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| Space Telescope Science Institute |
| Cycle 19 Phase II Proposal Instructions |
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Acquiring an astronomical target and keeping it fixed in an aperture is the heart of observing with HST. Properly specifying target coordinates and motions is essential, of course, as is finding and acquiring suitable guide stars. Earlier chapters in this document have provided detailed instructions on how to specify coordinates and acquisitions for both fixed and moving targets; see Chapter 3: Fixed and Generic Targets on page 25 and Chapter 4: Solar System Targets on page 59.
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