|Space Telescope Science Institute|
|HST Call for Proposals and Primer|
A.4 STIS ExampleSTIS is used to observe a target at a declination of +15° degrees according to an observing strategy outlined in Table A.13.
• Therefore, a preliminary observing strategy can be created by the user to fit the observations in two orbits, as shown in Table A.15.Table A.13: STIS Example: Planned Exposures
Table A.14: STIS Example: Incurred Overheads1
Table A.15: STIS Example: Orbit Planning
These overheads are for budgeting purposes. The actual overhead incurred depends upon the particular spectral element selected since the overhead to move the grating is position-dependent and the time for an auto-wavecal is mode-dependent. Additional efficiencies, such as executing auto-wavecals during guide star re-acquisitions or occultation, that may be realized from fine-tuning of the actual exposures (but cannot be assumed a priori), are not included.