As asteroid 2012 DA14 silently flies toward Earth, how would you like to go along for the ride? Now you can, virtually speaking. NASA has created a simulated display that allows you to accompany the asteroid as it speeds toward the planet. Since the view refreshes every two minutes, you can watch the planet grow larger as the asteroid sweeps in to make its closest approach tomorrow around 1:24 p.m. Central Time. That’s when the real drama will unfold as 2012 DA14 passes just 17,200 miles over Indonesia before speeding back into the depths of space. Click HERE to make the trip.
Although 2012 DA14 won’t impact Earth, the planet’s gravity will leave a potentially strong impression on the asteroid. Besides bending its orbit into a smaller circle with a shorter orbital period during the flyby, it’s possible that the space rock might tremble with tremors or asteroid-quakes.
“We are going to be looking closely for evidence of seismic activity on 2014 DA14 as it passes by,” says Richard Binzel, a professor of planetary science at MIT. “This is the first case of an object coming close enough to experience quakes AND where we have enough notice to plan observations.”
A few years ago Binzel noticed a small group of asteroids that didn’t show signs of “space weathering” from bombardment by cosmic rays and solar radiation over the eons. High-energy particles interact with asteroids’ rocky surfaces and cause their soils to turn dark-red.
After studying their orbits, he discovered that all these “fresh-faced” space rocks had had close encounters with the Earth in the past million years.
“We believe they were ‘shaken up’ by their encounters with Earth,” he says. “Gravitational forces during the flybys can stretch, rattle, and torque these asteroids, causing dark, space-weathered material on the surface to be overturned, revealing the fresh stuff underneath.”
2012 DA14’s crust could shift by an inch or two and possibly release a puff of asteroid dust. MIT postdoc Nick Moskovitz, who works with Binzel, is coordinating observations with worldwide observatories to pin down the color, spin, shape, and reflectivity of the asteroid as it passes by. NASA’s 70-meter Goldstone radar dish will also repeatedly ping 2012 DA14 with radio waves and measure the energy reflected back to create a 3D picture of it. If we’re very fortunate, the dish might even see the effects of seismic activity. Read more on the topic HERE.
Nice video about the flyby from NASA’s ScienceCast