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S2004s1 040601
Discovery image of Methone

Discovered by Sébastien Charnoz as part of

Cassini Imaging Science Team

Discovered on 1 June, 2004
Orbital characteristics [1]
Epoch 20 June 2004 (JD 2453177.5)
Semimajor axis 194,440 ± 20 km
Eccentricity 0.0001
Orbital period 1.009573975 d
(to Saturn's equator)
0.007 ± 0.003°
Is a satellite of Saturn
Physical characteristics
Mean diameter ≈ 3 km
Mass 0.7 − 3 ×1013 kg[2]
Mean density unknown
Surface gravity unknown
Rotation period synchronous
Axial tilt unknown
Albedo unknown
Atmosphere none

Methone (me-thoe'-nee, IPA /məˈθoʊni/, Greek Μεθωνη) is a very small natural satellite of Saturn lying between the orbits of Mimas and Enceladus.

It was discovered by Sébastien Charnoz, member of Cassini imaging scientists team led by Carolyn C. Porco, et al. in 2004, and given the temporary designation S/2004 S 1. Methone is also named Saturn XXXII.

Methone is visibly affected by a perturbing mean longitude resonance with the much larger Mimas. This causes its osculating orbital elements to vary with an amplitude of about 20 km in semi-major axis, and 5° in longitude on a timescale of about 450 days. Eccentricity also varies on different timescales between 0.0011 and 0.0037, and inclination between about 0.003° and 0.020° [1].

The name Methone was approved by the IAU Working Group on Planetary System Nomenclature on January 21, 2005. It should be officially approved at the IAU General Assembly in 2006. Methone was one of the Alkyonides, the seven beautiful daughters of the Giant Alkyoneus.

External links


  1. 1.0 1.1 J.N. Spitale et al (2006). "The orbits of Saturn's small satellites derived from combined historic and Cassini imaging observations". The Astronomical Journal 132: 692.
  2. Based on density 0.5 - 2 g/cm³

... | Narvi | Methone | Pallene | ...

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