S/2004 S 31

S/2004 S 31
Discovery^[1]
Discovered by	Sheppard et al.
Discovery date	2019
Designations
Alternative names	T522499^[2]
Orbital characteristics^[2]
Semi-major axis	17402800 km
Eccentricity	0.242
Orbital period (sidereal)	853.80 days
Inclination	48.11°
Satellite of	Saturn
Group	Inuit group (Siarnaq)
Physical characteristics^[2]
Mean diameter	4 km
Apparent magnitude	24.9
Absolute magnitude (H)	15.6^[3]

S/2004 S 31 is a natural satellite of Saturn and a member of the Inuit group. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, and Jan Kleyna on October 8, 2019 from observations taken between December 12, 2004 and March 22, 2007.^[3]

S/2004 S 31 is about 4 kilometres in diameter, and orbits Saturn at an average distance of 17.568 Gm in 869.65 days, at an inclination of 48.8° to the ecliptic, with an eccentricity of 0.240.^[3] The satellite is affected by the Kozai mechanism, and is noted to be the first known moon whose argument of periapsis oscillates around 270°.^[4]

References

^ Discovery Circumstances from JPL
^ ^a ^b ^c S.S. Sheppard (2019), Moons of Saturn, Carnegie Science, on line
^ ^a ^b ^c "MPEC 2019-T153 : S/2004 S 31". minorplanetcenter.net. Retrieved 8 October 2019.
^ Jacobson, Robert A.; Brozović, Marina; Mastrodemos, Nickolaos; Riedel, Joseph E.; Sheppard, Scott S. (2022-11-07). "Ephemerides of the Irregular Saturnian Satellites from Earth-based Astrometry and Cassini Imaging*". The Astronomical Journal. IOP Publishing. 164 (6): 7. Bibcode:2022AJ....164..240J. doi:10.3847/1538-3881/ac98c7. ISSN 0004-6256.

Moons of Saturn

Listed in approximately increasing distance from Saturn

Ring moonlets

Ring shepherds

Other inner moons

Alkyonides

Inner large
(with trojans)

Outer large

Rhea
Titan
Hyperion
Iapetus

Inuit group (12)

Kiviuq group (5)	S/2019 S 1 Kiviuq S/2005 S 4 S/2020 S 1 Ijiraq
Paaliaq group (1)	Paaliaq
Siarnaq group (6)	S/2004 S 31 Tarqeq Siarnaq S/2019 S 14 S/2020 S 3 S/2020 S 5

Gallic group (7)

Albiorix
Bebhionn
S/2007 S 8
Saturn LX
Erriapus
Tarvos
S/2020 S 4

Norse group (100)

Phoebe group (3)	Phoebe S/2006 S 20 S/2006 S 9

Skathi
S/2007 S 5
S/2007 S 7
S/2007 S 2
S/2004 S 37
S/2004 S 47
S/2004 S 40
S/2019 S 2
S/2019 S 3
S/2020 S 7
Skoll
S/2020 S 2
S/2019 S 4
S/2004 S 41
S/2004 S 42
Hyrrokkin
Greip
S/2004 S 13
S/2007 S 6
Mundilfari
S/2006 S 1
S/2004 S 43
S/2006 S 10
S/2019 S 5
Gridr
Bergelmir
Jarnsaxa
Narvi
Suttungr
S/2007 S 3
S/2004 S 44
S/2004 S 45
Hati
S/2004 S 17
S/2006 S 11
S/2004 S 12
Eggther
S/2006 S 13
S/2007 S 9
S/2019 S 7
S/2019 S 8
Farbauti
Thrymr
Bestla
S/2019 S 9
S/2004 S 46
Angrboda
S/2019 S 11
Aegir
Beli
S/2019 S 10
S/2019 S 12
Gerd
S/2019 S 13
S/2006 S 14
Gunnlod
S/2019 S 15
S/2020 S 6
S/2004 S 7
S/2006 S 3
S/2005 S 5
Skrymir
S/2006 S 16
S/2006 S 15
S/2004 S 28
S/2020 S 8
Alvaldi
Kari
S/2004 S 48
Geirrod
Fenrir
S/2004 S 50
S/2006 S 17
S/2004 S 49
S/2019 S 17
Surtur
S/2006 S 18
Loge
Ymir
S/2019 S 19
S/2004 S 21
S/2019 S 18
S/2004 S 39
S/2019 S 16
S/2004 S 53
S/2004 S 36
Thiazzi
S/2019 S 20
S/2006 S 19
Saturn LXIV
Fornjot
S/2004 S 51
S/2020 S 10
S/2020 S 9
Saturn LVIII
S/2019 S 21
S/2004 S 52

Outlier prograde moons

S/2006 S 12

S/2019 S 6

S/2004 S 24

v t e Saturn
Outline
Geography	Dragon Storm Great White Spot 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
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

This page was last edited on 21 February 2024, at 02:08

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References