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All in the Family: Scientists Find Mother and Daughter Asteroids
Boulder - Nov 12, 2001 There are asteroids and there are asteroids. Most were once part of larger "parent bodies" and some supply meteorites that plunge to Earth. But how do you trace the family line of asteroids? Scientists compare mineralogy of asteroids by analyzing their near-infrared spectra. They also compare asteroids' orbits around the sun. And recently they found a perfect match -- "uniting" in a scientific sense, mother and daughter asteroids. "We determined the mineralogy of asteroid 1929 Kollaa and found that it was once part of a larger asteroid called 4 Vesta. I was inspired to observe these objects because they belong to the rare V-class of asteroids, and they have orbits about the Sun that are very similar," explained Michael Kelley from NASA's Johnson Space Center. "Vesta is the asteroid for which the V-class was established. Until now, no mineralogical analysis had ever been done on another V-type. In that sense, Vesta was unique until our recent work was done. We found not only that this second V-class asteroid, 1929 Kollaa, was once part of Vesta, but that it is also related to a very specific group of meteorites." Kelley presented this new discovery November 8, at the Geological Society of America's annual meeting in Boston. Most planetary scientists believe that 4 Vesta is the source of howardite, eucrite, and diogenite meteorites (HED) found on Earth, but Kelley points out that it is not a direct process. "Vesta is located in a part of the main asteroid belt that makes it almost impossible for it to deliver meteorites directly to Earth. So there are probably intermediate asteroids, which were once part of Vesta, located in more favorable orbits that provide delivery." One of the ramifications of this discovery is that it will help scientists build a geologic map of the asteroid belt and understand what forces have acted on asteroids in the past. This information, along with asteroids' mineralogy, would be crucial if there was ever a need to prevent an asteroid from striking the Earth and causing a major disaster. Related Links Geological Society of America SpaceDaily Search SpaceDaily Subscribe To SpaceDaily Express
Astronomers Anticipate Meteor "Storm" This Weekend
Cambridge - Nov 8, 2001Most everyone has glimpsed an occasional "shooting star," or meteor. But imagine what it would be like to see hundreds -- or even thousands -- of them in a single night. Such a spectacle may occur in the hours before dawn on Sunday, November 18th. In fact, if astronomers' predictions hold up, skywatchers in North America can expect to see their most dramatic meteor display in 35 years. "Earth is about to plow through a cloud of space dust that could light up our skies with celestial fireworks," notes Alan MacRobert, senior editor for Sky & Telescope magazine. |
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