0.074 degrees relative to the placement defined in the previous SIAF, which was determined from ground-based tests and modelling. The rms errors in the shift and rotation are (0.011",0.015") and 0.027 degrees.
Cox Catherine
Dressel Linda Lou
Lallo Matthew
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