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takyon writes:

NASA's Osiris-Rex Arriving at Asteroid Bennu After a Two-Year Journey

Launched two years ago, NASA's Osiris-Rex spacecraft arrives at the asteroid Bennu on Monday. Its mission is to survey the asteroid ahead of retrieving pristine bits of the solar system from the rock's surface and then bringing them back to Earth in the years ahead.

[...] Osiris-Rex is pulling in at a modest speed, and the moment of arrival is a somewhat arbitrary designation. The spacecraft started the approach phase of its mission in August when it was 1.2 million miles from Bennu. On Monday, it will be 12 miles away, although still too far away to orbit the asteroid. There should be no drama. It should be just a smooth transition to the next phase of the mission.

Osiris-Rex will make a series of passes over the asteroid at a range of 4.3 miles for an initial survey to better determine its mass, rate of spin and shape. In January, the spacecraft will get closer to Bennu, between 0.9 and 1.2 miles, and be drawn into orbit around the asteroid. It will then spend more than a year performing reconnaissance of Bennu before attempting to bounce off the surface and collect a sample of the asteroid in mid-2020.

OSIRIS-REx and 101955 Bennu.

Previously: New Horizons Spacecraft Approaches 2014 MU69; OSIRIS-REx Nears 101955 Bennu
OSIRIS-REx Approaches Bennu, Sends Photo Captured at a Distance of 330 km

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