OSIRIS- Rex and Bennu - Seeker's Thoughts

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OSIRIS- Rex and Bennu

OSIRIS-Rex is the first-ever US mission designed to visit an asteroid and return a sample of its dust back to Earth. OSIRIS-Rex stands for Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer.

OSIRIS-Rex is the third mission in NASA’s New Frontiers program, which previously sent the New Horizons spacecraft zooming by Pluto and the Juno spacecraft into orbit around Jupiter.

Orbiting Bennu
Bennu is an asteroid. Bennu was selected for a the OSIRIS-Rex mission from over 500,000 known asteroids, due to it fitting a number of key criteria.
The criteria included – proximity to the Earth, size, composition etc. 

Proximity to Earth: In order for OSIRIS-Rex to reach its destination in a reasonable timeframe, NASA needed to find an asteroid which had a similar orbit to Earth.
Size: Bennu is around 500m in diameter, so rotates slowly enough to ensure that the regolith stays on its surface. Regolith meant the layer of unconsolidated solid material covering the bedrock of a planet. Smaller asteroid spin faster.
Composition: Bennu is a primitive asteroid, meaning it hasn’t significantly changed since the beginning of the Solar System (over 4 billion years ago). It is also very carbon-rich, meaning it may contain organic molecules, which could have been precursors to life on Earth.
Additionally, Bennu is of interest as it is a Potentially Hazardous Asteroid (PHA). Every 6 years, Bennu’s orbit brings it within 200,000 miles of the Earth, which means it has a high probability of impacting Earth in the late 22nd Century.

The unmanned Spaceship
The $800 million (roughly Rs. 5,600 crores) unmanned spaceship launched two years ago from Cape Canaveral, Florida and arrived December 3 at its destination, some 70 million miles (110 million kilometers) away.

The plan is for OSIRIS-Rex to orbit Bennu through mid-February, using a suite of five scientific instruments to map the asteroid in high resolution to help scientists decide precisely where to sample from.
It was launched in September 2016, and it will reach in 2020. It will use its robotic arm and touch the asteroid in a maneuver Rich Kuhns, OSIRIS-Rex program manager with Lockheed Martin Space Systems in Denver, described as a “gentle high-five.”
Using a circular device much like a car’s air filter, and a reverse vacuum to stir up and collect dust, the device aims to grab about two ounces (60 grams) of material from the asteroid’s surface, and return it to Earth in 2023.