2012 TC4 is estimated to be around 15 metres across, is probably an elongated shape, and is moving at around 7.6 km/second relative to Earth.
A small asteroid by the name of 2012 TC4 will pass by the earth on Thursday just 42,000kms above the Antarctic continent. "Not even for satellites".
Mike Kelley, who works to spot and track the space rock at Nasa, said there was "no danger".
"We've now been observing TC4 for two months, so we have very accurate position information on it, which in turn allows very precise calculations of its orbit", which will not cross that of Earth nor its satellites, he said.
It is expected to swing around again in 2050 and 2079 as it continually loops the Sun.
The 65-foot-wide asteroid won't hit us, but NASA and other asteroid scientists are watching the flyby closely as they prepare a defense against a future space rock that could come crashing down in a big load of terrible, like the asteroid that scientists say wiped out dinosaurs 65 million years ago. There's no chance the asteroid will hit the Earth, but its proximity will be used to test an asteroid warning system. "There are tens of thousands of objects that are known or tracked and nothing now poses any direct risk, but organizations like NASA and other space agencies around the world are working on plans for what to do if something is coming our way, so we have a better chance than the dinosaurs", said Glenn.
This may sound like a long way away, yet it's a short distance in planetary terms and around one eighth of the distance between the Earth and the Moon. It would provide the trackers all over the world with a great opportunity to test their capability of functioning as an global asteroid warning network. The asteroid is at No. 13 on the "risk list" of objects that could impact Earth.