Other
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11395g&link_type=abstract
HST Proposal ID #11395. Cycle 17
Other
Scientific paper
The maximum thermal motion of the MAMA detectors occurs in the first portion of the orbit immediately following a large angle maneuver leading to maximum external changes on the portion of axial bay closest to the STIS instrument. By the second orbit on the same target, the thermal motions settle down to a significant displacement right after target rise, a possible change later in the orbit due to sun/bright earth/dark earth/ deep space. We will follow these changes for two orbits with each MAMA with internal lamp and the medium dispersion echelle formats in order to obtain a two-dimension series of reference points on the 2-dimensional detector format. Exposures will be done using the 0.1X0.03 aperture and medium resolution echelle gratings, and will have exposure times of 120 seconds for deep, sharp spectral line images. For each orbit, six spectral line images will follow each other, then dark frames are interposed with exposure times extending from 300 seconds to 600 seconds. This provides frequent sampling in the portion of the orbit where thermal flexure is largest, while avoiding excessive lamp use when shifts are expected to be slower. The dark frames will also provide a useful addition to the calibration of the MAMA detector dark current.;
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