Lincoln Near-Earth Asteroid Research |
The Lincoln Near-Earth Asteroid Research (LINEAR) project is a cooperative project between
the United States Air Force, NASA and MIT's Lincoln Laboratory for the
systematic discovery of near-Earth asteroids. LINEAR is responsible for the
majority of asteroid detections since 1998. As of February 26, 2004 LINEAR had detected 198,450 new objects of which at least 1404 were near earth asteroids and 128 were comets.
It began operating a near-Earth object (NEO) discovery
facility using a one-meter aperture GEODSS telescope in 1996. GEODSS stands for
Ground-based Electro-Optical Deep Space Surveillance and these wide
field Air Force telescopes were designed to optically observe Earth orbital spacecraft. The GEODSS instruments used by the LINEAR
program are located at the Lincoln Laboratory's experimental test site in the White Sands Missile Range at Socorro, New Mexico. Data is then sent to the Lincoln Laboratory at Hanscom Air Force
Base in Lexington, Massachusetts.
Between March and July 1997, a 1024 × 1024 CCD pixel detector was used in field tests and, while this CCD detector filled only about one fifth of the telescope's
field of view, four NEOs were discovered. In October 1997, a large format
CCD (1960 × 2560 pixels) that covered the telescope's 2 square degree field of view was employed successfully to discover a total of 9 new NEOs. Five more NEOs
were added in the November 1997 through January 1998 interval when both the small and large format CCD detectors were
employed.
Beginning in October 1999, a second one-meter telescope was added to the search effort. In 2002, a third telescope of 0.5
meter aperature was brought on-line to provide follow-up observations for the discoveries made by the two 1-meter search
telescopes. Currently, LINEAR telescopes observe each patch of sky 5 times in one evening with most of the efforts going into
searching along the ecliptic plane where most NEOs would be expected. The sensitivity of their CCDs, and particularly their
relatively rapid read out rates, allows LINEAR to cover large areas of sky each night. Currently, the LINEAR program is
responsible for the majority of NEO discoveries.
The project's principal investigator is Grant Stokes, with co-investigators Jenifer Evans and Eric Pearce.
In addition to discovering tens of thousands of asteroids, LINEAR is also credited with the discovery or rediscovery or
co-discovery of several periodic comets, including 11P/Tempel-Swift-LINEAR, 146P/Shoemaker-LINEAR,
148P/Anderson-LINEAR, 156P/Russell-LINEAR, 158P/Kowal-LINEAR.
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