Astronomy:Telesto (moon)

Telesto
	Telesto as seen by the Cassini probe on 11 October 2005
Discovery
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	Τελεστώ Telestō
Alternative names	Tethys B; S/1980 S 13
Adjectives	Telestoan /tɛləˈstoʊ.ən/ or Telestoian /tɛləˈstoʊ.iən/
Orbital characteristics
Semi-major axis	295000 km
Eccentricity	0.001
Orbital period	1.887802 d
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)
Mean diameter	24.6±0.6 km
Volume	7795 km3
Mass	≈ 4×1015 kg (assumed; unmeasured)
Mean density	≈ 0.5 g/cm3 (assumed; unmeasured)
surface gravity	≈ 0.0011–0.0014 m/s2
escape velocity	≈ 0.006 km/s at longest axis; to ≈ 0.007 km/s at poles
Axial tilt	zero
Apparent magnitude	18.7

Short description: Trojan moon of Saturn

Telesto /təˈlɛstoʊ/ is a moon of Saturn. It was discovered by Smith, Reitsema, Larson and Fountain in 1980 from ground-based observations, and was provisionally designated S/1980 S 13.^[4] In the following months, several other apparitions were observed: S/1980 S 24,^[5] S/1980 S 33,^[6] and S/1981 S 1.^[7]

In 1983 it was officially named after Telesto of Greek mythology.^{[lower-alpha 3]} It is also designated as Saturn XIII or Tethys B.

Telesto is co-orbital with Tethys, residing in Tethys' leading Lagrangian point (L₄). This relationship was first identified by Seidelmann Harrington et al. 1981}}|Seidelmann et 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 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.

Notes

↑ Calculated from Telesto's volume-equivalent sphere radius of 12.3±0.3 km given by Thomas et al. (2020)^[2]^(p2)
↑ Calculated by multiplying Telesto's volume with its assumed density of 500 kg/m³.
↑ Transactions of the International Astronomical Union, Vol. XVIIIA, 1982 (confirms Janus, names Epimetheus, Telesto, Calypso) (mentioned in IAUC 3872)

References

Citations

Sources

Hamilton, Calvin J.. "Saturn's Trojan Moon Telesto". SolarViews.com. SolarViews. http://www.solarviews.com/eng/telesto.htm.
Marsden, Brian G. (April 10, 1980). "Satellites of Saturn" (discovery). IAU Circular 3466. http://www.cbat.eps.harvard.edu/iauc/03400/03466.html. Retrieved 2011-12-23.
Marsden, Brian G. (June 6, 1980). "Satellites of Saturn". IAU Circular 3484. http://www.cbat.eps.harvard.edu/iauc/03400/03484.html. Retrieved 2011-12-23.
Marsden, Brian G. (April 16, 1981). "Satellites of Saturn". IAU Circular 3593. http://www.cbat.eps.harvard.edu/iauc/03500/03593.html. Retrieved 2011-12-23.
Marsden, Brian G. (May 18, 1981). "Satellites of Saturn". IAU Circular 3605. http://www.cbat.eps.harvard.edu/iauc/03600/03605.html. Retrieved 2011-12-23.
Marsden, Brian G. (September 30, 1983). "Satellites of Jupiter and Saturn". IAU Circular 3872. http://www.cbat.eps.harvard.edu/iauc/03800/03872.html. Retrieved 2011-12-23.
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. doi:10.1016/0019-1035(81)90172-X. Bibcode: 1981Icar...47..282S.
Thomas, P. C. (July 2010). "Sizes, shapes, and derived properties of the saturnian satellites after the Cassini nominal mission". Icarus 208 (1): 395–401. doi:10.1016/j.icarus.2010.01.025. Bibcode: 2010Icar..208..395T. http://www.ciclops.org/media/sp/2011/6794_16344_0.pdf. Retrieved 2015-09-04.
Thomas, P. C.; Helfenstein, P. (July 2020). "The small inner satellites of Saturn: Shapes, structures and some implications". Icarus 344: 20. doi:10.1016/j.icarus.2019.06.016. 113355. Bibcode: 2020Icar..34413355T.

External links

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Original source: https://en.wikipedia.org/wiki/Telesto (moon). Read more

[3] Calculated from Telesto's volume-equivalent sphere radius of 12.3±0.3 km given by Thomas et al. (2020)^[2]^(p2)

[4] Calculated by multiplying Telesto's volume with its assumed density of 500 kg/m³.

[mythology-10] Transactions of the International Astronomical Union, Vol. XVIIIA, 1982 (confirms Janus, names Epimetheus, Telesto, Calypso) (mentioned in IAUC 3872)

[jpl-satelem-1] 1.0 ^1.1 ^1.2 "Planetary Satellite Mean Orbital Parameters". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sats/elem/sep.html.

[FOOTNOTEThomas_&_Helfenstein2020-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 Thomas & Helfenstein 2020.

[FOOTNOTEHamilton-5] Hamilton.

[FOOTNOTEIAUC_3466-6] IAUC 3466.

[FOOTNOTEIAUC_3484-7] IAUC 3484.

[FOOTNOTEIAUC_3605-8] IAUC 3605.

[FOOTNOTEIAUC_3593-9] IAUC 3593.

[FOOTNOTESeidelmann_Harrington_et_al._1981-11] Seidelmann Harrington et al. 1981.

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v t e Moons of Saturn
Listed in approximately increasing distance from Saturn.
Ring shepherds	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus Pandora
Co-orbitals	Epimetheus Janus
G Ring	Aegaeon
Alkyonides	Methone Anthe Pallene
Inner large (with trojans)	Mimas Enceladus Tethys Telesto Calypso Dione Helene Polydeuces
Outer large	Rhea Titan Hyperion Iapetus
Inuit group	Kiviuq Ijiraq Paaliaq S/2004 S 29 S/2004 S 31 Siarnaq Tarqeq
Norse group	Phoebe Skathi S/2004 S 37 S/2007 S 2 Skoll S/2004 S 13(?) Greip Hyrrokkin Jarnsaxa Mundilfari S/2006 S 1 S/2004 S 17(?) Bergelmir Narvi S/2004 S 20 Suttungr Hati S/2004 S 12(?) S/2004 S 27 Farbauti Thrymr S/2004 S 30 Aegir S/2007 S 3(?) Bestla S/2004 S 7(?) S/2004 S 22(?) S/2004 S 23(?) S/2004 S 25(?) S/2004 S 32(?) S/2006 S 3 S/2004 S 38(?) Fenrir S/2004 S 28(?) Surtur Kari S/2004 S 35(?) Ymir S/2004 S 21(?) Loge S/2004 S 36(?) S/2004 S 39(?) S/2004 S 33(?) S/2004 S 34(?) Fornjot S/2004 S 26(?)
Gallic group	Albiorix Bebhionn Erriapus Tarvos
Prograde outer satellites	S/2004 S 24
Rings of Saturn Cassini–Huygens Themis Chiron S/2004 S 6 S/2004 S 4 S/2004 S 3 In fiction

v t e Saturn
Outline of Saturn
Geography	Dragon Storm Great White Spot Hexagon Magnetosphere Rings
Moons	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus S/2004 S 6 S/2004 S 4 S/2004 S 3 Pandora Epimetheus Janus Aegaeon Mimas Methone Anthe Pallene Enceladus Tethys Telesto Calypso Dione Helene Polydeuces Rhea Titan Hyperion Iapetus Kiviuq Ijiraq Phoebe Paaliaq Skathi S/2004 S 37 Albiorix S/2007 S 2 S/2004 S 29 Bebhionn Erriapus Skoll S/2004 S 31 Siarnaq Tarqeq S/2004 S 13 Greip Hyrrokkin Jarnsaxa Tarvos Mundilfari S/2006 S 1 S/2004 S 17 Bergelmir Narvi S/2004 S 20 Suttungr Hati S/2004 S 12 S/2004 S 27 Farbauti Thrymr S/2004 S 30 Aegir S/2007 S 3 Bestla S/2004 S 7 S/2004 S 22 S/2004 S 23 S/2004 S 25 S/2004 S 32 S/2006 S 3 S/2004 S 38 Fenrir S/2004 S 28 Surtur Kari S/2004 S 35 Ymir S/2004 S 21 S/2004 S 24 Loge S/2004 S 36 S/2004 S 39 S/2004 S 33 S/2004 S 34 Fornjot S/2004 S 26
Astronomy	Delta Octantis Saturn-crossing minor planets
Exploration	Cassini–Huygens (Huygens) timeline retirement Pioneer 11 Voyager program Voyager 1 Voyager 2
Related	Fiction Moons The Day the Earth Smiled In Saturn's Rings (2018 documentary)

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Discovery
Telesto as seen by the Cassini 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	Τελεστώ Telestō
Alternative names	Tethys B S/1980 S 13
Adjectives	Telestoan /tɛləˈstoʊ.ən/ or Telestoian /tɛləˈstoʊ.iən/
Orbital characteristics
Semi-major axis	295000 km^[1]
Eccentricity	0.001^[1]
Orbital period	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]^(p2)
Mean diameter	24.6±0.6 km^[2]^(p2)
Volume	7795 km³^{[lower-alpha 1]}
Mass	≈ 4×10¹⁵ kg (assumed; unmeasured)^{[lower-alpha 2]}
Mean density	≈ 0.5 g/cm³ (assumed; unmeasured)^[2]^(p3)
surface gravity	≈ 0.0011–0.0014 m/s²^[2]^(p3)
escape velocity	≈ 0.006 km/s at longest axis to ≈ 0.007 km/s at poles
Axial tilt	zero
Apparent magnitude	18.7 ^[3]

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