81. Asteroid Comet Impact Hazards NASA Ames Research Center brings you reports, a Torino impact hazard scale, the latest news, and an image gallery. http://impact.arc.nasa.gov/

News in Brief News Archive December 21,2007 Tunguska Revision, and a Possible NEA Impact on Mars A proposed downsizing of the energy of the 1908 Tunguska airburst implies an increase in the expected frequency of such impacts. In addition, a possible Mars-impactor has been discovered by the Spaceguard Survey. Read more... November 10,2007 Congressional Hearings on NEO Survey Programs On Thursday, November 8, 2007, the House Committee on Science and Technology's Subcommittee on Space and Aeronautics held a hearing to examine the status of NASA's Near-Earth Object survey program and review the findings and recommendations of NASA's report to Congress. Read more... Related Information Is the Earth targeted for impact? Torino Impact Scale NASA Astrobiology Institute NASA NEO Program Office ... Questions and Comments Curated by Lockheed Martin

82. European Asteroid Research Node Association of European research groups active in asteroid research. Links to member sites and resources useful for asteroid research. http://earn.dlr.de/

Participating Institutes Activities Data Archives Abstracts and Preprints ... Data-base of physical properties of NEOs is updated continuously An on-line data-base of Physical and Dynamical properties NEOs, with the corresponding bibliographical references is available at the EARN site. This data-base, compiled and maintained at DLR by Gerhard Hahn , contains information on all known near-Earth objects (Atens-Apollo-Amor Asteroids), and is updated on a regular basis. It is also linked to, and reachable from the NEO Dynamics Site NEODyS at the University of Pisa, which provides extensive information on all dynamical aspects of NEOs, including close approach predictions and collision probabilities. E.A.R.N. is an informal association of European research groups active in asteroid research. The idea behind this service is to provide a means for easy and fast communication, exchange of data and other information in both observational and theoretical research on asteroids. This service is hosted by the DLR - Institute of Planetary Research, Berlin

83. Asteroid --  Britannica Online Encyclopedia Britannica online encyclopedia article on asteroid any of a host of rocky small bodies, about 1000 km (600 miles) or less in diameter, that orbit the Sun http://www.britannica.com/eb/article-9110155/asteroid

var britAdCategory = "other"; Already a member? LOGIN Encyclopædia Britannica - the Online Encyclopedia Home Blog Advocacy Board ... Free Trial Britannica Online Content Related to this Topic This Article's Table of Contents Introduction Major milestones in asteroid research Early discoveries Later advances Geography of the asteroid belt Names and orbits of asteroids ... Classification of asteroids Physical characteristics of asteroids Rotation and shape Size and albedo Mass and density Composition ... Print this Table of Contents Shopping New! Britannica Book of the Year The Ultimate Review of 2007. 2007 Britannica Encyclopedia Set (32-Volume Set) Revised, updated, and still unrivaled. New! Britannica 2008 Ultimate DVD/CD-ROM The world's premier software reference source. asteroid Page 1 of 19 NASA/JPL/Caltech NASA; illustration by Don Davis also called minor planet or planetoid any of a host of rocky small bodies , about 1,000 km (600 miles) or less in diameter, that orbit the Sun primarily between the orbits of Mars and Jupiter in a nearly flat ring called the asteroid belt. It is because of their small size and large numbers relative to the major planets that asteroids are also called minor planets. The two designations have been used interchangeably, though the term asteroid is more widely recognized by the general public. Among scientists, those who study individual objects with dynamically interesting orbits or groups of objects with similar orbital characteristics generally use the term minor planet, whereas those who study the physical properties of such objects usually refer to them as asteroids. The distinction between asteroids and

84. CNN.com - Giant Asteroid Could Hit Earth In 2014 - Sep. 2, 2003 A giant asteroid is heading for Earth and could hit in 2014, US astronomers have warned British space monitors. http://www.cnn.com/2003/TECH/space/09/02/asteroid.reut/index.html

The Web CNN.com Home Page World U.S. Weather ... Special Reports SERVICES Video E-mail Newsletters CNNtoGO SEARCH Web CNN.com Giant asteroid could hit Earth in 2014 Artist's impression of asteroid over Earth Story Tools RELATED 2003 QQ47: Earth Impact Risk Summary PopSci.com: Will hobbyists save world from killer asteroids? YOUR E-MAIL ALERTS Near Earth Object or Create your own Manage alerts What is this? LONDON, England (Reuters) A giant asteroid is heading for Earth and could hit in 2014, U.S. astronomers have warned British space monitors. But for those fearing Armageddon, don't be alarmed the chances of a catastrophic collision are just one in 909,000. Asteroid "2003 QQ47" will be closely monitored over the next two months. Its potential strike date is March 21, 2014, but astronomers say that any risk of impact is likely to decrease as further data is gathered. On impact, it could have the effect of 20 million Hiroshima atomic bombs, a spokesman for the British government's Near Earth Object Information Centre told BBC radio. The Centre issued the warning about the asteroid after the giant rock was first observed in New Mexico by the Lincoln Near Earth Asteroid Research Program.

85. Erik Asphaug Click the Worlds! asteroid Eros rotating in space a picture of me My Publications Planetary Photojournal Astronomy Picture of the Day http://www.es.ucsc.edu/~asphaug/

Erik Asphaug Professor of Earth and Planetary Sciences Director, CODEP , the IGPP-UCSC Center for the Origin, Dynamics and Evolution of Planets University of California, Santa Cruz Click the Worlds! My Publications Planetary Photojournal Astronomy Picture of the Day Space Daily ... Crooks and Liars

86. Asteroid To Make Rare Close Flyby Of Earth January 29 Jan 25, 2008 Scientists are monitoring the orbit of asteroid 2007 TU24. The asteroid, believed to be between 150 meters (500 feet) and 610 meters (2000 http://www.sciencedaily.com/releases/2008/01/080124192818.htm

Science News Share Blog Cite Print Email Bookmark Asteroid To Make Rare Close Flyby Of Earth January 29 ScienceDaily (Jan. 25, 2008) See also: Asteroids, Comets and Meteors Satellites Astronomy Solar System ... Asteroid belt Asteroid 2007 TU24 was discovered by the NASA-sponsored Catalina Sky Survey on Oct. 11, 2007. Scientists at NASA's Near-Earth Object Program Office at the Jet Propulsion Laboratory in Pasadena, Calif., have determined that there is no possibility of an impact with Earth in the foreseeable future. "This will be the closest approach by a known asteroid of this size or larger until 2027," said Don Yeomans, manager of the Near Earth Object Program Office at JPL. "As its closest approach is about one-and-a-half times the distance of Earth to the moon, there is no reason for concern. On the contrary, Mother Nature is providing us an excellent opportunity to perform scientific observations." Asteroid 2007 TU24 will reach an approximate apparent magnitude 10.3 on Jan. 29-30 before quickly becoming fainter as it moves farther from Earth. On that night, the asteroid will be observable in dark and clear skies through amateur telescopes with apertures of at least 7.6 centimeters (3 inches). An object with a magnitude of 10.3 is about 50 times fainter than an object just visible to the naked eye in a clear, dark sky. NASA detects and tracks asteroids and comets passing close to Earth. The Near Earth Object Observation Program, commonly called "Spaceguard," discovers, characterizes and computes trajectories for these objects to determine if any could be potentially hazardous to our planet.

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