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Posted: Tue Jul 19, 2011 9:59 pm Post Subject: Asteroid YU55 close pass in November
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Mark your calendars for an impressive and upcoming flyby of an asteroid that’s one of the larger potentially perilous space rocks in the heavens – in terms of smacking the Earth in the future.
It’s the case of asteroid 2005 YU55, a round mini-world that is about 1,300 feet (400 meters) in diameter. In early November, this asteroid will approach Earth within a scant 0.85 lunar distances.
Due the object’s size and whisking by so close to Earth, an extensive campaign of radar, visual and infrared observations are being planned.
Asteroid 2005 YU55 was discovered by Spacewatch at the University of Arizona, Tucson’s Lunar and Planetary Laboratory on Dec. 28, 2005. En route and headed our way, the cosmic wanderer is another reminder about life here on our sitting duck of a planet
“The close Earth approach of 2005 YU55 on Nov. 8, is unusual since it is close and big. On average, one wouldn’t expect an object this big to pass this close but every 30 years,” said Don Yeomans, manager of NASA’s Near-Earth Object Program Office and the Jet Propulsion Laboratory in Pasadena, Calif.
Yeomans said that with new radar capabilities at Goldstone in California — part of NASA’s Deep Space Network — there is a good chance of obtaining radar imaging of 2005 YU55 down to the 5-meter resolution level. Doing so, he said, would mean obtaining higher spatial resolution of the object than that attained by recent spacecraft flyby missions.
“So we like to think of this opportunity as a close flyby mission with Earth as the spacecraft,” Yeomans told SPACE.com. “When combined with ground-based optical and near-infrared observations, the radar data should provide a fairly complete picture of one of the larger potentially hazardous asteroids,” he said.
Asteroid 2005 YU55 is a slow rotator. Because of its size and proximity to Earth, the Minor Planet Center in Cambridge, Mass., has designated the space rock as a “potentially hazardous asteroid.
“We’re already preparing for the 2005 YU55 flyby,” said Lance Benner, a research scientist at JPL and a specialist on radar imaging of near-Earth objects. He said part of the plan is to observe the asteroid with radar using both the huge Arecibo dish in Puerto Rico and equipment at Goldstone.
“The asteroid will approach from the south, so Goldstone has the first chance to observe it due to its declination coverage,” Benner told SPACE.com.
To help coordinate the observing campaigns, “Radar Observations Planning” websites have been set up for this unusual occasion, Benner said.
“This flyby will be the closest by any near-Earth asteroid with an absolute magnitude this bright since 1976 and until 2028,” Benner added. “Having said that, nobody saw 2010 XC15 during its close flyby within 0.5 lunar distance in 1976,” he said, noting that this asteroid wasn’t discovered until late in 2010.
“Thus, the flyby by 2005 YU55 will be the closest actually observed by something this large, so it represents a unique opportunity,” Benner said. “In a real sense, this will provide imaging resolution comparable to or even better than a spacecraft mission flyby.”
Thought I would give it its own thread, it is special and unique after all...
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...weighing 55million tons, YU55 will be the largest object to ever approach Earth so close...
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labelled a 'potentially hazardous object' - if it was to hit Earth, it would exert a force the equivalent of 65,000 atomic bombs and leave a crater six miles wide and 2,000ft deep
Seems to be a lot of activity in the heavens, with Elenin passing at 20 odd million km out and Comet Honda at around 8-9 million km out and this big asteroid at some 300,000km out, all around a similar time frame.
