OSIRIS-REx Captures First Glimpse Of Asteroid Bennu

After an almost two-year journey through space, NASA’s asteroid sampling spacecraft, OSIRIS-REx, caught its first glimpse of asteroid Bennu last week and began the final approach toward its target. On Aug. 17, the spacecraft’s PolyCam camera obtained the image from a distance of 1.4 million miles.

Led by the University of Arizona’s Lunar and Planetary Laboratory, OSIRIS-REx is NASA’s first mission to visit a near-Earth asteroid, survey the surface, collect a sample and deliver it safely back to Earth. The spacecraft has traveled approximately 1.1 billion miles since its Sept. 8, 2016 launch, and is scheduled to arrive at Bennu on Dec. 3.

“Now that OSIRIS-REx is close enough to observe Bennu, the mission team will spend the next few months learning as much as possible about Bennu’s size, shape, surface features and surroundings before the spacecraft arrives at the asteroid,” said Dante Lauretta, OSIRIS-REx principal investigator and professor of planetary science at the UA. “After spending so long planning for this moment, I can’t wait to see what Bennu reveals to us.”

To boost itself onto Bennu’s orbital plane, OSIRIS-REx performed a slingshot maneuver, or gravity assist, around Earth 11 months ago. The craft is now zipping along at almost 32,000 mph relative to Earth, while catching up with Bennu at a little over 1,200 mph relative to the asteroid. The image was acquired using PolyCam, one of three cameras, all developed at the UA, that together comprise the OSIRIS-REx Camera Suite, OCAMS for short.

As OSIRIS-REx approaches the asteroid, the spacecraft will use its science instruments to gather information about Bennu and prepare for arrival. In addition to the OCAMS camera suite, the spacecraft’s science payload includes the OTES thermal spectrometer, the OVIRS visible and infrared spectrometer, the OLA laser altimeter and the REXIS X-ray spectrometer.

During the mission’s approach phase, OSIRIS-REx will:
* Regularly observe the area around the asteroid to search for dust plumes and natural satellites, and study Bennu’s light and spectral properties
* Execute a series of four asteroid approach maneuvers, beginning on Oct. 1, slowing the spacecraft to match Bennu’s speed and trajectory
* Jettison the protective cover of the spacecraft’s sampling arm in mid-October and subsequently extend and image the arm for the first time in flight
* Use OCAMS to reveal the asteroid’s overall shape in late October and begin detecting Bennu’s surface features in mid-November.

After arrival at Bennu, the spacecraft will spend the first 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.

“Bennu’s low gravity provides a unique challenge for the mission,” said Rich Burns, OSIRIS-REx project manager at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “At roughly 0.3 mile in diameter, Bennu will be the smallest object that any spacecraft has ever orbited.”

The spacecraft will extensively survey the asteroid before the mission team identifies two possible sample sites. Sample collection is scheduled for early July 2020, and the spacecraft will head back toward Earth before ejecting the Sample Return Capsule for landing in the Utah desert in September 2023.


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