The National Aeronautics and Space Administration (NASA)’s Hubble Space Telescope has recorded the never-before-seen break-up of an asteroid into as many as 10 smaller pieces.
Fragile comets, comprised of ice and dust, have been seen falling apart as they approach the sun, but nothing like this has ever before been observed in the asteroid belt, reported NASA Science.
“This is a rock, and seeing it fall apart before our eyes is pretty amazing,” David Jewitt of the University of California, who led the astronomical forensics investigation, was quoted by NASA Science as saying.
The crumbling asteroid was first noticed as an unusual, fuzzy-looking object on Sept. 15, 2013.
A follow-up observation on October 1 with the W. M. Keck Observatory on the summit of Mauna Kea, a dormant volcano on the island of Hawaii, revealed three bodies moving together in an envelope of dust nearly the diameter of Earth.
“The Keck Observatory showed us this thing was worth looking at with Hubble,” Jewitt said.”
“With its superior resolution, space telescope observations soon showed there were really 10 embedded objects, each with comet-like dust tails.”
“The four largest rocky fragments are up to 400 yards in diameter, about four times the length of a football field,”
Hubble data showed the fragments drifting away from each other at a leisurely one mph. The asteroid began coming apart early last year, but new pieces continue to reveal themselves, as proved in the most recent images.
It is unlikely the asteroid is disintegrating because of a collision with another asteroid, which would have been instantaneous and violent by comparison to what has been observed.
Debris from such a high-velocity smashup would also be expected to travel much faster than observed. Nor is the asteroid coming unglued due to the pressure of interior ices warming and vaporizing.
This leaves a scenario in which the asteroid is disintegrating due to a subtle effect of sunlight, which causes the rotation rate of the asteroid to gradually increase. Eventually, its component pieces — like grapes on a stem — succumb to centrifugal force and gently pull apart.
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