In which year was the moon, on which the volcanic feature Reiden Patera is located, discovered ?
Io (moon) 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.
Nansen (Martian crater) Nansen Crater is a crater in the Phaethontis quadrangle of Mars, located at 50.3°S latitude and 140.6°W longitude, it is also inside Terra Sirenum. It is 81.0 km in diameter and was named after Fridtjof Nansen, and the name was approved in 1967.