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Wide-field Infrared Survey Explorer
Wide-field Infrared Survey Explorer (WISE) is a NASA infrared-wavelength astronomical space telescope launched in December 2009, and placed in hibernation in February 2011 when its transmitter turned off.〔(【引用サイトリンク】title=Wide-field Infrared Survey Explorer )〕 It was re-activated in 2013.〔 Its observations supported the discovery of the first Y Dwarf and Earth trojan asteroid, tens of thousands of new asteroids, and numerous previously undiscovered star clusters.〔〔(【引用サイトリンク】title=Berkeley – NASA's WISE Finds Earth's First Trojan Asteroid (July 27, 2011) )〕〔(【引用サイトリンク】title=WISE Public Web Site – UCLA )〕〔
WISE performed an all-sky astronomical survey with images in 3.4, 4.6, 12 and 22 μm wavelength range bands, over ten months using a diameter infrared telescope in Earth orbit.〔(【引用サイトリンク】title=Wide-field Infrared Survey Explorer (WISE) )〕 After its hydrogen coolant depleted, a four-month mission extension called NEOWISE was conducted to search for near-Earth objects such as comets and asteroids using its remaining capability.〔
The All-Sky data including processed images, source catalogs and raw data, was released to the public on March 14, 2012, and is available at the Infrared Science Archive.〔(【引用サイトリンク】title=WISE All-Sky Data Release )〕〔(【引用サイトリンク】title=NASA Releases New WISE Mission Catalog of Entire Infrared Sky )〕〔(【引用サイトリンク】title=The Wide-field Infrared Survey Explorer All-Sky Data Release March 14, 2012 )〕 In August 2013, NASA announced it would reactivate the WISE telescope for a new three-year mission to search for asteroids that could collide with Earth. Science operations and data processing for WISE and NEOWISE take place at the Infrared Processing and Analysis Center at the California Institute of Technology in Pasadena.
== Mission goals ==
The mission was planned to create infrared images of 99 percent of the sky, with at least eight images made of each position on the sky in order to increase accuracy. The spacecraft was placed in a , circular, polar, Sun-synchronous orbit for its ten-month mission, during which it has taken 1.5 million images, one every 11 seconds. The satellite orbited above the terminator, its telescope pointing always to the opposite direction to the Earth, except for pointing towards the Moon, which was avoided, and its solar cells towards the Sun. Each image covers a 47-arcminute field of view, which means a 6-arcsecond resolution. Each area of the sky was scanned at least 10 times at the equator; the poles were scanned at theoretically every revolution due to the overlapping of the images.〔(【引用サイトリンク】title=Posting on Minor Planet Mailing List by Amy Mainzer, principal investigator (WISE NEO Section) )〕 The produced image library contains data on the local Solar System, the Milky Way, and the more distant universe. Among the objects WISE studied are asteroids, cool, dim stars such as brown dwarfs, and the most luminous infrared galaxies.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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