Telesto is a moon of Saturn. It was discovered by Smith, Reitsema, Larson and Fountain in 1980 from ground-based observations, and was provisionally designated . In the following months, several other apparitions were observed: , , and . In 1983 it was officially named after Telesto of Greek mythology. It is also designated as or Tethys B. Telesto is co-orbital with Tethys, residing in Tethys' leading Lagrangian point (). This relationship was first identified by Seidelmann et al. in 1981. Another moon, Calypso, resides in the other (trailing) Lagrangian point of Tethys, 60 degrees in the other direction from Tethys. The Saturnian system has two additional trojan moons. Exploration The Cassini probe performed a distant flyby of Telesto on October 11, 2005. The resulting images show that its surface is surprisingly smooth, devoid of small impact craters. Citations References External links NASA - Telesto Profile NASA's Solar System Exploration The Planetary Society: Telesto Moons of Saturn Trojan moons 19800408 Moons with a prograde orbit