To allow automatic tracking of celestial objects, Celestron offers several motor drives. All models include a hand controller, which makes observing more fun as it makes centering objects much easier. In addition, the hand controller can be used as a drive corrector for long exposure celestial photography.

These dual axis motor drives, with drive corrector capabilities, are designed for Celestron's CG-4 and CG-5 mounts. They precisely control the telescope's tracking speed during long, timed exposures of celestial objects, producing the best possible image sharpness. Precision drive correctors are a must for those with a serious interest in astrophotography or CCD imaging. Four speeds are available—1x (sidereal), 2x for guiding, 4x, and 8x for centering. 
These precision, state-of-the-art DC motor drives operate from 4 D-cell batteries (not included). The hand controller module is very compact and fits easily in the palm of your hand. Motors for both axes are included, along with brackets, clutches and hardware.

Dual Axis Motor Drives for CG-4 mounts  [93522]
Dual Axis Motor Drives for CG-5 mounts  [93523]