http://www.discovery.com/news/briefs/20000505/space_asteroid.html

Asteroid a Giant, Metal Dog Bone

By Larry O'Hanlon,
Discovery.com News

May 5, 2000 - An unparalleled peek at the asteroid Kleopatra has revealed it
to be a bizarre, gigantic, metal dog bone the size of New Jersey.

"With its dog-bone shape, Kleopatra has the most unusual shape we've seen in
the solar system," said radio astronomer Steven Ostro, of NASA's Jet
Propulsion Laboratory, who reports on the asteroid in the current issue of
Science.

One of larger asteroids in the main asteroid belt between Mars and Jupiter,
Kleopatra was discovered in 1880. But the space rock's shape was unknown
until the researchers created the new radar images - the first ever made of
a main belt asteroid.

Kleopatra's surface appears to be made of a floury metallic powder, with
metal rubble along its narrow neck. The metallic asteroid was apparently
created by the slow-motion collision of two regular, spherical metallic
asteroids, but no one has any idea exactly how such a collision could create
the odd shape.

"The real mystery in my mind is how you make a metal dumbbell the size of
New Jersey," said Ostro.

At roughly 140 miles by 50 miles, Kleopatra is also perhaps the solar
system's biggest bonanza in usable metal deposits, if only someone had a way
to get there and bring the riches back.

Ostro's team used revamped radar equipment at the powerful Arecibo radio
telescope in Puerto Rico to construct a picture of the Kleopatra and its
composition from radar signals bounced off the asteroid - then at a distance
of about 106 million miles from Earth.

The team chose Kleopatra because previous ground-based observations hinted
that the rock was no ordinary potato-shaped asteroid.

"It is one of the strangest objects in the solar system," said astronomer
Clark Chapman of the Southwest Research Institute in Boulder, Colo.

Like most metallic asteroids, Kleopatra appears to be made of nickel and
iron, with other metals mixed in. Like all metallic asteroids, it was likely
once part of the metallic core of larger body - a planetoid or large
asteroid - in which the metals melted out of other rocks and sank towards
the center, as happened on Earth, explains Chapman. Many of these larger
bodies were then blown apart in cosmic collisions.

As for its mining potential, Ostro calculates there's probably enough gold
on Kleopatra to produce eight million cubic meters of gold. But because of
Kleopatra's distance, the gold would cost far more than its worth to bring
it back.

If space mining ever becomes a reality, says Ostro, its aim will probably be
to get materials for structures that will remain in space.

================================
Robert F. Tatman
[EMAIL PROTECTED]
Jenkintown, PA, USA
"Y Gwir Yn Erbyn y Byd"--Y Bardd Cymraeg
"The Truth Against the World"--motto of the Welsh bards

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