Calypso (moon)
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Calypso is a natural satellite 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
Calypso image from Cassini (February 13, 2010)
Another February 13, 2010 image showing flow-like albedo features
PIA18317 Saturn Moon Tethys Cassini 20150411
Tethys (moon)
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Tethys is the fifth-largest moon of Saturn, measuring about 1,060 km across. It was discovered by Giovanni Domenico Cassini in 1684, and is named after the titan Tethys of Greek mythology.
Calypso (moon)
…2. In 1983 it was officially named after Calypso of Greek mythology. It is also designated Saturn XIV or Tethys C. Calypso is co-orbital with the moon Tethys, and resides in Tethys's trailing Lagrangian point (L5), 60 degrees behind Tethys. This relationship was first identified by Seidelmann et al. in 1981…
Tethys imaged by the Cassini orbiter, October 2009
Giovanni Domenico Cassini, discoverer of Tethys
Tethys – Red Arcs (11 April 2015)
Cassini view of Tethys's Saturn-facing hemisphere, showing the giant rift Ithaca Chasma, crater Telemachus at top, and smooth plains at right