Masubi (volcano)
Masubi is an active volcano on Jupiter's moon Io. It is located on Io's leading hemisphere at 49°36′S 56°11′W / 49.6°S 56.18°WCoordinates: 49°36′S 56°11′W / 49.6°S 56.18°W within a bright terrain region named Tarsus Regio. 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 also notable for having one of the largest active lava flows on Io, with an additional 240 km (150 mi) flow forming between 1999 and 2007.
The volcano was first observed during the Voyager 1 encounter with the Jupiter system on March 5, 1979. 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. 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. 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. 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. This was the faintest of the plumes on Io observed by the two Voyager spacecraft. 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. The lava flow associated with the plume was named Masubi Fluctus shortly after the start of the Galileo mission.
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