Tarvos (moon)

Moon of Saturn

Tarvos

Animation of discovery images taken by the CFHT in September 2000

Discovery[1]
Discovered by| B. J. Gladman et al.[2]
Discovery date| September 23, 2000
Designations

Designation

| Saturn XXI
Pronunciation| /ˈtɑːrvɒs/

Named after

| Tarvos Trigaranus

Alternative names

| S/2000 S 4
Adjectives| Tarvian[3]
Orbital characteristics[4]
Epoch 2000 January 1.5

Semi-major axis

| 18.215 Gm
Eccentricity| 0.528

Orbital period (sidereal)

| 926.4 d
(2.54 yr)
Inclination| 38.6°
Satellite of| Saturn
Group| Gallic group
Physical characteristics

Mean diameter

| 15+50%
−30% km[5]
Albedo| 0.06 assumed[5]

Spectral type

| light red
B−V=0.77, R−V=0.57[6]

Apparent magnitude

| 22.1[7]

Absolute magnitude (H)

| 12.9[7]

Tarvos /ˈtɑːrvɒs/, or Saturn XXI, is a prograde irregular satellite of Saturn. It was discovered by John J. Kavelaars et al. on September 23, 2000, and given the temporary designation S/2000 S 4. The name, given in August 2003, is after Tarvos, a deity depicted as a bull god carrying three cranes alongside its back from Gaulish mythology.[8]

## Orbit

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Discovery images of Tarvos (circled) taken by the CFHT

Tarvos orbits Saturn at an average distance of 18 million km in 926 days and is about 15 km in diameter (assuming an albedo of 0.06).[5] It has a high orbital eccentricity of 0.53.[4]

It is a member of the Gallic group of irregular satellites.

## Origin

[edit]

With a similar orbit and displaying a similar light-red colour to Albiorix, Tarvos is thought to have its origin in the break-up of a common progenitor[6][9] or to be a fragment of that body.[10]

## References

[edit]

1. ^ "Planetary Satellite Discovery Circumstances". ssd.jpl.nasa.gov.
2. ^ "MPEC 2000-Y14 : S/2000 S 3, S/2000 S 4, S/2000 S 5, S/2000 S 6, S/2000 S 10". minorplanetcenter.net. December 19, 2000.
3. ^ Per the diminutive Tarvillus in Davis, Daniel (2001). The Development of Celtic Linguistics, 1850-1900. p. 162.
4. ^ a b SAT452 from Jacobson, R. A. (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 2008-01-19.
5. ^ a b c Denk, T.; Mottola, S. (2019). Cassini Observations of Saturn's Irregular Moons (PDF). 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute.
6. ^ a b Grav, Tommy; Holman, Matthew J.; Gladman, Brett; Aksnes, Kaare (November 2003). "Photometric Survey of the Irregular Satellites". Icarus. 166 (1): 33–45\. arXiv:astro-ph/0301016. Bibcode:2003Icar..166...33G. doi:10.1016/j.icarus.2003.07.005.
7. ^ a b Denk, Tilmann; Mottola, Stefano; Tosi, Frederico; Bottke, William F.; Hamilton, Douglas P. (2018). "The Irregular Satellites of Saturn" (PDF). In Schenk, P.M.; Clark, R.N.; Howett, C.J.A.; Verbiscer, A.J.; Waite, J.H. (eds.). Enceladus and the Icy Moons of Saturn. Space Science Series. Vol. 322\. Tucson, AZ: The University of Arizona Press. pp. 409–434\. Bibcode:2018eims.book..409D. doi:10.2458/azu_uapress_9780816537075-ch020. ISBN 9780816537075.
8. ^ "IAUC 8177: Sats OF (22); Sats OF JUPITER, SATURN, URANUS". www.cbat.eps.harvard.edu. August 8, 2003.
9. ^ Gladman, Brett; Kavelaars, J. J.; Holman, Matthew; Nicholson, Philip D.; Burns, Joseph A.; Hergenrother, Carl W.; Petit, Jean-Marc; Marsden, Brian G.; Jacobson, Robert; Gray, William; Grav, Tommy (2001-07-12). "Discovery of 12 satellites of Saturn exhibiting orbital clustering". Nature. 412 (6843): 163–166\. doi:10.1038/35084032. ISSN 1476-4687. PMID 11449267.
10. ^ Grav, T.; Bauer, J. (2007-03-08) [2006-11-18]. "A deeper look at the colors of the Saturnian irregular satellites". Icarus. 191 (1): 267–285\. arXiv:astro-ph/0611590. Bibcode:2007Icar..191..267G. doi:10.1016/j.icarus.2007.04.020.

## External links

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* Ephemeris IAU-MPC NSES
* Saturn's Known Satellites (by Scott S. Sheppard)

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Moons of Saturn

Listed in approximate increasing distance from Saturn

Ring moonlets|

* S/2009 S 1
* Aegaeon
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* S/2004 S 3
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Ring shepherds|

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Alkyonides|

* Methone
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Large moons
(with trojans)|

* Mimas
* Enceladus
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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

* Rings of Saturn
* Cassini–Huygens
* Chiron
* Chrysalis
* Themis
* S/2004 S 3
* S/2004 S 4
* S/2004 S 6
* Peggy
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* Moonlet
* In fiction

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Saturn

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Moons|

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Astronomy|

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Exploration|

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Related|

* Fiction
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