[meteorite-list] Two years on, source of Russian Chelyabinsk meteor remains elusive

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Two years on, source of Russian Chelyabinsk meteor remains elusive


Two years after a 20-meter rock slammed into the Earth after a meteoroid
dramatically fragmented in the atmosphere over the Chelyabinsk region in
Russia and injured hundreds of people, its parent asteroid remains
elusive, a new paper published in the journal Icarus shows. 

Astronomers had originally predicted that a 2-km near-Earth asteroid
(NEA) designated (86039) 1999 NC43 could be the source body from which
the Chelyabinsk meteoroid was ejected prior to its encounter with the
Earth. 

"These two bodies shared similar orbits around the Sun, and initial
studies suggested even similar compositions," said Planetary Science
Institute research scientist Vishnu Reddy, lead author of "Link Between
the Potentially Hazardous Asteroid (86039) 1999 NC43 and the Chelyabinsk
Meteoroid Tenuous" that appears in Icarus.

However, reanalysis of the orbital parameters and spectral data by an
international team of researchers led by Reddy has shown that the link
between Chelyabinsk and 1999 NC43 is unlikely. "The composition of
Chelyabinsk meteorite that was recovered after the event is similar to a
common type of meteorite called LL chondrites. However, the near-Earth
asteroid has a composition that is distinctly different from this,"
Reddy said. 

They study also showed that linking specific meteorites to an asteroid
is extremely difficult due to the chaotic nature of the orbits of these
bodies.


Read more at:
http://phys.org/news/2015-02-years-source-russian-chelyabinsk-meteor.html#jCp