Astronomy:Anthe (moon)

Anthe
	Anthe is the ellipsoid in the center
Discovery
Discovered by	Cassini Imaging Team
Discovery date	May 30, 2007
Designations
Designation	Saturn XLIX
Pronunciation	/ˈænθiː/
Named after	Άνθη Anthē
Adjectives	Anthean /ænˈθiːən/
Orbital characteristics
Semi-major axis	197,700 km
Eccentricity	0.0011
Orbital period	1.05089 d
Average Orbital speed	13.824 km/s
Inclination	0.1° to Saturn's equator
Satellite of	Saturn
Group	Alkyonides
Physical characteristics
Dimensions	1.8 km
Mean radius	0.9 km
Circumference	≈ 5.7 km
Surface area	10.18 km2
Volume	3 km3
Mass	1.5×1012 kg
Mean density	0.5 g/cm3
surface gravity	0.00012 m/s2 (0.12 mm/s2)
escape velocity	≈ 0.56 m/s (≈ 2 km/h)
Rotation period	assumed synchronous

Short description: Moon of Saturn

Anthe /ˈænθiː/ 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]

The designation S/2007 S 4 was also accidentally and incorrectly used for a different Saturnian satellite discovered later. The published discovery was retracted a few hours later and republished the next day under the correct name of S/2007 S 5.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]

References

Notes

↑ This name is too new to appear in dictionaries, but the OED has the analogous rhodanthe /roʊˈdænθiː/ from the same root.

Citations

↑ ^1.0 ^1.1 Cassini Imaging Team.
↑ ^2.0 ^2.1 ^2.2 IAUC 8857.
↑ [1]^{[|permanent dead link|dead link}}]}
↑ [2]
↑ Agle 2007.
↑ Porco et al., 2008.
↑ Hedman et al., 2009.

Sources

"Cassini Imaging Science Team". Cassini Imaging Central Laboratory for OPerationS. http://ciclops.org/team/iss_team.php.
Agle, D. C. (July 19, 2007). "Saturn Turns 60". Cassini Solstice Mission. JPL/NASA. http://saturn.jpl.nasa.gov/news/cassinifeatures/feature20070719/.
Green, Daniel W. E. (July 18, 2007). "S/ 2007 S 4". IAU Circular 8857. http://www.cbat.eps.harvard.edu/iauc/08800/08857.html. 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. doi:10.1016/j.icarus.2008.11.001. ISSN 0019-1035. Bibcode: 2009Icar..199..378H.
Porco C. C. (2008-09-05). "More Ring Arcs for Saturn". Cassini Imaging Central Laboratory for Operations. http://ciclops.org/view_event/90/More_Ring_Arcs_for_Saturn.

External links

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

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Original source: https://en.wikipedia.org/wiki/Anthe (moon). Read more

[rhodanthe-2] This name is too new to appear in dictionaries, but the OED has the analogous rhodanthe /roʊˈdænθiː/ from the same root.

[FOOTNOTECassini_Imaging_Team-1] 1.0 ^1.1 Cassini Imaging Team.

[FOOTNOTEIAUC_8857-3] 2.0 ^2.1 ^2.2 IAUC 8857.

[4] [1]^{[|permanent dead link|dead link}}]}

[5] [2]

[FOOTNOTEAgle2007-6] Agle 2007.

[FOOTNOTEPorco_et_al.,_2008-7] Porco et al., 2008.

[FOOTNOTEHedman_et_al.,_2009-8] Hedman et al., 2009.

[1]

[lower-alpha 1]

[2]

[3]

[4]

[5]

[6]

[7]

v t e Moons of Saturn
Listed in approximately increasing distance from Saturn.
Ring shepherds	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus Pandora
Co-orbitals	Epimetheus Janus
G Ring	Aegaeon
Alkyonides	Methone Anthe Pallene
Inner large (with trojans)	Mimas Enceladus Tethys Telesto Calypso Dione Helene Polydeuces
Outer large	Rhea Titan Hyperion Iapetus
Inuit group	Kiviuq Ijiraq Paaliaq S/2004 S 29 S/2004 S 31 Siarnaq Tarqeq
Norse group	Phoebe Skathi S/2004 S 37 S/2007 S 2 Skoll S/2004 S 13(?) Greip Hyrrokkin Jarnsaxa Mundilfari S/2006 S 1 S/2004 S 17(?) Bergelmir Narvi S/2004 S 20 Suttungr Hati S/2004 S 12(?) S/2004 S 27 Farbauti Thrymr S/2004 S 30 Aegir S/2007 S 3(?) Bestla S/2004 S 7(?) S/2004 S 22(?) S/2004 S 23(?) S/2004 S 25(?) S/2004 S 32(?) S/2006 S 3 S/2004 S 38(?) Fenrir S/2004 S 28(?) Surtur Kari S/2004 S 35(?) Ymir S/2004 S 21(?) Loge S/2004 S 36(?) S/2004 S 39(?) S/2004 S 33(?) S/2004 S 34(?) Fornjot S/2004 S 26(?)
Gallic group	Albiorix Bebhionn Erriapus Tarvos
Prograde outer satellites	S/2004 S 24
Rings of Saturn Cassini–Huygens Themis Chiron S/2004 S 6 S/2004 S 4 S/2004 S 3 In fiction

v t e Saturn
Outline of Saturn
Geography	Dragon Storm Great White Spot Hexagon Magnetosphere Rings
Moons	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus S/2004 S 6 S/2004 S 4 S/2004 S 3 Pandora Epimetheus Janus Aegaeon Mimas Methone Anthe Pallene Enceladus Tethys Telesto Calypso Dione Helene Polydeuces Rhea Titan Hyperion Iapetus Kiviuq Ijiraq Phoebe Paaliaq Skathi S/2004 S 37 Albiorix S/2007 S 2 S/2004 S 29 Bebhionn Erriapus Skoll S/2004 S 31 Siarnaq Tarqeq S/2004 S 13 Greip Hyrrokkin Jarnsaxa Tarvos Mundilfari S/2006 S 1 S/2004 S 17 Bergelmir Narvi S/2004 S 20 Suttungr Hati S/2004 S 12 S/2004 S 27 Farbauti Thrymr S/2004 S 30 Aegir S/2007 S 3 Bestla S/2004 S 7 S/2004 S 22 S/2004 S 23 S/2004 S 25 S/2004 S 32 S/2006 S 3 S/2004 S 38 Fenrir S/2004 S 28 Surtur Kari S/2004 S 35 Ymir S/2004 S 21 S/2004 S 24 Loge S/2004 S 36 S/2004 S 39 S/2004 S 33 S/2004 S 34 Fornjot S/2004 S 26
Astronomy	Delta Octantis Saturn-crossing minor planets
Exploration	Cassini–Huygens (Huygens) timeline retirement Pioneer 11 Voyager program Voyager 1 Voyager 2
Related	Fiction Moons The Day the Earth Smiled In Saturn's Rings (2018 documentary)

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Discovery
Anthe is the ellipsoid in the center
Discovered by	Cassini Imaging Team ^[1]
Discovery date	May 30, 2007
Designations
Designation	Saturn XLIX
Pronunciation	/ˈænθiː/^{[lower-alpha 1]}
Named after	Άνθη Anthē
Adjectives	Anthean /ænˈθiːən/
Orbital characteristics ^[2]
Semi-major axis	197,700 km
Eccentricity	0.0011
Orbital period	1.05089 d
Average Orbital speed	13.824 km/s
Inclination	0.1° to Saturn's equator
Satellite of	Saturn
Group	Alkyonides
Physical characteristics
Dimensions	1.8 km ^[3]
Mean radius	0.9 km
Circumference	≈ 5.7 km
Surface area	10.18 km²
Volume	3 km³
Mass	1.5×10¹² kg^[4]
Mean density	0.5 g/cm³
surface gravity	0.00012 m/s² (0.12 mm/s²)
escape velocity	≈ 0.56 m/s (≈ 2 km/h)
Rotation period	assumed synchronous

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