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The astronomers who in July announced the discovery of a "10th planet" in our Solar System say the object has a moon.
The new development comes as a result of observations made with the Keck Observatory on Mauna Kea, Hawaii.
Michael Brown, from the California Institute of Technology, US, says the find will help his team make a better determination of the new planet's mass.
Currently, the planet has been dubbed Xena; the moon will be called Gabrielle until official names are agreed.
Both "codenames" come from characters in a US TV series, Xena: Warrior Princess.
"Since the day we discovered Xena, the big question has been whether or not it has a moon," Professor Brown said in a statement.
"Having a moon is just inherently cool - and it is something that most self-respecting planets have, so it is good to see that this one does, too."
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