Calypso (moon)

Calypso
	Calypso image from Cassini; (February 13, 2010)
Discovery
Discovered by	<templatestyles src="Plainlist/styles.css"/> Dan Pascu; P. Kenneth Seidelmann; William A. Baum; Douglas G. Currie;
Discovery date	March 13, 1980
Designations
Adjectives	Calypsonian
Orbital characteristics
Semi-major axis	294619 km
Eccentricity	0.000
Orbital period	1.887802 d
Inclination	1.56° (to Saturn's equator)
Satellite of	Saturn
Physical characteristics
Dimensions	30.2 × 23 × 14 km
Mean radius	10.7±0.7 km
Rotation period	synchronous
Axial tilt	zero
Albedo	1.34±0.10 (geometric)
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There is also an asteroid called 53 Kalypso.

Calypso (/kəˈlɪpsoʊ/ kə-LIP-soh; Greek: Καλυψώ) is a moon of Saturn. It was discovered in 1980, from ground-based observations, by Dan Pascu, P. Kenneth Seidelmann, William A. Baum, and Douglas G. Currie, and was provisionally designated S/1980 S 25 (the 25th satellite of Saturn discovered in 1980).^[4] Several other apparitions of it were recorded in the following months: S/1980 S 29, S/1980 S 30,^[5] S/1980 S 32,^[6] and S/1981 S 2.^[7] In 1983 it was officially named after Calypso of Greek mythology.^{[lower-alpha 1]} It is also designated as Saturn XIV or Tethys C.

Calypso is co-orbital with the moon Tethys, and resides in Tethys' trailing Lagrangian point (L₅), 60 degrees behind Tethys. This relationship was first identified by Seidelmann et al. in 1981.^[8] The moon Telesto resides in the other (leading) Lagrangian point of Tethys, 60 degrees in the other direction from Tethys. Calypso and Telesto have been termed "Tethys trojans", by analogy to the trojan asteroids, and are half of the four presently known trojan moons.

Like many other small Saturnian moons and small asteroids, Calypso is irregularly shaped, has overlapping large craters, and appears to also have loose surface material capable of smoothing the craters' appearance. Its surface is one of the most reflective (at visual wavelengths) in the Solar System, with a visual geometric albedo of 1.34.^[3] This very high albedo is the result of the sandblasting of particles from Saturn's E-ring, a faint ring composed of small, water-ice particles generated by Enceladus' south polar geysers.^[9]

Gallery

Another February 13, 2010 image showing flow-like albedo features
Cassini image from September 23, 2005
Calypso as seen by Voyager 2 (August 1981)

References

Notes

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Citations

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Sources

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External links

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↑ NASA Celestia^{[dead link]}
↑ ^2.0 ^2.1 Thomas 2010.
↑ ^3.0 ^3.1 Verbiscer French et al. 2007.
↑ IAUC 3496.
↑ IAUC 3549.
↑ IAUC 3605.
↑ IAUC 3593.
↑ Seidelmann Harrington et al. 1981.
↑ Mason 2010.

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[NASACelestia-1] NASA Celestia^{[dead link]}

[FOOTNOTEThomas2010-2] 2.0 ^2.1 Thomas 2010.

[FOOTNOTEVerbiscer_French_et_al.2007-3] 3.0 ^3.1 Verbiscer French et al. 2007.

[FOOTNOTEIAUC_3496-4] IAUC 3496.

[FOOTNOTEIAUC_3549-5] IAUC 3549.

[FOOTNOTEIAUC_3605-6] IAUC 3605.

[FOOTNOTEIAUC_3593-7] IAUC 3593.

[FOOTNOTESeidelmann_Harrington_et_al._1981-9] Seidelmann Harrington et al. 1981.

[FOOTNOTEMason2010-10] Mason 2010.

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[2]

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[7]

[lower-alpha 1]

[8]

[9]

v t e Moons of Saturn
Generally listed in increasing distance from Saturn. Temporary names in italics.
Ring shepherds	S/2009 S 1 Propeller moonlets Pan Daphnis Atlas Prometheus ?(S/2004 S 6 S/2004 S 4 S/2004 S 3) Pandora
Co-orbitals	Epimetheus Janus
G Ring	Aegaeon
Inner large (with trojans)	Mimas Enceladus Tethys Telesto Calypso Dione Helene Polydeuces
Alkyonides	Methone Anthe Pallene
Outer large	Rhea Titan Hyperion Iapetus
Inuit group	Kiviuq Ijiraq Paaliaq Siarnaq Tarqeq
Gallic group	Albiorix Bebhionn Erriapus Tarvos
Norse group	Phoebe Skathi S/2007 S 2 Skoll S/2004 S 13 Greip Hyrrokkin Mundilfari Jarnsaxa S/2006 S 1 S/2004 S 17 Narvi Bergelmir Aegir Suttungr S/2004 S 12 Bestla Farbauti Hati S/2004 S 7 Thrymr S/2007 S 3 S/2006 S 3 Surtur Kari Fenrir Ymir Loge Fornjot
Rings of Saturn Cassini–Huygens Themis Chiron In fiction

Calypso (moon)

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Discovery
Calypso image from Cassini (February 13, 2010)
Discovered by	<templatestyles src="Plainlist/styles.css"/> Dan Pascu P. Kenneth Seidelmann William A. Baum Douglas G. Currie
Discovery date	March 13, 1980
Designations
Adjectives	Calypsonian
Orbital characteristics
Semi-major axis	294619 km
Eccentricity	0.000
Orbital period	1.887802 d ^[1]
Inclination	1.56° (to Saturn's equator)
Satellite of	Saturn
Physical characteristics
Dimensions	30.2 × 23 × 14 km ^[2]
Mean radius	10.7±0.7 km ^[2]
Rotation period	synchronous
Axial tilt	zero
Albedo	1.34±0.10 (geometric) ^[3]
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