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It was discovered by David L. Rabinowitz then of the University of Arizona's Spacewatch Project and named by him after Pholus, the brother of the mythological Chiron, after which 2060 Chiron was named.
5145 Pholus was the second Centaur type asteroid discovered and was quickly found to be the reddest object observed to date in the Solar System. Unlike the first Centaur, 2060 Chiron, Pholus has shown no signs of cometary activity.
The diameter of Pholus is estimated to be 185±16 km [1].
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