Space Telescope Science Institute
Cycle 20 Phase II Proposal Instructions
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HST Phase II Proposal Instructions for Cycle 20 > Chapter 4: Solar System Targets > 4.1 Target Number [Target_Number]

4.1 Target Number [Target_Number]
Each target must have a unique target number (base 10 from 1 to 999) and are usually assigned by the APT software. Target numbers must be positive, monotonically increasing integers. You should define a different target whenever a different target position or timing description is required. For example, separate targets should be defined if you plan to take spectra of several different surface features on a planet, or if you plan to observe the same feature with different timing constraints.

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