5.4	Cycle 19 Calibration and Monitoring Program

5.4.1 Active FGS1r Calibration and Monitoring Programs

A short summary is given for each FGS1r calibration and monitoring observation included in the Cycle 19 calibration plan. For specific information, please refer to the STScI FGS Web page (under the topic FGS and Calibration Plans”) and to the HST Schedule and Program Information Web page:

http://www.stsci.edu/hst/scheduling/program_information

5.4.1

Active FGS1r Calibration and Monitoring Programs

•	Prop 12727: Long Term Monitoring of FGS1r in Position mode

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The open cluster M35 will be observed six times per year to evaluate the stability of the FOV, plate scale, and optical field angle distortions (OFAD) in FGS1r. Products will include calibration database parameters which remove these effects in science data. Additional calibrations will be serendipitously performed as well, including (but not limited to) monitoring the FGS1r photometric calibration, lateral color (shift of a star’s centroid as a function of spectral color due to FGS1r’s refractive optics), and the F583W/F5ND cross filter calibration at several locations in the FOV.

•	Prop 12728: FGS1r Transfer Mode Calibration

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This proposal uses FGS1r in Transfer mode to observe single stars to obtain the interference fringes of point sources. These data are used by FGS data analysis tools for studying binary and hierarchical multiple star systems. For Cycle 19 two standard stars will be observed, Upgren69 (B-V= 0.58) and HD 233877 (B-V = 1.1) as these best meet the needs of the Cycle 19 FGS GO program.