Physics
Scientific paper
Mar 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000stis.rept....1k&link_type=abstract
Instrument Science Report STIS 00-01, 4 pages
Physics
Hubble Space Telescope, Hst, Space Telescope Science Institute, Stis, Space Telescope Imaging Spectrograph
Scientific paper
Investigation of the high-voltage shutdown of the STIS NUV MAMA in September 1999 led to new information on the potential pointing errors associated with HST observations. We have also re-examined the intrinsic protection capabilities of the STIS MAMAs. Based on these considerations, we are implementing new bright object protection policies for the STIS MAMAs. Once FGS 2r is put into regular service, we will henceforth require that MAMA snapshots be done using two guide stars. For all observations, those that place a target or field object that violates current ground-screening limits for the STIS MAMAs (see ISR STIS 98-08) within 5 arc seconds of the edge of the highest throughput aperture visible in the field of a MAMA observation are not allowed. Targets or field objects falling in an annular region extending from 5 to 13.5 arc seconds from the edge of the highest throughput aperture used in a MAMA observation also have additional restrictions. Any object in this zone producing either a real global count rate in excess of 1.5x106 cts s-1 or a local count rate greater than 500 cts s-1 pixel-1is not permitted.
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