Position of individual Guide Star
Positions for a given Guide Star or list of Guide Stars may be
rgsc can search a box centered at a given right ascension and
declination with given with given dimensions.
Region search with added limits
In addition to positional limits, selection can be limited by magnitude,
object type, or plate type.
Batch search from input catalog
By specifying a catalog as input on the command line rgsc will
search for Guide Stars in fields centered on each of the catalog