Calypso (moon)
Dan Pascu, P. Kenneth Seidelmann, William A. Baum, and Douglas G. Currie spotted Calypso in 1980 through ground-based observations. It became the twenty-fifth satellite of Saturn discovered that year. Astronomers assigned it a provisional designation during its initial detection window. Several other appearances of the moon appeared in the following months throughout early spring. The International Astronomical Union officially named the object Calypso in 1983 after a figure from Greek mythology. Scientists also refer to this body as Tethys C or S/1980 S 24.
Calypso shares an orbit with the larger moon Tethys around Saturn. It resides at Tethys's trailing Lagrangian point sixty degrees behind the parent moon. This gravitational relationship first emerged in analysis by Seidelmann et al. in 1981. Another moon called Telesto occupies the leading Lagrangian point on the opposite side. These two bodies function as Tethys trojans similar to asteroids sharing Jupiter's path. They represent half of the four known trojan moons currently identified in the solar system.
The surface of Calypso reflects light more intensely than almost any other object in the solar system. Its visual geometric albedo measures 1.34 at visible wavelengths. This extreme brightness results from sandblasting particles originating from Saturn's E-ring. Those faint ring particles consist of water ice generated by geysers erupting from Enceladus's south pole. The moon itself holds an irregular shape covered in overlapping large craters. Loose surface material exists capable of smoothing the cratered appearance over time.
Geological features include multiple overlapping large craters scattered across the terrain. Space weathering processes generate loose surface material that accumulates around these depressions. This regolith layer softens the sharp edges of impact sites. The resulting landscape appears smoother than expected for a body of this size. Observations confirm the presence of fine dust covering much of the ground. Such conditions suggest ongoing modification of the surface environment.
Data collected during the Cassini spacecraft flyby provided detailed imagery of physical characteristics. An animation of photos taken on the 13th of February 2010 captured the moon's rotation. Raw images released after the encounter revealed texture and topography previously unseen. These observations helped scientists understand the relationship between the moon and its parent planet. The mission confirmed details about the irregular shape and surface reflectivity. Future studies rely heavily on the data gathered during this specific orbital pass.
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Common questions
Who discovered Calypso in 1980?
Dan Pascu, P. Kenneth Seidelmann, William A. Baum, and Douglas G. Currie spotted Calypso in 1980 through ground-based observations.
When did the International Astronomical Union officially name Calypso?
The International Astronomical Union officially named the object Calypso in 1983 after a figure from Greek mythology.
Where is Calypso located relative to Tethys?
Calypso resides at Tethys's trailing Lagrangian point sixty degrees behind the parent moon.
What causes the extreme brightness of Calypso surface?
Its visual geometric albedo measures 1.34 at visible wavelengths due to sandblasting particles originating from Saturn's E-ring.
How many known trojan moons exist in the solar system according to the text?
These two bodies represent half of the four known trojan moons currently identified in the solar system.