Anthe (moon)

Anthe /ˈænθ/ 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]

Anthe N1832831075 1.jpg
Anthe is the ellipsoid in the center
Discovered byCassini Imaging Team [1]
Discovery dateMay 30, 2007
Saturn XLIX
Named after
Άνθη Anthē
AdjectivesAnthean /ænˈθən/
Orbital characteristics[2]
197,700 km
1.05089 d
13.824 km/s
Inclination0.1° to Saturn's equator
Satellite ofSaturn
Physical characteristics
Dimensions1.8 km [3]
Mean radius
0.9 km
Circumference≈ 5.7 km
10.18 km²
Volume3 km³
Mass1.5×1012 kg[4]
Mean density
0.5 g/cm³
0.00012 m/s² (0.12mm/s²)
≈ 0.56 m/s (≈ 2km/h)
assumed synchronous

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/ from the same root.
  • "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. Archived from the original on February 20, 2012. Retrieved 2012-01-01.CS1 maint: ref=harv (link)
  • 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. doi:10.1016/j.icarus.2008.11.001. ISSN 0019-1035.
  • Porco C. C., [ et al.] (2008-09-05). "More Ring Arcs for Saturn". Cassini Imaging Central Laboratory for Operations. Retrieved 2008-09-05.

External linksEdit

  Media related to Anthe at Wikimedia Commons