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2011 MD, An Asteroids Near Miss

Posted: June 28th, 2011 | Author: | Filed under: Astronomy, Blip, Buster Cookson, Science | Tags: , , , , , , , , , , | Comments Off on 2011 MD, An Asteroids Near Miss

Just in case you haven’t been paying attention to the news – There’s an asteroid hurtling toward Earth – astronomers clocked its top speed at around 63,000 mph / 101,000 kph. Ooops, you missed it!? An asteroid – named 2011 MD – with an estimated girth as large as a garbage truck has soared within 12,000 km of the Earth, passing harmlessly over the Atlantic Ocean.  The space rock, measuring 5 to 20 metres in diameter, followed the same near-Earth path that scientists had earlier predicted, looping around the planet in a boomerang-shaped trajectory, said DC Agle from NASA’s – JPL – Jet Propulsion Laboratory. Its nearest approach to Earth, about 12,000 km, was 30 times farther away than the International Space Station, which orbits the planet at a distance of 400 km. On a more celestial scale, the asteroid’s closest distance to Earth was just 3 per cent of the 400,000 kilometres separating the Earth from the moon.  If the asteroid had been on a collision course with Earth, the space rock would have been large enough and fast enough that it would have made it to the ground, said MIT planetary scientist Ben Weiss. “You’d end up with some sort of explosion and a decent-size crater,” he said. “You wouldn’t have wanted something like this to land in Manhattan.” Researchers with MIT’s Lincoln Near Earth Asteroid Research LINEAR program discovered the asteroid on June 22 and pegged its size between 20 feet (6.3 meters) and 46 feet (14 meters) wide. Although small by asteroid standards, 2011 MD was close enough for amateur astronomers to spot it with modest telescopes.

Asteroid 2011 MD is considered an Apollo-type asteroid, because its orbit is very similar to Earth’s yet longer in duration and more oval-shaped. Astronomers expect the space rock to swing by again in the future, perhaps more closely the next time around. Australian Astronomical Observatory’s Fred Watson says the closeness of 2011 MD is a reminder to people that events on Earth have the potential to be shaped by asteroids – “like the annihilation of the dinosaurs, t reminds people we live in an environment littered with debris of this kind, which is actually the leftovers of the solar system’s formation about 4.6 billion years ago”

“It alerts people to the fact we live in a dynamic environment and space is worth watching,  astronomers are keeping a close eye on an asteroid called Apophis, which will come very close to the Earth in 2029.

“It’s not impossible that something will collide with the Earth in the future, there are objects that we know will present a potential threat. In 2029 there is one that will pass very close to the Earth but probably won’t hit the Earth. But depending on how near the Earth it goes, it might be deflected into an orbit that will take it onto a collision course, probably in the 2030s.” said Watson.

Eyes to the sky people!?

 


Funkinwagnill: Fact # 000149

Posted: March 23rd, 2011 | Author: | Filed under: Astronomy, Cankler, Diana Detox, Funkinwagnill | Tags: , , , , , , , , | Comments Off on Funkinwagnill: Fact # 000149

Only one satellite has been ever been destroyed by a meteor, the European Space Agency’s Olympus in 1993. If two satellites collide who’s insurance pays, and do you have to overtake on the right in space. Whatever road rules they’re using in space it’s working. With well over 8,000 satellites whirling around the planet – all launched since 1957 – there has ever only been one hit by a meteor and only one collision between two satellites. With the added complication that some satellites travel at very high speed –26,00km/h– while others don’t travel at all – they are in geo-stationary orbits –  it is amazing that more satellites haven’t met an early demise. The satellite Olympus was hit by debris from the Perseid shower, a meteor shower caused by the annual visit of comet 109P/Swift-Tuttle passing close to the earth. The satellite would normally have been moved out of danger but had already been partially disabled. The fact that there aren’t more satellite incidents is completely down to the satellites being moved to avoid any known dangers, such as meteor showers. Ground control of satellites by NORAD and other montioring stations is the only defence for satellites, until the get theyre own lasers anyway.