Reservations will be activated for the telescope by users once the wide-field camera is operational.

This required better wide-field cameras than were available, and was discarded.

The first wide-field camera pointed towards Polaris and gave a coarse orientation up to 15 arcminutes.

Previous Hubble images of Vesta's southern hemisphere were taken in 1994 and 1996 with the wide-field camera.

The rules for wide-field camera specified an older, less promising technology.

"The images were at least twice, if not three times, better than expected," said James Westphal, the principal scientist for the wide-field camera that was tested.

On the sixth and seventh days, they are to install the wide-field planetary camera and then Costar.

More tests will be conducted in the next few weeks, but regular observations with the wide-field camera are expected to begin by the end of the month.

According to present plans, the wide-field camera will be replaced by a space-shuttle mission in 1993.

The telescope's wide-field electronic camera should encompass an area in the sky 36 times that of the full moon.