mercredi 29 juillet 2015

How Sunlight Pushes Asteroids











NASA - OSIRIS-REx Mission logo.

July 29, 2015

Rotating asteroids have a tough time sticking to their orbits. Their surfaces heat up during the day and cool down at night, giving off radiation that can act as a sort of mini-thruster.

video
How Sunlight Pushes Asteroids

This force, called the Yarkovsky effect, can cause rotating asteroids to drift widely over time, making it hard for scientists to predict their long-term risk to Earth.

Artist's impression of OSIRIS-REx arrival to asteroid Bennu

To learn more about the Yarkovsky effect, NASA is sending a spacecraft called OSIRIS-REx to the near-Earth asteroid Bennu. OSIRIS-REx will observe how Bennu’s shape, brightness, and surface features influence the strength of the Yarkovsky effect, helping scientists to better predict Bennu’s orbit over time and pin down its long-term risk.

Learn more about NASA’s OSIRIS-REx mission to asteroid Bennu: http://www.nasa.gov/osiris-rex

Visit the University of Arizona’s OSIRIS-REx website: http://www.asteroidmission.org/

Image, Video, Text, Credit: NASA Goddard Space Flight Center.

Greetings, Orbiter.ch

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