Calibration of ACS/WFC Absolute Scale and Rotation for Use in creation of a JWST Astrometric Reference Field

Details Calibration of ACS/WFC Absolute Scale and Rotation for Use in creation of a JWST Astrometric Reference Field Calibration of ACS/WFC Absolute Scale and Rotation for Use in creation of a JWST Astrometric Reference Field

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007acs..rept....7v&link_type=abstract

Instrument Science Report ACS 2007-07, 22 pages

Astronomy and Astrophysics

Astronomy

Hubble Space Telescope, Hst, Space Telescope Science Institute, James Webb Space Telescope, Jwst, Calibration, Wide Field Camera, Wfc

Scientific paper

Astrometric calibrations of JWST will use observations of a reference field in the Large Magellanic Cloud. This field will itself be astrometrically calibrated using observations with ACS/WFC on HST. The higher-order geometric distortions of ACS/WFC have previously been calibrated to high accuracy. However, the absolute scale and orientation of ACS/WFC are not known with similar accuracy. We therefore performed observations of the open cluster M35 to calibrate the absolute scale and orientation of ACS/WFC. Astrometric positions for stars in this field are obtained by combining a catalog obtained from many years of HST/FGS observations with the astrometry in the UCAC2 catalog. We also use several years of repeated observations of 47 Tuc to demonstrate the stability with time of the ACS/WFC scale and rotation. The understanding of the ACS/WFC scale and rotation obtained through these analyses is sufficiently accurate to meet the JWST astrometric requirements.

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