Near Earth Object Wide-field Survey Explorer (NEOWISE) is a Nasa’s another important spacecraft on mission has released its second year of survey data. The spacecraft has now characterized a total of 439 NEOs since the mission was re-started in December 2013. Of these, 72 were new discoveries.
Near-Earth Objects (NEOs) are the comets and asteroids that have been pulled by the gravitational attraction of planets in our solar system into the orbits that allow them to enter Earth’s neighborhood. Till now eight of the objects discovered in the past year have been classified as Potentially Hazardous Asteroids (PHAs), based on their size and how closely their orbits approach Earth.
When data of its second year release to the public , the NEOWISE spacecraft completed another milestone in its mission to discover, track and characterize the asteroids and comets that approach closest to Earth.
Since the beginning of its survey in December 2013, NEOWISE has measured more than 19,000 asteroids and comets with infrared wavelengths. And more than 5.1 million infrared images of the space were collected in the last year. A new movie, based on the data collected, depicts asteroids and comets observed so far by NEOWISE.
“By studying the distribution of lighter- and darker-colored material, NEOWISE data give us a better understanding of the origins of the NEOs, originating from either different parts of the main asteroid belt between Mars and Jupiter or the icier comet populations,” said James Bauer, the mission’s deputy principal investigator at NASA’s Jet Propulsion Laboratory in Pasadena, California.
Its originally called the “Wide-field Infrared Survey Explorer (WISE),” the spacecraft was launched in December 2009. Then, it was set on hibernation in 2011 after its primary mission was completed. In September 2013, it was activated again, and renamed to NEOWISE and assigned a new mission: to assist NASA’s efforts to identify the population of potentially hazardous near Earth objects. NEOWISE also is characterizing previously known asteroids and comets to provide information about their sizes and compositions.
“NEOWISE discovers large, dark, near-Earth objects, complementing our network of ground-based telescopes operating at visible-light wavelengths. On average, these objects are many hundreds of meters across,” said Amy Mainzer of JPL, NEOWISE principal investigator. NEOWISE has discovered 250 new objects since its restart, including 72 near-Earth objects and four new comets.
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