Astronomy:Skoll (moon)

Skoll
	Image of Skoll taken by Cassini on February 23, 2016
Discovery
Discovered by	S. S. Sheppard; D. C. Jewitt; J. Kleyna
Discovery date	2006
Designations
Designation	Saturn XLVII
Pronunciation	English: /skɒl/; Old Norse: [skœlː] (approximately /skɜːrl/)
Named after	Sköll
Alternative names	S/2006 S 8
Orbital characteristics
Semi-major axis	17560000000 km
Eccentricity	0.418
Orbital period	869 days ; (2.38 yr)
Inclination	156°
Satellite of	Saturn
Group	Norse group
Physical characteristics
Mean diameter	5+50%; −30% km
Rotation period	7.26±0.09? h
Albedo	0.04 (assumed)

Short description: Moon of Saturn

Skoll or Saturn XLVII (provisional designation S/2006 S 8) is a retrograde irregular satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt and Jan Kleyna on 26 June 2006 from observations taken between 5 January and 30 April 2006.^[2]^[5]

Skoll is about 6 kilometres in diameter (assuming an albedo of 0.04) and orbits Saturn at an average distance of 17.6 Gm (million km) in 869 days, following a highly eccentric and moderately inclined orbit.^[4] A rotation period of 7.26±0.04 h was obtained by Cassini–Huygens in 2016, but this is in strong disagreement with 2013 data for unknown reasons; one possible explanation is variation in the rotation speed and axis due to Milankovitch wobble.^[6]

It was named in April 2007^[7] after Sköll, a giant wolf from Norse mythology, son of Fenrir and twin brother of Hati.

References

↑ Discovery Circumstances from JPL
↑ ^2.0 ^2.1 MPEC 2006-M45: Eight New Satellites of Saturn 26 June 2006 (discovery and ephemeris)
↑ ^3.0 ^3.1 Denk, T.; Mottola, S. (2019). "Cassini Observations of Saturn's Irregular Moons". 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute. https://www.hou.usra.edu/meetings/lpsc2019/pdf/2654.pdf.
↑ ^4.0 ^4.1 Scott Sheppard's pages
↑ IAUC 8727: Satellites of Saturn 30 June 2006 (discovery)
↑ Denk, T.; Mottola, S.; Bottke, W. F.; Hamilton, D. P. (2018). "The Irregular Satellites of Saturn". Enceladus and the Icy Moons of Saturn. 322. University of Arizona Press. pp. 409–434. doi:10.2458/azu_uapress_9780816537075-ch020. ISBN 9780816537488. Bibcode: 2018eims.book..409D. https://tilmanndenk.de/wp-content/uploads/DenkEtAl2018_IrregularMoons.pdf.
↑ "IAUC 8826: Sats OF JUPITER, SATURN; RING OF URANUS; 2006 VV_2". http://www.cbat.eps.harvard.edu/iauc/08800/08826.html.

MPC: Natural Satellites Ephemeris Service
Mean orbital parameters from NASA JPL

External links

David Jewitt's pages

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Original source: https://en.wikipedia.org/wiki/Skoll (moon). Read more

[Discoverers_JPL-1] Discovery Circumstances from JPL

[MPEC-2] 2.0 ^2.1 MPEC 2006-M45: Eight New Satellites of Saturn 26 June 2006 (discovery and ephemeris)

[LPSC2654-3] 3.0 ^3.1 Denk, T.; Mottola, S. (2019). "Cassini Observations of Saturn's Irregular Moons". 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute. https://www.hou.usra.edu/meetings/lpsc2019/pdf/2654.pdf.

[SheppardPage-4] 4.0 ^4.1 Scott Sheppard's pages

[5] IAUC 8727: Satellites of Saturn 30 June 2006 (discovery)

[Denk2018-6] Denk, T.; Mottola, S.; Bottke, W. F.; Hamilton, D. P. (2018). "The Irregular Satellites of Saturn". Enceladus and the Icy Moons of Saturn. 322. University of Arizona Press. pp. 409–434. doi:10.2458/azu_uapress_9780816537075-ch020. ISBN 9780816537488. Bibcode: 2018eims.book..409D. https://tilmanndenk.de/wp-content/uploads/DenkEtAl2018_IrregularMoons.pdf.

[7] "IAUC 8826: Sats OF JUPITER, SATURN; RING OF URANUS; 2006 VV_2". http://www.cbat.eps.harvard.edu/iauc/08800/08826.html.

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v t e 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)

v t e Natural satellites of the Solar System
Planetary satellites	Terrestrial Martian Jovian Saturnian Uranian Neptunian
Dwarf-planet satellites	Plutonian Haumean Makemakean Eridian OR₁₀ Quaoaran Orcean
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

v t e 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

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Discovery^[1]
Image of Skoll taken by Cassini on February 23, 2016
Discovered by	S. S. Sheppard D. C. Jewitt J. Kleyna
Discovery date	2006
Designations
Designation	Saturn XLVII
Pronunciation	English: /skɒl/ Old Norse: [skœlː] (approximately /skɜːrl/)
Named after	Sköll
Alternative names	S/2006 S 8
Orbital characteristics^[2]
Semi-major axis	17560000000 km
Eccentricity	0.418
Orbital period	869 days (2.38 yr)
Inclination	156°
Satellite of	Saturn
Group	Norse group
Physical characteristics
Mean diameter	5+50% −30% km^[3]
Rotation period	7.26±0.09? h^[3]
Albedo	0.04 (assumed)^[4]

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