Serendipitous Discovery of the Oldest Known Photographic Plates with Images of Pluto

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Scientific paper

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Scientific paper

We have located and verified the presence of Pluto on two photographic plates taken at Yerkes Observatory in August and November 1909 using a 6 inch refractor. Remarkably Pluto's location in the sky at this time closely coincided with the area from which Halley's comet emerged from the outer solar system to being observable with photographs; two other comets in the sky were also nearby (<5 degrees) around that time. We reconstruct the history of the event which includes the 1930 efforts, and failure, for finding Pluto on these and other plates taken in parallel with a 10 inch refractor. A pair of images are shown and estimates of the position and brightness are given. Other plates exist for which Pluto was either at the limit of detection or in the field curvature zone. Since many observatories sought to locate the emergance of Halley's comet, other plates may exist elsewhere in the world.

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