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NASA's Asteroid Hunter Spacecraft Returns First Images after Reactivation PDF Print E-mail
Written by San Fernando Valley Sun   
Thursday, 26 December 2013 19:15

NASA's Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE), a spacecraft that made the most comprehensive survey to date of asteroids and comets, has returned its first set of test images in preparation for a renewed mission.

NEOWISE discovered more than 34,000 asteroids and characterized 158,000 throughout the solar system during its prime mission in 2010 and early 2011. It was reactivated in September following 31 months in hibernation, to assist NASA's efforts to identify the population of potentially hazardous near-Earth objects (NEOs). NEOWISE also can assist in characterizing previously detected asteroids that could be considered potential targets for future exploration missions.

"NEOWISE not only gives us a better understanding of the asteroids and comets we study directly, but it will help us refine our concepts and mission operation plans for future, space-based near-Earth object cataloging missions," said Amy Mainzer, principal investigator for NEOWISE at NASA's Jet Propulsion Laboratory in Pasadena, Calif.

"The spacecraft is in excellent health, and the new images look just as good as they were before hibernation. Over the next weeks and months we will, be gearing up our ground-based data processing and expect to get back into the asteroid, hunting business, and acquire our first previously undiscovered space rock, in the next few months."

Some of the deep-space images taken by the spacecraft include a previously detected asteroid named (872) Holda. With a diameter of 26 miles (42 kilometers), this asteroid orbits the sun between Mars and Jupiter in a region astronomers call the asteroid belt. The images tell researchers the quality of the spacecraft's observations is the same as during its primary mission.

NEOWISE's Next Light

The spacecraft uses a 16-inch(40-centimeter) telescope and infrared cameras to seek out and discover unknown NEOs and characterize their size, albedo or reflectivity, and thermal properties. Asteroids reflect, but do not emit visible light, so data collected with optical telescopes using visible light can be deceiving.

Infrared sensors, similar to the cameras on NEOWISE, are a powerful tool for discovering, cataloging and understanding the asteroid population. Some of the objects about which NEOWISE will be collecting data could become candidates for the agency's announced asteroid initiative.

NASA's initiative will be the first mission to identify, capture and relocate an asteroid. It represents an unprecedented technological feat that will lead to new scientific discoveries and technological capabilities that will help protect our home planet. The asteroid initiative brings together the best of NASA's science, technology and human exploration efforts to achieve President Obama's goal of sending humans to an asteroid by 2025.

"It is important that we accumulate as much of this type of data as possible while the spacecraft remains a viable asset," said Lindley Johnson, NASA's NEOWISE program executive in Washington.

NASA's NEOWISE spacecraft opened its "eyes" after more than two years of slumber to see the starry sky with the same
clarity achieved during its prime mission. This image of a patch of sky in the constellation Pisces is among the first taken
by the revived spacecraft's infrared cameras, and shows the ultimate target: asteroids. Appearing as a string of red dots,
an asteroid can be seen in a series of exposures captured by the spacecraft.
The rocky body belongs to our solar system's main belt, a band of asteroids that orbits between Mars and Jupiter. NEOWISE
is on the lookout for both main belt asteroids such as these, and especially for near-Earth objects (NEOs), which
include asteroids and comets that pass relatively close to Earth.
The asteroid is called Holda, or 872, and was discovered in 1917.
The faint red streak in the image is an Earth-orbiting satellite passing above the NEOWISE spacecraft.
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