Astronomers used 146 images of the Dwarf Planet Vesta taken by the Wide Field Camera 3 aboard Hubble to get a look at its 5.34 hour rotation. The imaging was done in preparation for the encounter between the DAWN spacecraft and Vesta in July 2011.

The images were taken in the near-ultraviolet and blue light. Hubble can see features about 25 miles (40km) across.

From the press release (more info and image sizes in the link):

The asteroid is somewhat like our moon, with ancient lava beds (the dark patches) and powdery debris, the pulverized remains of impacts (the orange-colored areas). A flattened area on one end of Vesta is a giant impact crater formed by a collision billions of years ago. The crater is 460 kilometers (285 miles) across, close to Vesta’s roughly 530-kilometer (330-mile) diameter. The asteroid is about the size of Arizona.

Image credit: NASA/ESA/STScI/UMd