None
1,2. Target coordinates should be J2000 and in sexagesimal format.
3. UKIRT = JHK observations of faint standard stars in the Mauna Kea,
Observatories NIR photometric system, Leggett et al., 2006, MNRAS, in press.
Persson = A New System of Faint NIR Standard Stars, Persson, et al., 1998, AJ, 116, 2475.
4. If exposure time > 0, return two sets of standards, one for before and one for after the science target.
5. Maximum distance for acceptable standards.