Ossiris-REx begins preliminary survey phase ahead of orbital insertion

NASA’s OSIRIS-REx spacecraft after a 2 billion km journey, has reached and is now in orbit around asteroid Bennu.   See previous post.

Below is a series of images taken by OSIRIS-REx at a distance of about 80 km (50 mi.) The images constitute one full revolution of the asteroid.

The spacecraft is now in the Preliminary Survey Phase which began on December 3, 2018, and marks the first time that the OSIRIS-REx spacecraft will operate around the asteroid. The spacecraft will make a total of five passes over the north pole, equator, and south pole at a range of 4.3 miles (7 km). The primary science goals of Preliminary Survey are to estimate Bennu’s mass, refine the asteroid’s spin state model, and generate a global shape model at a resolution of 75-cm.  With this information orbital insertion can be planned and detailed (and close) survey of the asteroid can begin.