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S/2004 S 3

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Unconfirmed object orbiting Saturn

S/2004 S 3
Discovery
Discovery image of S/2004 S 3
Discovered by	CICLOPS Team ^[1]
Discovery date	June 21, 2004
Orbital characteristics ^[2]^[3]^[4]
Semi-major axis	140,100–140,600 km
Eccentricity	< 0.002 ^[a]
Orbital period (sidereal)	0.62 d
Inclination	close to zero
Satellite of	Saturn
Group	F Ring
Physical characteristics
Mean radius	~2 km
Synodic rotation period	probably synchronous
Axial tilt	unknown
Albedo	unknown

S/2004 S 3 is an unconfirmedmoon of Saturn, seen orbiting just beyond the outer strand of theF ring on June 21, 2004. It was discovered by theCassini Imaging Science Team Archived 2011-05-20 at theWayback Machine in images taken by theCassini–Huygens probe on June 21, 2004^[4] and announced on September 9, 2004.^[5]

Animated sequence of S/2004 S 3 discovery images byCassini on June 21, 2004

Despite later attempts to recover it, it has not been reliably sighted since. Notably, an imaging sequence covering an entire orbital period at 4 km resolution taken on November 15, 2004 failed to recover the object. The sequence should have been easily capable of detecting a moon of similar size, suggesting it to simply be a transient clump. An approximate linkage could be made of S/2004 S 3 toS/2004 S 4, and matched to two other detected clumps on other dates, but considering its non-detection in November, their relation is probably coincidental.^[2]

Another object,S/2004 S 4, was sighted nearby 5 hours later, but this time justinside the F Ring. Because of the differing localisation the second object was given a fresh designation, although their interpretation as a single object on a F-ring crossing orbit is also possible.^[5] Such an object might also be orbiting at a slightly different inclination to the F ring, thereby not actually passing through the ring material despite being seen both radially inward and outward of it.

If a solid object after all,S/2004 S 3 would be 3–5 km in diameter based on brightness, and might be ashepherd satellite for the outer edge of Saturn's Fring.

References

[edit]

Explanatory

^Based on above semimajor axis range, andSpitale Jacobson et al. 2006

Citations

Sources

"Cassini Imaging Science Team". Cassini Imaging Central Laboratory for OPerationS. Archived fromthe original on 2011-05-20. Retrieved2012-01-01.
Green, Daniel W. E. (September 9, 2004)."S/2004 S 3, S/2004 S 4, and R/2004 S 1"(discovery).IAU Circular (8401): 1.Bibcode:2004IAUC.8401....1P. Retrieved2012-01-01.
Green, Daniel W. E. (November 8, 2004)."Satellites and Rings of Saturn".IAU Circular (8432). Retrieved2012-01-01. (claiming recovery ofS/2004 S 3 on October 17, 2004 in conflict with the laterSpitale Jacobson et al. 2006)
Martinez, Carolina; Ormrod, Gill; Finn, Heidi (September 9, 2004)."Cassini Discovers Ring and One, Possibly Two, Objects at Saturn".jpl.nasa.gov. NASA Jet Propulsion Laboratory. Archived fromthe original on 2006-10-21. Retrieved2012-01-01.
Spitale, J. N.; Jacobson, R. A.; Porco, C. C.; Owen, W. M. Jr. (2006)."The orbits of Saturn's small satellites derived from combined historic andCassini imaging observations".The Astronomical Journal.132 (2):692–710.Bibcode:2006AJ....132..692S.doi:10.1086/505206.S2CID 26603974.

External links

[edit]

Cassini–Huygens press release about discoveries around the F ring in 2004 at theWayback Machine (archived 2004-10-16)
Cassini–Huygens Multimedia:The Clump/Moon Mystery September 5, 2005 at theLibrary of Congress Web Archives (archived 2009-04-25) – images of the clumps and/or moons seen around the F ring by Cassini cameras

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

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