Aegir (moon)

Aegir
Discovery
Discovered by	S. Sheppard, D. Jewitt, J. Kleyna, and B. Marsden
Discovery date	May 4, 2005
Designations
Designation	Saturn XXXVI
Pronunciation	/ˈaɪjɪər, ˈæɡɪər/ etc.
Named after	Ægir
Alternative names	S/2004 S 10
Adjectives
Orbital characteristics
Semi-major axis	20,735,000 km[1]
Eccentricity	0.252[1]
Orbital period	1,025.908 d
Inclination	166.7°[1]
Satellite of	Saturn
Group	Norse group
Physical characteristics
Mean diameter	6+50%; −30% km[1]

Aegir, also Saturn XXXVI (provisional designation S/2004 S 10), is a natural satellite of Saturn. Its discovery was announced by Scott S. Sheppard, David C. Jewitt, Jan Kleyna, and Brian G. Marsden on May 4, 2005, from observations taken between December 12, 2004, and March 11, 2005.

Aegir is about 6 kilometres in diameter, and orbits Saturn at an average distance of 19,618 Mm in 1025.908 days, at an inclination of 167° to the ecliptic (140° to Saturn's equator), in a retrograde direction and with an eccentricity of 0.237.

Name

The moon was named in April 2007 after Ægir, a giant from Norse mythology, the personification of tranquil seas, the one who soothes storms away. He is a son of Fornjót, and brother of Logi (fire, flame) and Kári (wind).

The name may be pronounced various ways. /ˈaɪjɪər/ (with the 'g' pronounced as a y-sound) approximates modern Norwegian and Icelandic. /ˈæɡɪər/ (with a hard 'g') approximates what the Old Norse may have sounded like, while the Latinized/spelling pronunciations /ˈiːdʒɪər/, /ˈɛdʒɪər/ and /ˈeɪdʒɪər/ are also found.[2][3][4]

References

Ma, Yuehua; et al. (2010), "On the Origin of Retrograde Orbit Satellites around Saturn and Jupiter", Icy Bodies of the Solar System, Proceedings of the International Astronomical Union, IAU Symposium, 263, pp. 157–160, Bibcode:2010IAUS..263..157M, doi:10.1017/S1743921310001687.
Merriam-Webster's Encyclopedia of Literature (1995)
"Aegir". Dictionary.com Unabridged. Random House.
Harold Stanford (1922) The Standard Reference Work: For the Home, School and Library

External links

T. Denk's Aegir website
Institute for Astronomy Saturn Satellite Data
D. Jewitt's New Satellites of Saturn page
IAUC 8523: New Satellites of Saturn May 4, 2005 (discovery)
MPEC 2005-J13: Twelve New Satellites of Saturn May 3, 2005 (discovery and ephemeris)
IAUC 8826: Satellites of Jupiter and Saturn April 5, 2007 (naming the moon)

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[Ma2010-1] Ma, Yuehua; et al. (2010), "On the Origin of Retrograde Orbit Satellites around Saturn and Jupiter", Icy Bodies of the Solar System, Proceedings of the International Astronomical Union, IAU Symposium, 263, pp. 157–160, Bibcode:2010IAUS..263..157M, doi:10.1017/S1743921310001687.

[2] Merriam-Webster's Encyclopedia of Literature (1995)

[3] "Aegir". Dictionary.com Unabridged. Random House.

[4] Harold Stanford (1922) The Standard Reference Work: For the Home, School and Library

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 (7)	Kiviuq Ijiraq Paaliaq S/2004 S 29 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 S/2004 S 20 Jarnsaxa Narvi Bergelmir Hati S/2004 S 17 (?) S/2004 S 12 (?) S/2004 S 27 Farbauti Thrymr Bestla S/2004 S 7 (?) Aegir S/2004 S 30 S/2004 S 22 S/2004 S 25 S/2004 S 32 S/2004 S 23 S/2006 S 3 S/2004 S 35 Kari S/2004 S 28 Loge S/2004 S 38 Fenrir Ymir Surtur S/2004 S 33 S/2004 S 21 S/2004 S 39 S/2004 S 36 Fornjot S/2004 S 34 S/2004 S 26
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

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)