Question: In which year was the moon, on which the volcanic feature Reiden Patera is located, discovered ? 

Context articles: Ah Peku Patera
Io (moon)
Kami-Nari Patera
Asha Patera
Amaterasu Patera
Reiden Patera
Thomagata Patera
Svarog Patera
Chaac-Camaxtli region
Pillan Patera

Ah Peku Patera is a patera, or a complex crater with scalloped edges, on Jupiter's moon Io.
 It is 84 kilometers in diameter and is located at .
 It is named after the Mayan thunder god Ah Peku.
 Its name was adopted by the International Astronomical Union in 2006.
 Ah Peku Patera is located on the south end of Monan Mons, north of which is Monan Patera.
 The eruptive centers Amirani and Maui can be found northwest, as well as Maui Patera.
 Gish Bar Patera is located toward the northeast.
 Ah Peku Patera was first detected by the spacecraft Galileo's Solid State Imager and Near-Infrared Mapping Spectrometer.
 It is considered an active hot spot.
Io (Jupiter I) is the innermost of the four Galilean moons of the planet Jupiter.
 It is the fourth-largest moon, has the highest density of all the moons, and has the least amount of water of any known astronomical object in the Solar System.
 It was discovered in 1610 and was named after the mythological character Io, a priestess of Hera who became one of Zeus's lovers.
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.
 Reiden Patera can be found to the south, and Asha Patera can be found to the east.
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 and Kami-Nari Patera can both be found to the west.
Amaterasu Patera is a patera, or a complex crater with scalloped edges, on Jupiter's moon Io.
 Its temperature was estimated on March 5, 1979, to be around 281 kelvins.
 It is one of the darkest features on Io, and the measurement of its thermal spectrum helped to support an anticorrelation established between albedo and temperature for Ionian hotspots.
 The feature has darkened further since the first orbit around Jupiter by the "Galileo" spacecraft.
 It is 100 kilometers in diameter and located at .
 It was named after the Japanese sun goddess Amaterasu.
 To the north are Kinich Ahau Patera and Dazhbog Patera, and to the west are Manua Patera and Fuchi Patera.
Reiden Patera is a volcanic feature on Jupiter's moon Io.
 It was first detected by the "Galileo" SSI Team during the spacecraft Galileo's first orbit around Jupiter, initially detected as a hotspot.
 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 of its own.
 It is located at and is 70 kilometers in diameter.
 It is named after a Japanese thunder god ("Raijin" in current English nomenclature).
 Asha Patera can be found to the east, and Kami-Nari Patera can be found to the north.
Thomagata Patera is a volcano on Jupiter's moon Io.
 It is located on Io's anti-Jupiter hemisphere at , to the east of the nearby active volcanoes Volund and Zamama.
 Thomagata is a kidney-shaped Ionian patera, a type of volcanic crater similar to a caldera, 56 km long, 26 km wide, and 1.2 - deep.
 The volcano is currently inactive as a thermal hotspot has never been observed at Thomagata and the bright floor of the patera suggests that it is cold enough for sulfur dioxide and sulfur to condense.
 Thomagata is located near the center of a low, 100 km wide mesa.
 The edge of the mesa rises 200 m above the surrounding plains, however the slope up to the edge of Thomagata Patera is unknown.
 If the floor of the patera is at the same level as the surrounding plains, the western slope of the mesa would have a grade of 2°.
 The morphology of this mesa and the pattern of faded lava flows along its slopes radiating away from Thomagata (at least on its eastern side) suggest that Thomagata Patera and the mesa that surrounds it may be a shield volcano, also called a "tholus" on Io.
 The irregular margin of the mesa and the lack of debris at the base of its basal scarp suggest that it was modified by sulfur dioxide sapping.
Svarog Patera is a patera, or a complex crater with scalloped edges, on Jupiter's moon Io.
 It is 124 kilometers in diameter and is located at .
 It is named after the Russian smith god Svarog.
 Its name was approved by the International Astronomical Union in 1979.
 North of Svarog Patera is Lyrcea Planum, north of which is Babbar Patera.
 To the south is Silpium Mons, and to the east is Hermes Mensa.
 To the southeast are Pyerun Patera and Epaphus Mensa.
 Svarog Patera is a Voyager spacecraft-detected hot spot.
The Chaac-Camaxtli region is a volcanic region on Jupiter's moon Io, located from approximately 5 to 20°N and 130 to 160°W in its anti-Jovian hemisphere.
 It consists mainly of the hummocky bright plains that occupy the surface.
 This area is defined on the west by Chaac Patera, and on the east by Camaxtli Patera.
 At least 10 distinct volcanic centers are located in the region, making it a volcanically active region on Io's surface.
 Most of the volcanism here is expressed as paterae, which range in size from circular to elliptical.
 A patera is defined by the International Astronomical Union as "irregular or complex craters with scalloped edges."
 The largest volcanic structure here is the Chaac Patera (105 km X 48 km).
 The paterae found in the Chaac-Camaxtli region are Chaac, Balder Patera, Grannos, Ababinili, Ruaumoko, Steropes, Camaxtli, Tien Mu, Utu, and Mentu.
Pillan Patera is a patera, or a complex crater with scalloped edges, on Jupiter's moon Io.
 It is located at , south of Pillan Mons and west of Reiden Patera.
 It is named after the Araucanian thunder, fire, and volcano god.
 Its name was approved by the International Astronomical Union in 1997.