Chapter 5: Observing Considerations 5.1 Bright-Object Constraints 5.1.1 ACS, COS & STIS 5.1.2 FGS 5.1.3 WFC3 5.2 Target Acquisitions 5.2.1 Target Acquisition without the Ground System 5.2.2 Target Acquisition with Ground System Support 5.3 Solar System Targets 5.4 Offsets, Patterns, and Dithering 5.5 Spatial Scans