Discovery images of Anthe
|Discovered by||Cassini Imaging Team |
|Discovery date||May 30, 2007|
|Orbital characteristics |
|Semi-major axis||197,700 km|
|Orbital period||1.03650 d|
|Inclination||0.1° to Saturn's equator|
|Mass||5 ×1012 kg [a]|
|Equatorial surface gravity||unknown|
|Rotation period||assumed synchronous|
Anthe (// 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.
It was discovered by the Cassini Imaging Team in images taken on May 30, 2007. 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.
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.
- Assumed density of 1.2 g/cm³
- 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. 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 web site. Retrieved 2008-09-05.
Media related to Anthe at Wikimedia Commons