|FGS Instrument Handbook|
The FGS is suitable for the observation of solar system objects in both Position and Transfer modes. The technique to acquire the data is not as straightforward as standard HST moving target observations, but in cases where the target is not moving too rapidly, the observation is certainly feasible. We note that the FGS has been used in previous Cycles to observe Main Belt asteroids, both in Position mode and in Transfer mode. More detail on moving target observations can be found in Chapter 4.