Huge Asteroid to Fly Past Earth July 3

Joe Rao
SPACE.com Skywatching Columnist
SPACE.com

Mon Jun 26, 1:00 PM ET

An asteroid possibly as large as a half-mile or more in diameter is rapidly
approaching the Earth. There is no need for concern, for no collision is in
the offing, but the space rock will make an exceptionally close approach to
our planet early on Monday, July 3, passing just beyond the Moon's average
distance from Earth.

Astronomers will attempt to get a more accurate assessment of the asteroid's
size by “pinging” it with radar.

And skywatchers with good telescopes and some experience just might be able
to get a glimpse of this cosmic rock as it streaks rapidly past our planet in the
wee hours Monday. The closest approach occurs late Sunday for U.S. West
Coast skywatchers.

The asteroid, designated 2004 XP14, was discovered on Dec. 10, 2004 by
the Lincoln Laboratory Near Earth Asteroid Research (LINEAR), a continuing
camera survey to keep watch for asteroids that may pass uncomfortably close
to Earth.

Although initially there were concerns that this asteroid might possibly impact
Earth later this century and thus merit special monitoring, further analysis of its
orbit has since ruled out any such collision, at least in the foreseeable future.

Size not known

Asteroid 2004 XP14 is a member of a class of asteroids known as Apollo, which
have Earth-crossing orbits. The name comes from 1862 Apollo, the first asteroid
of this group to be discovered. There are now 1,989 known Apollos.

The size of 2004 XP 14 is not precisely known. But based on its brightness, the
diameter is believed to be somewhere in the range of 1,345 to 3,018-feet
(410 to 920 meters). That's between a quarter mile and just over a half-mile
wide.

Due to the proximity of its orbit to Earth [Map] and its estimated size, this object
has been classified as a “Potentially Hazardous Asteroid” (PNA) by the Minor
Planet Center in Cambridge, Massachusetts. There are currently 783 PNAs.

The latest calculations show that 2004 XP14 will pass closest to Earth at 04:25
UT on July 3 (12:25 a.m. EDT or 9:25 p.m. PDT on July 2). The asteroid's
distance from Earth at that moment will be 268,624-miles (432,308 km), or
just 1.1 times the Moon's average distance from Earth.

Spotting 2004 XP14 will be a challenge, best accomplished by seasoned
observers with moderate-sized telescopes.

On April 13, 2029, observers in Asia and North Africa will have a chance to
see another asteroid, but without needing a telescope. Asteroid 99942 Apophis,
about 1,000 feet (300 meters) wide, is expected to be visible to the naked eye
as it passes within 20,000 miles (32,000 km). Astronomers say an asteroid that
large comes that close about once every 1,500 years.

Observing plans

As 2004 XP14 makes its closest approach to Earth, astronomers will attempt to
gauge its size and shape by analysis of very high frequency radio waves reflected
from its surface.

Such radar measurements of the exact distance and velocity of the asteroid will
allow for precise information on its orbit. From this scientists can also discern
details of the asteroid's mass, as well as a measurement of its density, which is
a very important indicator of its overall composition and internal structure.

Astronomers plan to utilize NASA's 70-meter (230-foot) diameter Goldstone
radar, the largest and most sensitive antenna in its Deep Space Network.
Located in California's Mojave Desert, the Goldstone antenna has been used
to bounce radio signals off other Near-Earth asteroids many times before, and
it is now being readied to “ping” 2004 XP14 on July 3, 4 and 5.

Augmenting the Goldstone observations will be radar observations scheduled
at Evpatoria in the Ukraine, commencing several hours prior to the July 3
observations at Goldstone.

Editor's Note: A SPACE.com viewer's guide for 2004 XP14 will be presented
in Joe Rao's weekly Night Sky column on Friday, June 30.

http://space.com/scienceastronomy/060626_asteroid_close.html

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