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Topic - Rogue planet, 400C - how can this be

pebbles - on 14 Nov 2012
apparently astronomers have "spotted a "rogue planet" - wandering the cosmos without a star to orbit - 100 light-years away."

the report says "The team believe it has a temperature of about 400C and a mass between four and seven times that of Jupiter "
how come its so warm if it hasnt got a star? its pretty big, but the surface temperature of jupiter is still -145 degrees C. So do they mean core temperature or something? Or is it just a typo or the reporter misunderstanding? Any of the astronomer types on here know?

http://www.bbc.co.uk/news/science-environment-20309762
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