A newfound comet dived through the sun's atmosphere today (Dec. 15), blazing up and most likely flaming out as scientists around the world watched.
Comet Lovejoy plunged through the sun's corona at about 7 p.m. EST today (midnight GMT on Dec. 16), coming within 87,000 miles (140,000 kilometers) of our star's surface. Temperatures in the corona can reach 2 million degrees Fahrenheit (1.1 million degrees Celsius), so Lovejoy was most likely completely destroyed, researchers said.
Scientists eager to record and study the comet's dramatic demise trained a variety of instruments on Lovejoy as it streaked toward the sun.
"We have here an exceptionally rare opportunity to observe the complete vaporization of a relatively large comet, and we have approximately 18 instruments on five different satellites that are trying to do just that," Karl Battams, a scientist at the Naval Research Laboratory in Washington, D.C., wrote on the Sungrazing Comets website today, before Lovejoy's closest solar approach.
Battams runs the website, which is devoted to comets discovered by two different spacecraft: NASA's Solar Terrestrial Relations Observatory (STEREO) and the Solar and Heliospheric Observatory (SOHO), which is operated jointly by NASA and the European Space Agency (ESA). [Death of a Comet: Photos of Sungrazing Comet Lovejoy]
Preparing for the end
Lovejoy has a core about 660 feet (200 meters) wide. It belongs to a class of comets known as Kreutz sungrazers, whose orbits bring them very close to the sun.
All Kreutz sungrazers are thought to be the remnants of a single giant comet that broke apart several centuries ago. They're named after the 19th-century German astronomer Heinrich Kreutz, who first showed that such comets are related.
Comets plunge into the sun on a regular basis, but they rarely give much advance notice of their suicidal intentions. That's why scientists were so excited about Lovejoy. Australian amateur astronomer Terry Lovejoy discovered the icy wanderer on Nov. 27, giving researchers plenty of time to map out their observation campaign.
And that campaign has been intense, involving five different spacecraft. In addition to SOHO and STEREO, scientists planned to use NASA's Solar Dynamics Observatory (SDO), Japan's Hinode satellite and ESA's Proba spacecraft to track Lovejoy's movements and demise, Battams wrote.
NASA also created a website providing updates about the comet's pass through the corona, as well as images of the event beamed down by SDO. It can be found here: http://sdo.gsfc.nasa.gov/data/lovejoy.php
For his part, Terry Lovejoy said he was happy to have made a contribution, and he marveled a bit at all the attention the comet has been getting.
"It's been tremendous," Lovejoy told SPACE.com. "Apparently it's all over Facebook, and I don't use Facebook. But there's a lot of interest. I think a lot of people like the name — the Lovejoy name seems to strike a chord with people."
A dramatic death
Lovejoy is quite large for a sungrazing comet, and experts expected it to die an impressive death. The website Spaceweather.com, for example, predicted Lovejoy would blaze as brightly as Jupiter or Venus in the sky in its last moments.
Battams also expected a good show, saying the comet might even be visible from the ground around sunset today in the Northern Hemisphere. CAUTION: Never point binoculars or a telescope at or near the sun, and never look directly at the sun with the naked eye. Serious eye damage can result.
"I do think that it will put on a spectacular show for us and will be the brightest Kreutz-group comet that SOHO has ever observed," Battams wrote last week.
Though the early returns are just starting to come in, those forecasts appear to be on the money. Observations from various spacecraft do indeed show Lovejoy flaring up significantly as it neared our star.
Researchers will keep analyzing the images to better understand the comet's daring solar approach — and to determine whether or not it survived its trial by fire.
SPACE.com assistant managing editor Clara Moskowitz (@ClaraMoskowitz) contributed to this story. You can follow SPACE.com senior writer Mike Wall on Twitter: @michaeldwall. Follow SPACE.com for the latest in space science and exploration news on Twitter @Spacedotcom and on Facebook.
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