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John Spencer of Lowell Observatory maintains a Summary of Known Io Volcanic Activity, Early 1995 - Present. It includes short summaries of activity and identification of the vent. This image shows a plume from Pele with Jupiter in the background. The image was taken by the Hubble Space Telescope on July, 24, 1997. Observers: Spencer, McEwen, McGrath, Sartoretti, Nash, Clarke, Ballester, Trauger.