Anthe (moon)

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Anthe
S2007 S 4 PIA08369.gif
Discovery
Discovered by Cassini Imaging Team [1]
Discovery date May 30, 2007
Orbital characteristics[2]
197,700 km
Eccentricity 0.001
1.03650 d
Inclination 0.1° to Saturn's equator
Satellite of Saturn
Physical characteristics
Mass 5 ×1012 kg [a]
Mean density
unknown
unknown
assumed synchronous
unknown
Albedo unknown

Anthe (/ˈænθ/ AN-thee;[b] 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.[3]

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

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 believed to the source of the Anthe Ring Arc, a faint partial ring about Saturn co-orbital with the moon first detected in June 2007.[4][5]

References[edit]

Explanatory

  1. ^ Assumed density of 1.2 g/cm³
  2. ^ This name is too new to appear in dictionaries, but the OED has the analogous rhodanthe /roʊˈdænθiː/.

Citations

Sources

External links[edit]

Media related to Anthe at Wikimedia Commons