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Anthe (moon)

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Anthe N1832831075 1.jpg
Anthe is the ellipsoid in the center
Discovered by Cassini Imaging Team [1]
Discovery date May 30, 2007
Orbital characteristics[2]
197,700 km
Eccentricity 0.0011
1.05089 d
Inclination 0.1° to Saturn's equator
Satellite of Saturn
Physical characteristics
Dimensions 1.8 km [3]
Circumference ≈ 5.7km
Volume 3km³
Mass 1.5×1012 kg[4]
Mean density
0.00012m/s² (0.12mm/s²)
≈ 0.56m/s (≈ 2km/h)
assumed synchronous

Anthe (/ˈænθ/ AN-thee;[a] Greek: Άνθη) is a very small natural satellite of Saturn lying between the orbits of Mimas and Enceladus. It is also known as Saturn XLIX; its provisional designation was S/2007 S 4. It is named after one of the Alkyonides; the name means flowery. It is the sixtieth confirmed moon of Saturn.[5]

It was discovered by the Cassini Imaging Team[1] in images taken on 30 May 2007.[2] Once the discovery was made, a search of older Cassini images revealed it in observations from as far back as June 2004. It was first announced on 18 July 2007.[2]

Discovery images of Anthe

Anthe is visibly affected by a perturbing 10:11 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 on a timescale of about 2 Earth years. The close proximity to the orbits of Pallene and Methone suggests that these moons may form a dynamical family.

Material blasted off Anthe by micrometeoroid impacts is thought to be the source of the Anthe Ring Arc, a faint partial ring about Saturn co-orbital with the moon first detected in June 2007.[6][7]


  1. ^ This name is too new to appear in dictionaries, but the OED has the analogous rhodanthe /roʊˈdænθiː/.

External links[edit]

Media related to Anthe at Wikimedia Commons