AP Photo/NASA/JPL-Caltech/UCLA/MPS/DLR/IDA This Feb. 19, 2015 image shows the swarf planet Ceres provided by NASA, taken by the agency's Dawn spacecraft from a distance of nearly 29,000 miles (46,000 kilometers). It shows that the brightest spot on Ceres has a dimmer companion, which apparently lies in the same basin, seen at center of the image. Dawn is preparing to rendezvous with the largest object in the asteroid belt located between Mars and Jupiter, scheduled to go into orbit Friday, March 7 after a three-year journey. Dawn is about 590 miles (950 kilometers) in diameter.

PASADENA, Calif. A NASA spacecraft is preparing to rendezvous with the largest object in the asteroid belt located between Mars and Jupiter.

The Dawn craft is on target to slip into orbit around the dwarf planet Ceres on Friday after a three-year journey. It'll be the second stop for Dawn, which earlier visited the asteroid Vesta.

Dawn has been snapping pictures of Ceres as it nears the Texas-sized object. Sharper images are expected in the coming months as Dawn spirals closer to Ceres' surface.

Launched in 2007 and powered by ion propulsion, Dawn is the first craft to target two space rocks to learn about the solar system's evolution.

Dawn studied Vesta, the second massive object in the asteroid belt, from 2011 to 2012 and beamed back more than 30,000 images.

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NASA spacecraft nearing its second stop dwarf planet Ceres