S/2019 S 1

S/2019 S 1
Discovery
Discovered by	Ashton et al.
Discovery date	2019 (announced 2021)
Orbital characteristics
Semi-major axis	11221100 km
Eccentricity	0.623
Orbital period (sidereal)	443.78 days
Inclination	44.4°
Satellite of	Saturn
Group	Inuit group
Physical characteristics
Mean diameter	5+2.5; −1.5 km
Apparent magnitude	25.1

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.^[2] It might be a collisional fragment of Kiviuq and Ijiraq, which share very similar orbital elements.^[3]

This moon's eccentric orbit takes it closer than 1.5 million km (0.93 million mi) to Iapetus several times per millennium.^[3]

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 (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 S/2019 S 1: Tilmann Denk

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[announcement-1] "MPEC 2021-W14 : S/2019 S 1". minorplanetcenter.net. Retrieved 16 November 2021.

[DP53-2] 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.

[Denk-3] S/2019 S 1: Tilmann Denk

[1]

[2]

[3]

v t Moons of Saturn
Listed in approximately increasing distance from Saturn as of epoch JD 2459200.5.
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 (8)	S/2019 S 1 Kiviuq Ijiraq Paaliaq Saturn LX S/2004 S 31 Tarqeq Siarnaq
Norse group (46)	Phoebe Skathi S/2004 S 37 S/2007 S 2 Skoll Hyrrokkin Greip Mundilfari S/2004 S 13 (?) S/2006 S 1 S/2007 S 3 (?) Suttungr Saturn LIV Jarnsaxa Narvi Bergelmir Hati S/2004 S 17 (?) S/2004 S 12 (?) Saturn LIX Farbauti Thrymr Bestla S/2004 S 7 (?) Aegir Saturn LXI Saturn LV Saturn LVII Saturn LXII Saturn LVI S/2006 S 3 Saturn LXV Kari S/2004 S 28 Loge Saturn LXVI Fenrir Ymir Surtur Saturn LXIII S/2004 S 21 S/2004 S 39 S/2004 S 36 Fornjot Saturn LXIV Saturn LVIII
Gallic group (4)	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 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 S/2019 S 1 Kiviuq Ijiraq Phoebe Paaliaq Skathi S/2004 S 37 Albiorix S/2007 S 2 Saturn LX 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 Saturn LIV Suttungr Hati S/2004 S 12 Saturn LIX Farbauti Thrymr Saturn LXI Aegir S/2007 S 3 Bestla S/2004 S 7 Saturn LV Saturn LVI Saturn LVII Saturn LXII S/2006 S 3 Saturn LXVI Fenrir S/2004 S 28 Surtur Kari Saturn LXV Ymir S/2004 S 21 S/2004 S 24 Loge S/2004 S 36 S/2004 S 39 Saturn LXIII Saturn LXIV Fornjot Saturn LVIII
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)

Discovery^[1]
Discovered by	Ashton et al.
Discovery date	2019 (announced 2021)
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^[2]
Physical characteristics
Mean diameter	5+2.5 −1.5 km
Apparent magnitude	25.1