M51-ULS-1

Author(s): crowbar_prodigy

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M51-ULS-1, also known as RX J132943+47115, is a distant extragalactic high mass X-ray binary system consisting of a 20 Solar mass blue supergiant star and a 1.4 or 10 Solar mass neutron star or black hole about 23,000,000 light-years away in the constellation Canes Venatici. In 2012, an X-ray transit event was detected by the Chandra X-ray Observatory, lasting for 3 hours. In 2020, a reanalysis of the X-ray transit event found that it could be explained by a 0.7 Jupiter radii planet, which the possible planet is yet to be confirmed.

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