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Comet C/2011 L4 (PANSTARRS)

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A tough comet survives a close encounter with the Sun

Although astronomers expected it to die a fiery death, Comet Lovejoy passes within 87,000 miles (140,000 kilometers) of our star and re-emerges on the other side.

By Karri Ferron Published: December 16, 2011
Comet-Lovejoy-survives
Comet Lovejoy survives! The comet re-emerges back into the views of the Solar & Heliospheric Observatory, almost as bright as before, in this image, although it appears to have lost its tail.
Photo by SOHO (NASA/ESA)

On November 27, 2011, Australian astronomer Terry Lovejoy made an exciting discovery: He spotted a Kreutz-family comet, the first time such a comet has been spotted using a ground-based telescope since the 1970s. Kreutz comets have orbits that bring them very close to the Sun.

Scientists were immediately excited about the finding, designated C/2011 W3 (Lovejoy). Discovering a comet before it moves into view of space-based telescopes gives astronomers the opportunity to prepare their telescopes for the best possible observations. Using the joint NASA/European Space Agency Solar Heliophysics Observatory (SOHO) and Solar Terrestrial Relations Observatory (STEREO), as well as NASA's Solar Dynamics Observatory (SDO), astronomers were able to begin tracking the comet starting Monday, December 12.

They expected Comet Lovejoy to die a fiery death as it plunged through the Sun's corona at about 7 p.m. EST December 15, coming within 87,000 miles (140,000 kilometers) of our star's surface. But, amazingly, Lovejoy survived. A video (embedded below) taken by SDO spacecraft shows the icy object emerging from behind the Sun and zipping back off into space.

You can continue to get updates about this sungrazing comet from Karl Battams, a scientist at the Naval Research Laboratory in Washington, D.C., on the Sungrazing Comets website.

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5 stars
KEITH MIRENBERG from NEW YORK said:
See www.nasa.gov for beautiful video images of this comet taken from aboard the ISS.
5 stars
ROBERT MCCABE from NORTH CAROLINA said:
Unbelievable!
5 stars
KRIS GRAUEL from TENNESSEE said:
Very cool indeed!
5 stars
BILL SIMPSON from LOUISIANA said:
I'm glad I didn't make a bet on this one. It shows how wrong my comment yesterday, about the danger of a supernova explosion, might be, because the energy transfer of a low density gas might not be as great a threat as it appears. ( I wouldn't volunteer to test that theory by journeying near a star that is ready to blow up. The thermal radiation might be a bit much.)
I wonder if dust coming from the comet's ice, as it melted, acted as a heat shield, or if it was just the fact that it takes a lot of energy input to melt ice, that enabled the comet to survive. Think how long ice cubes last in your glass on a hot day. It is quite amazing, if you take the time to contemplate it. Make a block of ice in your freezer by filling up a plastic ice cream container with water. Put it outside and see how long it takes to melt. And that is in a dense atmosphere, compared to the atmosphere near the Sun. It looks like the tidal forces did most of the damage to the poor thing, just like the one that hit Jupiter, a while back. It got torn up before impact. That was too bad, because if it had hit in one chunk, we might have been able to see some flash through an amateur telescope.
Thanks to Terry Lovejoy for finding his comet so everyone could get ready. Terry also demonstrated the danger of comets approaching from the wrong direction - no chance to do a thing about it if they are on a collision course.
I wonder if comets grow when they go back out there by gathering water molecules or tiny microscopic ice crystals. Probably not, so we can expect a comet shortage in the future. I wonder if a big one just grazed our atmosphere, if the heat transfer would do a lot of damage at the surface?
5 stars
ANTHONY AYIOMAMITIS from PENNSYLVANIA said:
Awesome video clip!
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