NASA's WISE Eye Spies Near-Earth Asteroid

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News release: 2010-028 Jan. 25, 2009

NASA's WISE Eye Spies Near-Earth Asteroid

The full version of this story with accompanying images is at:
http://www.jpl.nasa.gov/news/news.cfm?release=2010-028&cid=release_2010-028

PASADENA, Calif. -- NASA's Wide-field Infrared Survey Explorer, or WISE, has spotted its
first never-before-seen near-Earth asteroid, the first of hundreds it is expected to find during its
mission to map the whole sky in infrared light. There is no danger of the newly discovered
asteroid hitting Earth.

The near-Earth object, designated 2010 AB78, was discovered by WISE Jan. 12. The mission's
sophisticated software picked out the moving object against a background of stationary stars. As
WISE circled Earth, scanning the sky above, it observed the asteroid several times during a
period of one-and-a-half days before the object moved beyond its view. Researchers then used
the University of Hawaii's 2.2-meter (88-inch) visible-light telescope near the summit of Mauna
Kea to follow up and confirm the discovery.

The asteroid is currently about 158 million kilometers (98 million miles) from Earth. It is
estimated to be roughly 1 kilometer (0.6 miles) in diameter and circles the sun in an elliptical orbit
tilted to the plane of our solar system. The object comes as close to the sun as Earth, but because
of its tilted orbit, it will not pass very close to Earth for many centuries. This asteroid does not
pose any foreseeable impact threat to Earth, but scientists will continue to monitor it.

Near-Earth objects are asteroids and comets with orbits that pass relatively close to Earth's path
around the sun. In extremely rare cases of an impact, the objects may cause damage to Earth's
surface. An asteroid about 10 kilometers (6 miles) wide is thought to have plunged into our
planet 65 million years ago, triggering a global disaster and killing off the dinosaurs.

Additional asteroid and comet detections will continue to come from WISE. The observations
will be automatically sent to the clearinghouse for solar system bodies, the Minor Planet Center in
Cambridge, Mass., for comparison against the known catalog of solar system objects. A
community of professional and amateur astronomers will provide follow-up observations,
establishing firm orbits for the previously unseen objects.

"This is just the beginning," said Ned Wright, the mission's principal investigator from UCLA.
"We've got a fire hose of data pouring down from space."

On Jan. 14, the WISE mission began its official survey of the entire sky in infrared light, one
month after it rocketed into a polar orbit around Earth from Vandenberg Air Force Base in
California. By casting a wide net, the mission will catch all sorts of cosmic objects, from
asteroids in our own solar system to galaxies billions of light-years away. Its data will serve as a
cosmic treasure map, pointing astronomers and telescopes, such as NASA's Spitzer Space
Telescope and the upcoming James Webb Space Telescope, to the most interesting finds.

WISE is expected to find about 100,000 previously unknown asteroids in our main asteroid belt,
a rocky ring of debris between the orbits of Mars and Jupiter. It will also spot hundreds of
previously unseen near-Earth objects.

By observing infrared light, WISE will reveal the darkest members of the near-Earth object
population -- those that don't reflect much visible light. The mission will contribute important
information about asteroid and comet sizes. Visible-light estimates of an asteroid's size can be
deceiving, because a small, light-colored space rock can look the same as a big, dark one. In
infrared, however, a big dark rock will give off more of a thermal, or infrared glow, and reveal its
true size. This size information will give researchers a better estimate of how often Earth can
expect potentially devastating impacts.

"We are thrilled to have found our first new near-Earth object," said Amy Mainzer of NASA's
Jet Propulsion Laboratory in Pasadena, Calif. Mainzer is the principal investigator of NEOWISE,
a program to mine the collected WISE data for new solar system objects. "Many programs are
searching for near-Earth objects using visible light, but some asteroids are dark, like pavement,
and don't reflect a lot of sunlight. But like a parking lot, the dark objects heat up and emit
infrared light that WISE can see."

"It is great to receive the first of many anticipated near-Earth object discoveries by the WISE
system," said Don Yeomans, manager of NASA's Near-Earth Object Program Office at JPL.
"Analysis of the WISE data will go a long way toward understanding the true nature of this
population."

JPL manages the WISE mission for NASA's Science Mission Directorate, Washington. The
principal investigator, Edward Wright, is at UCLA. The mission was competitively selected
under NASA's Explorers Program managed by the Goddard Space Flight Center, Greenbelt, Md.
The science instrument was built by the Space Dynamics Laboratory, Logan, Utah, and the
spacecraft was built by Ball Aerospace & Technologies Corp., Boulder, Colo. Science operations
and data processing take place at the Infrared Processing and Analysis Center at the California
Institute of Technology in Pasadena. Caltech manages JPL for NASA. The ground-based
observations are partly supported by the National Science Foundation.

More information is online at http://www.nasa.gov/wise and http://wise.astro.ucla.edu .

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