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SOLAR SCIENCE
SOHO Sees Something New Near The Sun
by Staff Writers
Greenbelt MD (SPX) Feb 25, 2015


A description of sungrazer comets and where they come from. Image courtesy NASA/Goddard Space Flight Center/Duberstein.

An unusual comet skimmed past the sun on Feb 18-21, 2015, as captured by the European Space Agency (ESA) and NASA's Solar and Heliospheric Observatory, or SOHO.

This comet was interesting for two reasons. First it's what's called a non-group comet, meaning it's not part of any known family of comets. Most comets seen by SOHO belong to the Kreutz family - all of which broke off from a single giant comet many centuries ago.

The second reason it's interesting is because the vast majority of comets that come close enough to the sun to be seen by SOHO do not survive the trip. Known as sungrazers, these comets usually evaporate in the intense sunlight. This comet made it to within 2.2 million miles of the sun's surface - but survived the trip intact.

"There's a half-decent chance that ground observers might be able to detect it in the coming weeks," said Karl Battams, a solar scientist at the Naval Research Lab in Washington, D.C. "But it's also possible that events during its trip around the sun will cause it to die fairly fast."

Since launching in 1995, SOHO has become the number one comet finder of all time -- this was comet discovery number 2,875. However, SOHO sees non-group comets like this only a few times a year.

Watch the video to see the comet fly around the sun. Toward the end of the video, as the comet begins to develop a tail, the sun releases an eruption of solar material, called a coronal mass ejection, or CME, to add something more to the scene.


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As the sun skims through the galaxy, it flings out charged particles in a stream of plasma called the solar wind, and the solar wind creates a bubble extending far outside the solar system known as the heliosphere. For decades, scientists have visualized the heliosphere as shaped like a comet, with a very long tail extending thousands of times as far as the distance from the Earth to the sun. ... read more


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