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Q: What photometric information is available from the guiding FGSs regarding the photometry of the Guide Stars? A: Star Selector encoder readings and photomultiplier tube counts are available for Guide Stars at a 40 Hz rate for all astrometry observations.For non-astrometry observations taken after early 1995, 40 Hz Guide Star data is available; for observations made earlier, thtelemetryry format and frequency of the Guide Star data were generally determined by the science instrument, with frequencies ranging from 40 Hz to 0.667 Hz. |
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