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AS 209 is a young pre-main-sequence K-type star located in the Ophiuchus star formation region about 126 parsecs from the Sun. It has a mass of 0.9 solar masses and a luminosity of 1.5 solar luminosity. It is only somewhere between 0.5-1.0 million years old. Surrounding AS 209 is a remarkable protoplanetary disk. This disk is separated into several distinct parts. There the central core and extending from it lies two prominent rings at 75 AU and 135 AU. These rings have different widths and depths with the inner one being narrower and shallower.
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