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HST Call for Proposals and HST Primer for Cycle 24 |
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Objects within the Solar System move with respect to the fixed stars. HST has the capability to point at, and track moving targets, including planets, their satellites and surface features on them, with sub-arcsecond accuracy. However, there are a variety of practical limitations on the use of these capabilities that must be considered before addressing the feasibility of any particular investigation. Proposals to observe the Moon, for example, will be permitted in Cycle 23. Please consult the Lunar Observations User Information Report (UIR-2007-01) for more information.The track for a moving target is derived from its orbital elements. Orbital elements for all planets and their satellites are available at STScI. For other objects, the Principal Investigator (PI) must provide orbital elements for the target in the Phase II proposal. The “Requires Ephemeris Correction” special requirement, described in the Phase II Proposal Instructions can be used to insert an offset shortly before the observation is executed to eliminate “zeropoint” errors due to an inaccurate ephemeris. See Section 4.1.4 of the Call for Proposals for restrictions on observations of Solar System targets.