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Telesto (moon)

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Trojan moon of Saturn

Telesto
Discovery
Telesto as seen by theCassini probe on 11 October 2005
Discovered by	Bradford A. Smith Harold Reitsema Stephen M. Larson John W. Fountain
Discovery date	April 8, 1980
Designations
Designation	Saturn XIII
Pronunciation	/təˈlɛstoʊ/
Named after	ΤελεστώTelestō
Alternative names	Tethys B S/1980 S 13
Adjectives	Telestoan/tɛləˈstoʊ.ən/ orTelestoian/tɛləˈstoʊ.iən/
Orbital characteristics
Semi-major axis	295000 km^[1]
Eccentricity	0.001^[1]
Orbital period (sidereal)	1.887802 d^[1]
Inclination	1.19° (to Saturn's equator)
Satellite of	Saturn
Group	L₄ Tethys trojan
Physical characteristics
Dimensions	33.2 × 23.4 × 19.2 km (± 0.6 × 0.6 × 0.4 km)^[2]^: 2
Mean diameter	24.6±0.6 km^[2]^: 2
Volume	7795 km³^[a]
Mass	≈ 4×10¹⁵ kg (assumed; unmeasured)^[b]
Meandensity	≈ 0.5 g/cm³ (assumed; unmeasured)^[2]^: 3
Surface gravity	≈ 0.0011–0.0014 m/s²^[2]^: 3
Escape velocity	≈ 0.006 km/s at longest axis to ≈ 0.007 km/s at poles
Axial tilt	zero
Apparent magnitude	18.7^[3]

Telesto/təˈlɛstoʊ/ is amoon ofSaturn. It was discovered bySmith,Reitsema,Larson andFountain in 1980 from ground-based observations, and was provisionally designatedS/1980 S 13.^[4] In the following months, several other apparitions were observed:S/1980 S 24,^[5]S/1980 S 33,^[6] andS/1981 S 1.^[7]

In 1983 it was officially named afterTelesto ofGreek mythology.^[c] It is also designated asSaturn XIII orTethys B.

Telesto is co-orbital withTethys, residing in Tethys's leadingLagrangian point (L₄). This relationship was first identified bySeidelmannet al. in 1981.^[8] 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 additionaltrojan moons.

Exploration

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TheCassini probe performed a distant flyby of Telesto on October 11, 2005. The resulting images show that its surface is surprisingly smooth, devoid of smallimpact craters.

Notes

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^Calculated from Telesto's volume-equivalent sphere radius of12.3±0.3 km given by Thomas et al. (2020)^[2]^: 2
^Calculated by multiplying Telesto's volume with its assumed density of500 kg/m³.
^ Transactions of the International Astronomical Union, Vol. XVIIIA, 1982 (confirms Janus, names Epimetheus, Telesto, Calypso) (mentioned inIAUC 3872)

References

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Citations

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^^a ^b ^c"Planetary Satellite Mean Orbital Parameters".Jet Propulsion Laboratory. Retrieved5 June 2023.
^^a ^b ^c ^d ^eThomas & Helfenstein 2020.
^Hamilton.
^IAUC 3466.
^IAUC 3484.
^IAUC 3605.
^IAUC 3593.
^Seidelmann Harrington et al. 1981.

Sources

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Hamilton, Calvin J."Saturn's Trojan Moon Telesto".SolarViews.com. SolarViews. Retrieved2011-12-23.
Marsden, Brian G. (April 10, 1980)."Satellites of Saturn"(discovery).IAU Circular (3466). Retrieved2011-12-23.
Marsden, Brian G. (June 6, 1980)."Satellites of Saturn".IAU Circular (3484). Retrieved2011-12-23.
Marsden, Brian G. (April 16, 1981)."Satellites of Saturn".IAU Circular (3593). Retrieved2011-12-23.
Marsden, Brian G. (May 18, 1981)."Satellites of Saturn".IAU Circular (3605). Retrieved2011-12-23.
Marsden, Brian G. (September 30, 1983)."Satellites of Jupiter and Saturn".IAU Circular (3872). Retrieved2011-12-23.
Seidelmann, P. K.; Harrington, R. S.; Pascu, D.; Baum, W. A.; Currie, D. G.; Westphal, J. A.; Danielson, G. E. (1981). "Saturn satellite observations and orbits from the 1980 ring plane crossing".Icarus.47 (2): 282.Bibcode:1981Icar...47..282S.doi:10.1016/0019-1035(81)90172-X.
Thomas, P. C. (July 2010)."Sizes, shapes, and derived properties of the saturnian satellites after the Cassini nominal mission"(PDF).Icarus.208 (1):395–401.Bibcode:2010Icar..208..395T.doi:10.1016/j.icarus.2010.01.025. Archived fromthe original(PDF) on 2011-09-27. Retrieved2015-09-04.
Thomas, P. C.; Helfenstein, P. (July 2020). "The small inner satellites of Saturn: Shapes, structures and some implications".Icarus.344: 20.Bibcode:2020Icar..34413355T.doi:10.1016/j.icarus.2019.06.016.S2CID 197474587. 113355.

External links

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Moons of Saturn

Listed in approximate increasing distance from Saturn

Ring moonlets

Ring shepherds

Alkyonides

Large moons
(withtrojans)

Inuit group (36)

Kiviuq subgroup (20)	S/2023 S 1 S/2019 S 1 S/2004 S 54 S/2004 S 55 S/2020 S 11 S/2019 S 22 Kiviuq S/2023 S 2 S/2019 S 23 S/2020 S 12 S/2005 S 4 S/2019 S 25 S/2020 S 1 Ijiraq S/2019 S 24 S/2007 S 10 S/2019 S 26 S/2020 S 13 S/2023 S 6 S/2023 S 7
Paaliaq	Paaliaq
Siarnaq subgroup (15)	S/2004 S 31 S/2023 S 19 S/2023 S 3 S/2020 S 19 Tarqeq S/2019 S 14 Siarnaq S/2019 S 32 S/2020 S 3 S/2005 S 6 S/2019 S 6 S/2004 S 58 S/2006 S 23 S/2020 S 5 S/2023 S 22

Gallic group (17)

Albiorix
S/2020 S 15
Bebhionn
S/2007 S 8
Saturn LX
S/2019 S 29
S/2023 S 18
S/2023 S 17
S/2007 S 11
Erriapus
S/2019 S 31
Tarvos
S/2020 S 4
S/2019 S 34
S/2005 S 7
S/2006 S 12
S/2004 S 24

Norse group (197)

Low-inclination (12)	S/2023 S 38 Skathi S/2020 S 17 S/2023 S 20 S/2023 S 30 Hyrrokkin Narvi S/2019 S 37 Bestla S/2019 S 11 S/2020 S 27 S/2023 S 46
Kari subgroup (15)	S/2006 S 1 S/2004 S 45 S/2023 S 27 S/2006 S 3 S/2023 S 33 S/2020 S 30 Kari Geirrod S/2019 S 17 S/2019 S 19 S/2019 S 18 S/2004 S 21 S/2004 S 36 S/2019 S 20 S/2006 S 29
Mundilfari subgroup (143)	S/2023 S 50 S/2023 S 9 S/2004 S 56 S/2023 S 8 S/2023 S 11 S/2006 S 21 S/2006 S 22 S/2023 S 13 S/2023 S 10 S/2023 S 12 S/2007 S 5 S/2007 S 7 S/2004 S 37 S/2004 S 47 S/2004 S 40 S/2020 S 14 S/2019 S 27 S/2023 S 14 S/2020 S 16 S/2023 S 16 S/2019 S 3 S/2020 S 7 S/2019 S 28 Skoll S/2019 S 30 S/2023 S 21 S/2023 S 4 S/2020 S 18 S/2020 S 2 S/2019 S 4 S/2020 S 20 S/2004 S 41 S/2004 S 57 S/2006 S 24 S/2004 S 42 S/2023 S 15 S/2023 S 24 S/2004 S 13 S/2007 S 6 S/2019 S 35 S/2006 S 25 Mundilfari S/2006 S 26 S/2019 S 33 S/2023 S 23 S/2020 S 21 S/2004 S 43 S/2006 S 10 S/2019 S 5 S/2023 S 25 S/2004 S 59 S/2006 S 27 Gridr Bergelmir Jarnsaxa S/2023 S 44 S/2020 S 22 S/2004 S 44 Hati S/2004 S 17 S/2004 S 12 S/2020 S 23 Eggther S/2023 S 28 S/2023 S 37 S/2023 S 26 S/2019 S 36 S/2006 S 13 S/2023 S 48 S/2023 S 29 S/2007 S 9 Farbauti S/2019 S 9 S/2023 S 32 S/2020 S 24 Aegir S/2019 S 10 Beli S/2023 S 31 S/2020 S 25 S/2023 S 34 S/2023 S 39 S/2019 S 12 S/2004 S 61 S/2006 S 14 S/2023 S 40 Gunnlod S/2019 S 15 S/2020 S 6 S/2020 S 26 S/2023 S 41 S/2004 S 7 S/2005 S 5 S/2006 S 16 S/2023 S 49 S/2006 S 15 S/2023 S 42 S/2004 S 28 S/2020 S 32 S/2020 S 8 S/2020 S 28 S/2019 S 38 S/2004 S 48 S/2023 S 36 S/2023 S 35 S/2020 S 29 Fenrir S/2004 S 50 S/2006 S 17 S/2004 S 49 S/2020 S 34 S/2020 S 31 S/2023 S 43 Surtur S/2006 S 18 S/2020 S 36 Loge S/2020 S 33 S/2004 S 39 S/2019 S 16 S/2004 S 53 S/2023 S 45 Thiazzi S/2020 S 38 S/2020 S 40 S/2019 S 40 S/2019 S 42 Saturn LXIV S/2020 S 39 S/2019 S 41 Fornjot S/2023 S 47 S/2004 S 51 S/2020 S 10 S/2020 S 42 S/2020 S 9 S/2023 S 5 S/2020 S 41 S/2019 S 21 S/2004 S 52 S/2020 S 43 S/2019 S 43 S/2020 S 44
Phoebe subgroup (27)	Phoebe S/2006 S 20 S/2006 S 9 S/2007 S 2 S/2019 S 2 Greip Suttungr S/2004 S 60 S/2007 S 3 S/2006 S 11 S/2019 S 7 S/2019 S 8 Thrymr S/2004 S 46 Angrboda Gerd S/2019 S 13 Skrymir S/2006 S 28 Alvaldi Ymir S/2020 S 35 S/2020 S 37 S/2019 S 39 S/2006 S 19 Saturn LVIII S/2019 S 44

Tethys

Geology

Chasmata	Ithaca Chasma Ogygia Chasma
Montes	Scheria Montes
Craters	Melanthius Naubolos Odysseus Penelope
Lists	Features Quadrangles

Astronomy

Discovery	Giovanni Domenico Cassini Sidera Lodoicea
Trojans	Telesto(leading) Calypso(trailing)

Exploration

Past	Pioneer 11 Voyager 1 Voyager 2 Cassini–Huygens
Proposed	Titan Saturn System Mission (TSSM)

v t e Saturn
Outline
Geography	Dragon Storm Great White Spot Saturn Electrostatic Discharges Hexagon Magnetosphere Rings
Moons	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus Pandora Epimetheus Janus Aegaeon Mimas Methone Anthe Pallene Enceladus Tethys Telesto Calypso Dione Helene Polydeuces Rhea Titan Hyperion Iapetus Inuit group Kiviuq Paaliaq Siarnaq Gallic group Albiorix Norse group Phoebe
Astronomy	Delta Octantis Saturn-crossing minor planets Solar eclipses on Saturn
Exploration	Cassini–Huygens (Huygens) timeline retirement Pioneer 11 Voyager program Voyager 1 Voyager 2
Related	Fiction The Day the Earth Smiled In Saturn's Rings (2018 documentary)
Category

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