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The twofold comet: Comet 67P/Churyumov-Gerasimenko

New images obtained by Rosetta confirm Comet 67P Churyumov-Gerasimenko’s peculiar two-part shape.
RELATED TOPICS: SOLAR SYSTEM | COMETS
Comet 67P/Churyumov-Gerasimenko
An image of comet 67P/Churyumov-Gerasimenko (left) obtained July 14th, 2014, and the corresponding interpolated data (right). The left image was taken by OSIRIS, the mission’s onboard scientific imaging system, from a distance of approximately 7,500 miles (12,000 kilometers).
SA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA
As the European Space Agency’s (ESA) spacecraft Rosetta is slowly approaching its destination, Comet 67P/Churyumov-Gerasimenko is again proving to be full of surprises. New images obtained by OSIRIS, the onboard scientific imaging system, confirm the body’s peculiar shape that earlier pictures had hinted at. 67P is obviously quite unlike any other comet visited so far.

“The distance still separating Rosetta from 67P is now far from astronomical,” said OSIRIS Principal Investigator Holger Sierks from the Max Planck Institute for Solar System Research (MPS) in Germany. “It’s a trip of less than 12,000 kilometers [7,500 miles]. That’s comparable to traveling from Germany to Hawaii.”

However, while taking a snapshot of Mauna Kea, Hawaii’s highest mountain, from Germany is an impossible feat, Rosetta’s camera OSIRIS is doing a great job at catching ever clearer glimpses of its similarly sized destination. Images obtained July 14 clearly show a tantalizing shape. The comet’s nucleus consists of two distinctly separate parts.

“This is unlike any other comet we have ever seen before,” said Carsten Güttler from MPS. “The images faintly remind me of a rubber ducky with a body and a head,” he added with a laugh.

How 67P received this duck-like shape is still unclear. “At this point, we know too little about 67P to allow for more than an educated guess,” said Sierks. In the next months, the scientists hope to determine more of the comet’s physical and mineralogical properties. These could help decide whether the comet’s body and head were formerly two individual bodies.

In order to get an idea of what seems to be a unique body, the observed image data can be interpolated to create a smoother shape. “There is, of course, still uncertainty in these processed filtered images, and the surface will not be as smooth as it now appears,” Güttler said. “But they help us to get a first idea.”
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