Spacewatch

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Number of NEOs detected by various projects.

Spacewatch is a project at the University of Arizona as of 2011^[update] led by Robert S. McMillan that specializes in the study of minor planets, including various types of asteroids and comets. It was founded in 1980 by Tom Gehrels and McMillan.^[1]

[edit] Notable discoveries

The project also recovered 719 Albert, a long-lost asteroid.

Geology

Lists	Worldwide Africa Antarctica Asia Australia Europe North America South America by country

Confirmed ≥20 km diameter	Acraman Amelia Creek Araguainha Beaverhead Boltysh Carswell Charlevoix Chesapeake Bay Chicxulub Clearwater East & West Gosses Bluff Haughton Kamensk Kara Karakul Keurusselkä Lappajärvi Logancha Manicouagan Manson Mistastin Mjølnir Montagnais Morokweng Nördlinger Ries Obolon' Popigai Presqu'île Puchezh-Katunki Rochechouart Saint Martin Shoemaker Siljan Ring Slate Islands Steen River Strangways Sudbury Tookoonooka Vredefort Woodleigh Yarrabubba

Topics	Alvarez hypothesis breccia coesite complex crater cryptoexplosion ejecta blanket impact crater impact structure impactite Cretaceous–Paleogene boundary Late Heavy Bombardment lechatelierite meteorite moldavite planar deformation features shatter cone shock metamorphism shocked quartz stishovite suevite tektite

Research	Baldwin, Ralph Belknap Barringer, Daniel Barringer Medal Chao, Edward C T Dietz, Robert S Earth Impact Database Hartmann, William K Impact Field Studies Group Lunar and Planetary Institute Melosh, H Jay Ryder, Graham Schultz, Peter H Shoemaker, Eugene Traces of Catastrophe book

Astronomy

Observation	Catalina Sky Survey Earth-crosser asteroid impact event LINEAR LONEOS meteoroid Meteoritical Society NASA NEAT Near-Earth Object (NEO) NEOSSat Orbit@home Palermo Scale Pan-STARRS planetary science potentially hazardous object Sentry Spacewatch Torino Scale WISE

Defense	Asteroid-impact avoidance B612 Foundation Gravity tractor Ion Beam Shepherd NEOShield Spaceguard

Potential threats	99942 Apophis 1950 DA 1999 RQ36 2004 VD17 2007 VK184 2011 AG5

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