Telesto (moon)

Short description: Trojan moon of Saturn

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[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]: 2
Mean diameter| 24.6±0.6 km[2]: 2
Volume| 7795 km3[lower-alpha 1]
Mass| ≈ 4×1015 kg (assumed; unmeasured)[lower-alpha 2]
Mean density| ≈ 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 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

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

## References

### Citations

1. ↑ 1.0 1.1 1.2 "Planetary Satellite Mean Orbital Parameters". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sats/elem/sep.html.
2. ↑ 2.0 2.1 2.2 2.3 2.4 Thomas & Helfenstein 2020.
3. ↑ Hamilton.
4. ↑ IAUC 3466.
5. ↑ IAUC 3484.
6. ↑ IAUC 3605.
7. ↑ IAUC 3593.
8. ↑ Seidelmann Harrington et al. 1981.

### 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

* NASA - Telesto Profile
* NASA's Solar System Exploration
* The Planetary Society: Telesto

* 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
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* Voyager 1
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Related|

* Fiction
* Moons
* The Day the Earth Smiled
* In Saturn's Rings (2018 documentary)

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