Skathi (moon)

Skathi
Discovery
Discovery date	2000
Designations
Designation	Saturn XXVII
Pronunciation	/ˈskɑːði/[1]
Alternative names	Skaði; S/2000 S8
Orbital characteristics [2]
Semi-major axis	15541000 km
Eccentricity	0.270
Orbital period	−728.2 days
Inclination	152.6°
Satellite of	Saturn
Group	Norse group
Physical characteristics
Mean diameter	8+50%; −30% km[3]
Rotation period	11.10±0.02 h[3]
Apparent magnitude	23.6

Skathi /ˈskɑːði/, or Saturn XXVII, is a natural satellite of Saturn. It was discovered by Brett Gladman, Kavelaars and colleagues in 2000, and given the temporary designation S/2000 S 8.[4][5] Skathi is about 8 kilometres in diameter and orbits Saturn at an average distance of 15.576 Gm in 725.784 days, at an inclination of 149° to the ecliptic (150° to Saturn's equator), in a retrograde direction and with an eccentricity of 0.246. Its rotation period is 11.1±0.02 hours.[3]

Skathi may have been formed from debris knocked off Phoebe by large impacts at some point in the Solar System's history.

Name

The name comes from Norse mythology, where Skaði is a giantess and the wife of the Vanir god Niord. The name of the moon was given as Skadi by early sources, with a ⟨d⟩ as a graphical approximation of the Icelandic letter ⟨ð⟩ eth. That was the spelling that had been announced in 2003;[6] however, the IAU Working Group on Planetary System Nomenclature (WGPSN) decided in early 2005 to instead use the transliteration ⟨th⟩.[7] The adjectival form "Skathian" is found in fiction.[8]

References

Merriam-Webster's Encyclopedia of Literature (1995).
The 'a' vowel is actually transcribed as [a], a non-English vowel between English /æ/ and /ɑː/. The latter is consistent with other Old Norse names in English such as Vanir ("Vanir". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)).
S.S. Sheppard (2019), Moons of Saturn, Carnegie Science, on line
Denk, T.; Mottola, S. (2019). Cassini Observations of Saturn's Irregular Moons (PDF). 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute.
IAUC 7538: S/2000 S 7, S/2000 S 8, S/2000 S 9 7 December 2000 (discovery) Archived April 28, 2006, at the Wayback Machine
MPEC 2000-Y15: S/2000 S 1, S/2000 S 2, S/2000 S 7, S/2000 S 8, S/2000 S 9 19 December 2000 (discovery and ephemeris)
IAUC 8177: Satellites of Jupiter, Saturn, Uranus 8 August 2003 (naming the moon) Archived July 9, 2008, at the Wayback Machine
IAUC 8471: Satellites of Saturn 21 January 2005 (naming the moon)
Cole (2010) Kresley Cole Immortals After Dark: The Clan MacRieve

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[1] Merriam-Webster's Encyclopedia of Literature (1995).
The 'a' vowel is actually transcribed as [a], a non-English vowel between English /æ/ and /ɑː/. The latter is consistent with other Old Norse names in English such as Vanir ("Vanir". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)).

[2] S.S. Sheppard (2019), Moons of Saturn, Carnegie Science, on line

[LPSC2654-3] Denk, T.; Mottola, S. (2019). Cassini Observations of Saturn's Irregular Moons (PDF). 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute.

[4] IAUC 7538: S/2000 S 7, S/2000 S 8, S/2000 S 9 7 December 2000 (discovery) Archived April 28, 2006, at the Wayback Machine

[5] MPEC 2000-Y15: S/2000 S 1, S/2000 S 2, S/2000 S 7, S/2000 S 8, S/2000 S 9 19 December 2000 (discovery and ephemeris)

[6] IAUC 8177: Satellites of Jupiter, Saturn, Uranus 8 August 2003 (naming the moon) Archived July 9, 2008, at the Wayback Machine

[7] IAUC 8471: Satellites of Saturn 21 January 2005 (naming the moon)

[8] Cole (2010) Kresley Cole Immortals After Dark: The Clan MacRieve

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 Kiviuq Ijiraq Phoebe Paaliaq Skathi S/2004 S 37 Albiorix S/2007 S 2 S/2004 S 29 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 S/2004 S 20 Suttungr Hati S/2004 S 12 S/2004 S 27 Farbauti Thrymr S/2004 S 30 Aegir S/2007 S 3 Bestla S/2004 S 7 S/2004 S 22 S/2004 S 23 S/2004 S 25 S/2004 S 32 S/2006 S 3 S/2004 S 38 Fenrir S/2004 S 28 Surtur Kari S/2004 S 35 Ymir S/2004 S 21 S/2004 S 24 Loge S/2004 S 36 S/2004 S 39 S/2004 S 33 S/2004 S 34 Fornjot S/2004 S 26
Astronomy	Delta Octantis Saturn-crossing minor planets
Exploration	Cassini–Huygens (Huygens) timeline retirement Pioneer 11 Voyager program Voyager 1 Voyager 2
Related	Fiction Moons The Day the Earth Smiled In Saturn's Rings (2018 documentary)

Natural satellites of the Solar System
Planetary satellites	Terrestrial Martian Jovian Saturnian Uranian Neptunian
Dwarf-planet satellites	Plutonian Haumean Makemakean Eridian Gonggong Quaoar Orcus
Minor-planet moons	Main belt binaries: Antiope Frostia Berna Tokai Ostro Balam Doppler Pauling Iwamoto Wolff Bettig Christophedumas Trojans: Patroclus–Menoetius Hektor–Skamandrios Iphthime Eurydamas TNOs: Huya Typhon–Echidna Lempo–Paha–Hiisi 2002 UX₂₅ Logos–Zoe Ceto–Phorcys Borasisi–Pabu Sila–Nunam Teharonhiawako–Sawiskera Salacia–Actaea 2002 WC₁₉ Altjira Varda–Ilmarë 2003 AZ₈₄ Gǃkúnǁʼhòmdímà–Gǃòʼé ǃHú Mors–Somnus Manwë–Thorondor ǂKá̦gára–ǃHãunu 2013 FY27
Ranked by size	Planetary-mass moon Ganymede largest: 5268 km / 0.413 Earths Titan Callisto Io Moon Europa Triton Titania Rhea Oberon Iapetus Charon Umbriel Ariel Dione Tethys Dysnomia Enceladus Miranda Vanth Proteus Mimas Ilmarë Nereid Hiʻiaka Actaea Hyperion ...
Discovery timeline Inner moons Irregular moons List Planetary-mass moons Naming Subsatellite Regular moons Trojan moons

Moons of Saturn
Listed in approximately increasing distance from Saturn.
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	Kiviuq Ijiraq Paaliaq S/2004 S 29 S/2004 S 31 Siarnaq Tarqeq
Norse group	Phoebe Skathi S/2004 S 37 S/2007 S 2 Skoll S/2004 S 13 (?) Greip Hyrrokkin Jarnsaxa Mundilfari S/2006 S 1 S/2004 S 17 (?) Bergelmir Narvi S/2004 S 20 Suttungr Hati S/2004 S 12 (?) S/2004 S 27 Farbauti Thrymr S/2004 S 30 Aegir S/2007 S 3 (?) Bestla S/2004 S 7 (?) S/2004 S 22 S/2004 S 23 S/2004 S 25 S/2004 S 32 S/2006 S 3 S/2004 S 38 Fenrir S/2004 S 28 Surtur Kari S/2004 S 35 Ymir S/2004 S 21 Loge S/2004 S 36 S/2004 S 39 S/2004 S 33 S/2004 S 34 Fornjot S/2004 S 26
Gallic group	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