S/2019 S 1

S/2019 S 1
Discovery^[1]
S/2019 S 1 on the day of its discovery, revealed by stacking multiple images to its motion
Discovered by	E. Ashton et al.
Discovery date	2019 (announced 2021)
Designations
Alternative names	e26r58a12^[2]
Orbital characteristics^[1]
Semi-major axis	11221100 km
Eccentricity	0.623
Orbital period (sidereal)	443.78 days
Inclination	44.4°
Satellite of	Saturn
Group	Inuit group (Kiviuq)^[3]^[2]
Physical characteristics^[4]
Mean diameter	5+30% −15% km
Albedo	0.06 (assumed)
Apparent magnitude	25.3
Absolute magnitude (H)	15.3

S/2019 S 1 is a natural satellite of Saturn. Its discovery was announced by Edward Ashton, Brett J. Gladman, Jean-Marc Petit, and Mike Alexandersen on 16 November 2021 from Canada–France–Hawaii Telescope observations taken between 1 July 2019 and 14 June 2021.^[1]

S/2019 S 1 is about 5 kilometres in diameter, and orbits Saturn at an average distance of 11.2 million km (7.0 million mi) in 443.78 days, at an inclination of 44° to the ecliptic, in a prograde direction and with an eccentricity of 0.623.^[1] It belongs to the Inuit group of prograde irregular satellites, and is among the innermost irregular satellites of Saturn.^[3] It might be a collisional fragment of Kiviuq and Ijiraq, which share very similar orbital elements.^[4]

This moon's eccentric orbit takes it closer than 1.5 million km (0.93 million mi) to Iapetus several times per millennium.^[4]

References

^ ^a ^b ^c ^d "MPEC 2021-W14 : S/2019 S 1". minorplanetcenter.net. Retrieved 16 November 2021.
^ ^a ^b Ashton, Edward; Gladman, Brett; Beaudoin, Matthew; Alexandersen, Mike; Petit, Jean-Marc (May 2022). "Discovery of the Closest Saturnian Irregular Moon, S/2019 S 1, and Implications for the Direct/Retrograde Satellite Ratio". The Astronomical Journal. 3 (5): 5. Bibcode:2022PSJ.....3..107A. doi:10.3847/PSJ/ac64a2. S2CID 248771843. 107.
^ ^a ^b Ashton, Edward; Gladman, Brett; Beaudoin, Matthew; Alexandersen, Mike; Petit, Jean-Marc (October 2021). Detection biases favour retrograde over direct irregular moons. 53rd Annual DPS Meeting. American Astronomical Society. 308.09. Retrieved 17 November 2021.
^ ^a ^b ^c "S/2019 S 1 – Tilmann Denk".

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)
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