Prometheus (volcano)
Prometheus is an active volcano on Jupiter's moon Io. It is located on Io's hemisphere facing away from Jupiter at 1°31′S 153°56′W / 1.52°S 153.94°WCoordinates: 1°31′S 153°56′W / 1.52°S 153.94°W. Prometheus consists of a 28-kilometer (17 mi)-wide volcanic pit named Prometheus Patera and a 100-kilometer (62 mi)-long compound lava flow, all surrounded by reddish sulfur and circular, bright sulfur dioxide volcanic plume deposits. The volcano was first observed in images acquired by the Voyager 1 spacecraft in March 1979. Later that year, the International Astronomical Union named this feature after a Greek fire god, Prometheus.
Prometheus is the site of a volcanic eruption that has been ongoing since at least the Voyager 1 encounter in 1979. Between the Voyager encounters and the first observations by Galileo, a 6,700-square-kilometer (2,600 sq mi) flow field was emplaced. Later Galileo observations of this flow field revealed numerous small breakouts, particularly on the western end of the flow field.
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