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Anthe (moon)

Discovery images of Anthe
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 [1]
Mean density
assumed synchronous
Albedo unknown

Anthe ( ;[2] 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]



  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/.



  • "Cassini Imaging Science Team". Cassini Imaging Central Laboratory for OPerationS. Retrieved 2012-01-01. 
  • Agle, D. C. (July 19, 2007). "Saturn Turns 60". Cassini Solstice Mission. JPL/NASA. Retrieved 2012-01-01. 
  • Green, Daniel W. E. (July 18, 2007). "S/ 2007 S 4". IAU Circular 8857. Retrieved 2012-01-01. 
  • Hedman, M. M.; Murray, C. D.; Cooper, N. J.; Tiscareno, M. S.; Beurle, K.; Evans, M. W.; Burns, J. A. (2008-11-25). "Three tenuous rings/arcs for three tiny moons". Icarus 199 (2): 378–386. Bibcode:2009Icar..199..378H. ISSN 0019-1035. doi:10.1016/j.icarus.2008.11.001. 
  • Porco C. C., et al. (2008-09-05). "More Ring Arcs for Saturn". Cassini Imaging Central Laboratory for Operations web site. Retrieved 2008-09-05. 

External links

Media related to at Wikimedia Commons

  • From Dark Obscurity... A Tiny New Saturnian Moon Comes To Light
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