A space probe aiming to become the first to land on a comet has taken images that appear to show its target could actually be two separate lumps of rock and ice, scientists said on Thursday.
The pictures released by the European Space Agency were taken by its Rosetta probe, which is nearing the final stage of its decade-long mission to drop a lander on comet 67P/Churyumov-Gerasimenko.
“Some people have already likened the shape to a duck, with a distinct body and head,” the agency said.
Mission scientist Matt Taylor had a different comparison: “a strange-looking potato.”
“It’s certainly an exciting surprise,” Taylor said.
Until now 67P was believed to have a more compact, rounded form. One explanation is that the comet is a so-called contact binary composed of two parts, indicating that 67P either broke apart or fused with another comet at some point. Another is that it is one unit deformed by its passage past Jupiter or the sun, Taylor said.
However, because the pictures were shot when Rosetta was 12,000km from the comet — about the distance between New York and Johannesburg — the unusual shape could also result from a digital processing method that was used to smoothen the image, he said.
“We’re looking forward to the next month when this body comes into closer resolution,” Taylor said, adding that for the time being scientists are not making any changes to the probe’s flight path.
Rosetta is scheduled to come within 100km of the comet on Aug. 6. It will observe the comet for several months before attempting to drop a lander onto its icy surface in November.
67P is about 4km long and orbits the sun every six-and-a-half years.
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