REUTERS - A comet blazing toward Earth could outshine the full moon when it passes by at the end of next year - if it survives its close encounter with the sun.
The recently
discovered object, known as comet ISON, is due to fly within 1.2 million
miles (1.9 million km) from the center of the sun on November 28, 2013
said astronomer Donald Yeomans, head of NASA's Near Earth Object Program
at the Jet Propulsion Laboratory in Pasadena, Calif.
As the comet approaches,
heat from the sun will vaporize ices in its body, creating what could
be a spectacular tail that is visible in Earth's night sky without
telescopes or even binoculars from about October 2013 through January
2014.
If the comet survives, that is.
Comet ISON could break apart as it nears the sun, or it could fail to produce a tail of ice particles visible from Earth.
Celestial visitors
like Comet ISON hail from the Oort Cloud, a cluster of frozen rocks and
ices that circle the sun about 50,000 times farther away than Earth's
orbit. Every so often, one will be gravitationally bumped out from the
cloud and begin a long solo orbit around the sun.
On September 21,
two amateur astronomers from Russia spotted what appeared to be a comet
in images taken by a 16-inch (0.4-meter) telescope that is part of the
worldwide International Scientific Optical Network, or ISON, from which
the object draws its name.
Novichonok and co-discoverer Vitali Nevski followed up the next night with a bigger telescope at the Maidanak Observatory in Uzbekistan. Other astronomers did likewise, confirming the object, located beyond Jupiter's orbit in the constellation Cancer, was indeed a comet.
"It's really rare, exciting," Novichonok wrote.
Comet ISON's path is very similar to a comet that passed by Earth in 1680, one which was so bright its tail reportedly could be seen in daylight.
The projected orbit of comet ISON is so similar to the 1680 comet that some scientists are wondering if they are fragments from a common parent body.
"Comet ISON�could
be the brightest comet seen in many generations - brighter even than
the full moon," wrote British astronomer David Whitehouse in The
Independent.
In 2013, Earth has two shots at a comet show. Comet
Pan-STARRS is due to pass by the planet in March, eight months before
ISON's arrival.NASA's Mars Curiosity rover may be able to provide a preview.
Comet ISON is due to pass by the red planet in September and could be a target for the rover from its vantage point inside Gale Crater.
The last comet to
dazzle Earth's night-time skies was Comet Hale-Bopp, which visited in
1997. Comet 17P/Holmes made a brief appearance in 2007.