Reiden Patera is a volcanic feature on Jupiter

Jupiter

Jupiter is the fifth planet from the Sun and the largest planet within the Solar System. It is a gas giant with mass one-thousandth that of the Sun but is two and a half times the mass of all the other planets in our Solar System combined. Jupiter is classified as a gas giant along with Saturn,...

's moon Io

Io (moon)

Io ) is the innermost of the four Galilean moons of the planet Jupiter and, with a diameter of , the fourth-largest moon in the Solar System. It was named after the mythological character of Io, a priestess of Hera who became one of the lovers of Zeus....

. It was first detected by the Galileo SSI Team during the spacecraft Galileo's first orbit around Jupiter, initially detected as a hotspot

Hotspot (geology)

The places known as hotspots or hot spots in geology are volcanic regions thought to be fed by underlying mantle that is anomalously hot compared with the mantle elsewhere. They may be on, near to, or far from tectonic plate boundaries. There are two hypotheses to explain them...

. It was once thought that the activity there had stopped or waned below the limits of the spacecraft's Solid State Imager or Near-Infrared Mapping Spectrometer. However, it was noticed in 2002 that Reiden Patera has darkened considerably since the 24th orbit of Galileo. It has been spouting bright red pyroclastic deposits

Pyroclastic flow

A pyroclastic flow is a fast-moving current of superheated gas and rock , which reaches speeds moving away from a volcano of up to 700 km/h . The flows normally hug the ground and travel downhill, or spread laterally under gravity...

 of its own. It is located at 13.4°S 235.45°W and is 70 kilometers in diameter. It is named after a Japan

Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

ese thunder god. Asha Patera

Asha Patera

Asha Patera is a patera, or a complex crater with scalloped edges, on Jupiter's moon Io. It is approximately 108 kilometers in diameter and located at . It is named after asha, the Zoroastrian principle of Truth. Its name was adopted by the International Astronomical Union in 1979. Reiden Patera...

 can be found to the east, and Kami-Nari Patera

Kami-Nari Patera

Kami-Nari Patera is a patera, or a complex crater with scalloped edges, on Jupiter's moon Io. It is approximately 53 kilometers in diameter and is located at . It is named after the Japanese god of rolling thunder, Kami-Nari. Its name was adopted by the International Astronomical Union in 2000....

can be found to the north.