near-Earth asteroid


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near-Earth asteroid

(NEA) Any asteroid that has a chance of hitting our planet, specifically any member of the Apollo, Amor, and Aten groups. Although the annual probability of the Earth being struck by a large asteroid or comet is extremely small, the consequences of such a collision are so catastrophic that it was thought prudent in the USA to assess the nature of the threat and to be prepared to deal with it.
References in periodicals archive ?
It's One Of The Third Largest Near-Earth Asteroids
The inner moon, some 180 to 240 m (600 to 800 feet) across, takes roughly 7 to 8 hours to complete an orbit--the shortest orbital period for any of the 60 near-Earth asteroids known to have companions.
NASA has identified more than 12,000 NEOs to date, including 96 percent of near-Earth asteroids larger than 0.
Trajectories and explosive surface impacts are also shown for a more typical near-Earth asteroid, named Castalia.
NASA announced Friday that its OSIRIS-Rex spacecraft - bound for the near-Earth asteroid Bennu - had successfully scanned part of its surrounding space for Earth-Trojan asteroids.
NASA's Near-Earth Asteroid Tracking discovered the space rock on Boxing Day.
The object, with a diameter of 5 to 10 miles, may be an unusual asteroid or a dead comet stripped of all volatile material, said Steve Pravdo, project task manager for the Near-Earth Asteroid Tracking program at JPL.
Besides low-cost Earth-orbiting missions such as CHIPSat, now under development by SpaceDev for the University of California at Berkeley, SpaceDev is offering lunar orbiters, Mars probe carriers and near-Earth asteroid missions for sale as turn-key commercial products.
NASA's asteroid-sampling spacecraft - Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer, or OSIRIS-REx for short - is set to take off from Earth on Thursday evening for its date with Bennu, a near-Earth asteroid.
Using very precise ground-based observations, Stephen Lowry (University of Kent, UK) and colleagues have measured the speed at which the near-Earth asteroid (25143) Itokawa spins and how that spin rate is changing over time.
It was the fifth previously unknown asteroid that JPL's Near-Earth Asteroid Tracking system has discovered since its monthly observations began March 15.
The Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer will travel to the near-Earth asteroid Bennu with the aim of mapping its surface and identifying, collecting and returning pristine samples of high science value.