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 Post subject: Asteroid 2012TC4
PostPosted: Wed Oct 11, 2017 12:32 pm 
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Joined: Mon Jan 09, 2006 11:05 am
Posts: 5361
Location: Lancashire
Tomorrow, this near-Earth asteroid, measuring 15 to 30 metres wide ( about the size of the Chelyabinsk object in 2013 ), will whiz past our planet at a distance of less than 27,300 miles ( 44,000 km ). This places the asteroid just beyond the orbits of hundreds of Earth satellites.
The asteroid will be of special interest to trackers because Earth's gravitational field will alter its orbital parameters, although it will not by any means strike the Earth.
Nasa's Mike Kelly, who leads a team that is tracking the object, said "We've now been observing TC4 for two months, so we have very accurate position information on it, which in turn allows very precise calaculations of its orbit."
2012TC4 passed Earth five years ago, at about double the distance of tomorrow's fly past. It should be visible at mag 13 in 20CM 'scopes.

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