OSIRIS-REx Has Arrived at Asteroid Bennu

University of Arizona News

TUCSON, Ariz. — NASA’s OSIRIS-REx spacecraft arrived at its destination, asteroid Bennu, Dec. 3. Led by the University of Arizona, the OSIRIS-REx mission is the first NASA mission to visit a near-Earth asteroid, survey the surface, collect a sample and deliver it safely back to Earth.

The composition of the asteroid, Bennu, could shed more light on the origins of the solar system.


Initial data from the approach phase show this object to have exceptional scientific value. We can’t wait to get to work studying and characterizing Bennu’s rough and rugged surface to find out where the right spot is to collect the sample and bring it back to Earth,” Principal Investigator Dante Lauretta said. “Today has been very exciting, but the true nail-biting moment will be the sample collection. The best times are ahead of us, so stay tuned. The exploration of Bennu has just begun, and we have a lifetime of adventure ahead of us.”


OSIRIS-REx will spend the next month performing flybys of Bennu’s north pole, equator and south pole, at distances ranging between 11.8 and 4.4 miles from the asteroid. These maneuvers will allow for the first direct measurement of Bennu’s mass, as well as close-up observations of the surface. These trajectories will also provide the mission’s navigation team with experience navigating near the asteroid.

The spacecraft will then spend the next 18 months extensively surveying the asteroid before the mission team identifies two possible sample sites. The spacecraft will study the asteroid with various instruments, providing mission scientists with a wealth of data about the asteroid’s exact shape, chemical composition and physical properties influencing how it is affected by the sun and the surrounding space.

Sample collection is scheduled for July 2020, when OSIRIS-REx will ultimately touch the surface for five seconds to gather a sample of the asteroid. The spacecraft will head back toward Earth before ejecting the Sample Return Capsule for landing in the Utah desert Sept. 24, 2023.


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    • joetv, Here is the information I was able to find:
      Power: Two solar arrays generate 1226–3000 watts, depending on the spacecraft’s distance from the Sun. Energy is stored in Li-ion batteries.[2]
      Propulsion system: Based on a hydrazine monopropellant system developed for the Mars Reconnaissance Orbiter, carrying 1,230 kg (2,710 lb) of propellant and helium.[34]
      The Sample-Return Capsule (SRC) will re-enter the Earth’s atmosphere for a parachute assisted landing. The capsule with encased samples will be retrieved from Earth’s surface and studied, as was done with the Stardust mission.

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