It was initially designated as Plume 8, but in 1979 the International Astronomical Union formally named it Masubi, after a Japanese fire god called Ho-Masubi. This was the faintest of the plumes on Io observed by the two Voyager spacecraft. The two-lobed shape of the plume deposit may result from the Masubi volcanic plume during Voyager 1 encounter having two sources on the flow field and two eruption columns. These images reveal a lava flow with a V-shaped northern end, associated with the plume source as noted by the dark plume deposit ring surrounding it, and bifurcated southern section. To date, images taken by Voyager 1's Imaging Science Sub-system Wide-Angle Camera shortly before the spacecraft's closest approach to Io have the highest spatial resolution coverage of this volcano at two kilometers per pixel. Voyager discovered a 64 km (40 mi) tall, 177 km (110 mi) wide volcanic dust plume, composed primarily of sulfur dioxide, at the northern end of a 501 km (311 mi) long dark lava flow. The volcano was first observed during the Voyager 1 encounter with the Jupiter system on March 5, 1979. Masubi is also notable for having one of the largest active lava flows on Io, with an additional 240 km (150 mi) flow forming between 19. A volcanic plume has been observed at Masubi by various spacecraft starting with Voyager 1 in 1979, though it has not been persistent like similar Ionian volcanoes Amirani and Prometheus. Masubi is an active volcano on Jupiter's moon Io. Highest resolution image of the Masubi volcanic lava flow.
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