315 Constantia is a stony background asteroid from the inner region of the asteroid belt, approximately 6.5 kilometers (4 miles) in diameter. It was discovered by Austrian astronomer Johann Palisa at the Vienna Observatory on 4 September 1891. The asteroid is a member of the Flora family. It is spinning with a rotation period of 5.345±0.003 h and shows a brightness variation of 0.57±0.2 in magnitude.

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