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Methone: Overview
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Black and white image of egg-shaped moon.
The view was obtained by the Cassini spacecraft at a distance of approximately 4,000 km (2,500 miles) from Methone and at a sun-Methone-spacecraft, or phase, angle of 63 degrees. Scale in the original image was 27 m (88 feet) per pixel. The image has been magnified by a factor of 2.

Methone (pronounced me-thoh-nee; adjective: Methonean) is a tiny 3-km (2-mile) diameter moon that orbits between Mimas and Enceladus at a radius of 194,000 km (120,546 miles) from Saturn. Scientists have two theories to explain the presence of Methone and two other tiny sister moons, Pallene and Anthe. First, the three moons may have split from either Mimas or Enceladus. Second, all five moons may be the remains of a larger swarm that traveled in that area close to Saturn.

Methone orbits Saturn in 24 hours. The three tiny moons, Methone, Pallene and Anthe, all orbit at very similar distances from Saturn -- they are in a dynamical relationship. Mimas strongly perturbs the three moons, all of which orbit between Mimas and Enceladus. The vastly more massive Mimas causes the Methonean orbit to vary by as much as 20 km (12.4 miles), it causes Pallene to vary by a slightly smaller amount and it has the greatest effect on Anthe.

These three moons may also be contributing particles to Saturn's E-ring. The moons are small and were only recently discovered. Consequently, astronomers have few details on characteristics of these moons such as reflectivity (albedo), rotation (probably tidally locked on Saturn because they are so close) and composition.

Discovery:
The Cassini Imaging Team discovered Methone on 1 June 2004. Methone and nearby Pallene were the first moons discovered in Cassini images.

How Methone Got its Name:
John Herschel suggested that the moons of Saturn be associated with the mythical brothers and sisters of Kronus. (Kronus is the equivalent of the Roman god Saturn in Greek mythology.)

The name Methone comes from the name in Greek mythology of one of seven Alkyonides -- daughters of the god (or Titan) Alkyoneus. Alkyoneus sprang from Gaea and the blood of Uranus. This blood was spilled when Uranus' son -- and Alkyoneus' brother -- Kronus castrated his father. Herakles (Hercules) killed Alkyoneus in the war between the gods of Mount Olympus and the Titans. Overcome by grief, the daughters threw themselves into the sea to die, but the goddess Amphitrite took pity on them and transformed them into halcyons or kingfishers.

Astronomers also refer to Methone as Saturn XXXII or S/2004 S1. The International Astronomical Union now controls the official naming of astronomical bodies.

Just the Facts
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Mass:  8.9920 x 1012 kg
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Last Updated: 12 Aug 2013