WASHINGTON — Comet ISON, once optimistically called the "comet of the
century," is dead, the victim of a way-too-close brush with the sun. It
was barely a year old.
The comet, which excited astronomers and
the media as it zipped within 730,000 miles of the sun on Thanksgiving
Day, was pronounced dead at a scientific conference Tuesday. Astronomers
who had followed the ice ball mourned the loss of the sky show that
once promised to light up during December.
Naval Research Lab
astronomer Karl Battams, who headed the observing campaign for the
comet, said ISON was stretched and pulled by the sun's powerful gravity.
It was also hit with solar radiation. And the icy snowball just fell
apart.
"At this point it seems like there is nothing left,"
Battams said at the American Geophysical Union conference in San
Francisco. "Sorry, everyone, Comet ISON is dead. But its memory will
live on."
Astronomers had hoped it would survive because some —
but not most — comets make it past close approaches with the sun. Last
year, Comet Lovejoy did.
RELATED: Comet ISON's leftovers fade away, right before a satellite's eyes
Had
ISON survived it would have provided good naked-eye viewing in early
December for the Northern Hemisphere, astronomers said. NASA had aimed
several telescopes and spacecraft at the comet to watch its close brush
with the sun, only to find it missing after the encounter.
Comets
are balls of dust and ice from the formation of the solar system
billions of years ago. ISON was on its first trip after leaving the Oort
cloud on the distant fringes of the solar system. Unlike comets that
are "hardened" by several trips around the sun, ISON just couldn't
survive its maiden voyage, Battams said.
ISON, about half a mile wide, was tiny and probably smaller than originally estimated, Battams said.
As
the comet neared its closest approach to the sun, astronomers had a
sense of loss. Battams called watching it in those final hours "a
process of heartbreak."
© 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.
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