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Space Telescope Science Institute |
Cycle 21 Phase II Proposal Instructions |
help@stsci.edu |
Note that many of the Optional Parameters have default values; in such cases, an entry for an Optional Parameter in the Visit and Exposure Specifications is necessary only if it is desired to override the default value. In the STScI proposal system, the physical units of Optional Parameter quantities are always implicit and should never be entered by the observer.STIS has a large number of apertures. A complete list of supported apertures is provided at the end of this chapter (see Table 9.5 on page 180). That table should be taken as definitive if any additional information in this chapter appears to conflict.Table 9.1 lists the permitted Instrument Configurations, Operating Modes, Spectral Elements, and Optional Parameters for the STIS.See the STIS Instrument Handbook for more information.
Some STIS modes will work without an initial ACQuisition (such as slitless spectroscopy and imaging), but in general the user must ensure that ACQuisitions are included where needed. An ACQ/PEAK should always be preceded by an ACQuisition.
The following sections provide further details of the entries to be made on the Visit and Exposure Specifications when a particular STIS/CCD, STIS/FUV–MAMA, or STIS/NUV–MAMA Mode/Configuration is chosen.Note: The AXIS1 and AXIS2 coordinate system is defined in Section 3.1 of the STIS Instrument Handbook. Array sizes are given as AXIS1 x AXIS2. For CCD and MAMA first-order grating and MAMA echelle spectroscopic modes, AXIS1 is in the dispersion direction, and AXIS2 is in the "cross-dispersion" (or spatial) direction.