As an example, Table 6.12
shows the layout of a visit with two orbits of spectroscopic observations that require a target acquisition, but no SAMs and no special calibration observations. For simplicity, overheads are shown to occur after each exposure; in reality, some overheads occur before an exposure (e.g., a filter change) while others appear afterwards (e.g., readout time).
More detailed examples for each of the SIs are given in Appendix A:Orbit Calculation Examples
. Those examples are for common, simple uses of the instruments. For more complex examples and observing strategies, please consult the HST Instrument Handbooks
(see Section 1.3
For a program with coordinated parallel observations (see Section 4.2.1 of the Call for Proposals
), laying out the parallel observations into orbits and visits is fairly straightforward. The primary observations determine the orbit and visit structure, and the coordinated parallels should conform to the visit structure of the primary observations.