Washington, D.C. – It’s like deja vu. Another asteroid is paying a visit to the Earth-Moon system.
Asteroids have been a hot topic since February 15th when one small asteroid exploded over Russia and another larger one, 2012 DA14, made a record setting close approach to Earth on the same day. This time the interloper is 1998 QE2, a potentially hazardous asteroid 2.7 km in diameter. Astronomers are preparing to study the space rock as it harmlessly passes by on May 31st.
“As my old friend, radar astronomer Steve Ostro used to say, spaceship Earth is making a flyby of the asteroid, so we’re going to exploit the capabilities of the radars to understand as much as possible.”
At closest approach on May 31st, the asteroid will be 5.8 million kilometers from Earth, about 15 times farther than the Moon.
“At that range, both the Goldstone and Arecibo radars should be able to make detailed images of 1998 QE2,” says Benner. “The radar maps should rival images of other asteroids obtained by spacecraft during flyby missions.”
One thing that intrigues Benner is the asteroid’s dark complexion. According to measurements by the Spitzer Space Telescope, 1998 QE2 reflects only 6% of the sunlight that falls on it, which makes it blacker than coal. “Consequently, it could have a composition similar to that of 101955 Bennu, the target of NASA’s OSIRIS-REx mission,” he says.
Due to launch in 2016, the OSIRIS-REx spacecraft will travel to near-Earth asteroid Bennu, study it from orbit, and ultimately bring back a sample for laboratory study on Earth. Near-Earth asteroid Bennu interests researchers for two reasons:
First, it is a carbon-rich asteroid that could harbor amino acids and other organic molecules essential to primitive life.
Second, it’s the kind of asteroid that NASA ultimately might want to capture. Indeed, the OSIRIS-REx mission is considered to be a vital part of NASA’s plans to find, study and relocate an asteroid for exploration by astronauts.
Perhaps 1998 QE2 will give researchers a sneak preview of this fascinating space rock.
While amateur astronomers watch the space rock glide through the constellations Libra and Ophiuchus, NASA radars will be pinging the space rock with powerful bursts of radio energy, revealing an alien landscape that no one has ever seen before.
Stay tuned for updates.
More information about asteroids and near-Earth objects is available at: http://neo.jpl.nasa.gov/ , http://www.jpl.nasa.gov/asteroidwatch and via Twitter at http://www.twitter.com/asteroidwatch .
More information about asteroid radar research is at: http://echo.jpl.nasa.gov/
Written by Dr. Tony Phillips
Science at NASA
