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Overview

Once you have determined the set of science exposures and any additional target acquisition or calibration exposures you may require for your science program, you are ready to determine the total number of orbits to request. Generally, this is a straightforward exercise involving tallying up the overheads on the individual exposures and on the selected pattern (see Chapter 10), packing the exposure and overhead times into individual orbits, and tallying up the results to determine your total orbit request. This process may need to be iterated, in order to seek the most efficient use of the orbit time.

We refer you to the CP/Phase I Proposal Instructions for information on the Observatory policies and practices with respect to orbit time requests and for the orbit determination work sheets. Below, we provide a summary of the NICMOS specific overheads, and give several examples to illustrate how to calculate your orbit requirements for Phase I Proposals.

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