منابع مشابه
Near-Earth Asteroid Search Programs
The discovery of the potentially hazardous near-Earth asteroid (NEA) component of the minor-planet population has been enhanced by better detecting and computing technology. A government mandate to quantify the terrestrial impact hazard and to detect 90% of all NEAs larger than 1 km can be realistically addressed. The characteristics, capabilities, and strategies of the major search programs il...
متن کاملNear Earth Asteroid Rendezvous: Mission Summary
On February 14, 2000, the Near Earth Asteroid Rendezvous spacecraft (NEAR Shoemaker) began the first orbital study of an asteroid, the near-Earth object 433 Eros. Almost a year later, on February 12, 2001, NEAR Shoemaker completed its mission by landing on the asteroid and acquiring data from its surface. NEAR Shoemaker’s intensive study has found an average density of 2.67 ± 0.03, almost unifo...
متن کاملThe hazard of near-Earth asteroid impacts on earth
Near-Earth asteroids (NEAs) have struck the Earth throughout its existence. During epochs when life was gaining a foothold f 4 Ga, the impact rate was thousands of times what it is today. Even during the Phanerozoic, the numbers of NEAs guarantee that there were other impacts, possibly larger than the Chicxulub event, which was responsible for the Cretaceous–Tertiary extinctions. Astronomers ha...
متن کاملComet/asteroid Protection System (caps): a Space-based System Concept for Revolutionizing Earth Protection and Utilization of Near-earth Objects
There exists an infrequent, but significant hazard to life and property due to impacting asteroids and comets. There is currently no specific search for long-period comets, smaller near-Earth asteroids, or smaller shortperiod comets. These objects represent a threat with potentially little or no warning time using conventional ground-based telescopes. These planetary bodies also represent a sig...
متن کاملHarvesting Near Earth Asteroid Resources Using Solar Sail Technology
There may be differences between this version and the published version. You are advised to consult the publisher's version if you wish to cite from it. Near Earth asteroids represent a wealth of material resources to support future space ventures. These resources include water from C-type asteroids for crew logistic support; liquid propellants electrolytically cracked from water to fuel crewed...
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ژورنال
عنوان ژورنال: Journal of Spacecraft and Rockets
سال: 2011
ISSN: 0022-4650,1533-6794
DOI: 10.2514/1.49851