Some WFPC2 programs have critical target positioning constraints (i.e. the target must be as close as possible to a specified aperture). A sure way to meet such requirements is to include an interactive acquisition. However, INT ACQs are costly in terms of allotted orbits. A variation of the Reuse Target Offset (RTO) capability can be used to acquire and position a target in the WFPC2 FOV. However, the user must request an additional orbit for the acquisition. The first orbit is used for the acquisition and the second orbit for the science observations.
|
Space Telescope Science Institute http://www.stsci.edu Voice: (410) 338-1082 help@stsci.edu |