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Aegir (moon)

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From Wikipedia, the free encyclopedia

Moon of Saturn

For other uses, seeAegir (disambiguation).

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
Orbital characteristics^[1]
Semi-major axis	20735000 km
Eccentricity	0.252
Orbital period (sidereal)	1025.908 d
Inclination	166.7°
Satellite of	Saturn
Group	Norse group
Physical characteristics^[2]
Mean diameter	4 km
Albedo	0.06 (assumed)
Spectral type	B–R = 1.30 ± 0.06^[3]
Apparent magnitude	24.4
Absolute magnitude (H)	15.5

Aegir, alsoSaturn XXXVI (provisional designationS/2004 S 10), is anatural satellite ofSaturn. Its discovery was announced byScott S. Sheppard,David C. Jewitt,Jan Kleyna, andBrian G. Marsden on May 4, 2005, from observations taken between December 12, 2004, and March 11, 2005.

Aegir is about 4 kilometres in diameter, and orbits Saturn at an average distance of 19,618 Mm in 1025.908 days, at aninclination of 167° to theecliptic (140° to Saturn's equator), in aretrograde direction and with aneccentricity of 0.237.

Name

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The moon was named in April 2007 afterÆgir, a giant fromNorse mythology, the personification of tranquil seas, the one who soothes storms away. He is a son ofFornjót, and brother ofLogi (fire, flame) andKári (wind). The exoplanetEpsilon Eridani b (Ægir) was also named after this figure in 2015.^[4]

The name may be pronounced various ways./ˈaɪjɪər/ (with the 'g' pronounced as ay-sound) approximates modern Norwegian and Icelandic./ˈæɡɪər/ (with a hard 'g') approximates what theOld Norse may have sounded like, while the Latinized/spelling pronunciations/ˈiːdʒɪər/,/ˈɛdʒɪər/ and/ˈeɪdʒɪər/ are also found.^[5]^[6]^[7]

References

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^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, vol. 263, pp. 157–160,Bibcode:2010IAUS..263..157M,doi:10.1017/S1743921310001687.
^Denk, Tilmann; Mottola, Stefano; Tosi, Frederico; Bottke, William F.; Hamilton, Douglas P. (2018)."The Irregular Satellites of Saturn"(PDF). In Schenk, P.M.; Clark, R.N.; Howett, C.J.A.; Verbiscer, A.J.; Waite, J.H. (eds.).Enceladus and the Icy Moons of Saturn. Space Science Series. Vol. 322. Tucson, AZ:The University of Arizona Press. pp. 409–434.Bibcode:2018eims.book..409D.doi:10.2458/azu_uapress_9780816537075-ch020.ISBN 9780816537075.
^Graykowski, Ariel; Jewitt, David (2018-04-05)."Colors and Shapes of the Irregular Planetary Satellites".The Astronomical Journal.155 (4): 184.arXiv:1803.01907.doi:10.3847/1538-3881/aab49b.ISSN 1538-3881.
^"Final Results of NameExoWorlds Public Vote Released".International Astronomical Union. 15 December 2015. Archived fromthe original on 2017-12-02. Retrieved2017-09-25.
^Merriam-Webster's Encyclopedia of Literature (1995)
^"Aegir".Dictionary.com Unabridged (Online). n.d.
^Harold Stanford (1922),The Standard Reference Work: For the Home, School and Library

External links

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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)

Moons of Saturn

Listed in approximate increasing distance from Saturn

Ring moonlets

Ring shepherds

Alkyonides

Large moons
(withtrojans)

Inuit group (36)

Kiviuq subgroup (20)	S/2023 S 1 S/2019 S 1 S/2004 S 54 S/2004 S 55 S/2020 S 11 S/2019 S 22 Kiviuq S/2023 S 2 S/2019 S 23 S/2020 S 12 S/2005 S 4 S/2019 S 25 S/2020 S 1 Ijiraq S/2019 S 24 S/2007 S 10 S/2019 S 26 S/2020 S 13 S/2023 S 6 S/2023 S 7
Paaliaq	Paaliaq
Siarnaq subgroup (15)	S/2004 S 31 S/2023 S 19 S/2023 S 3 S/2020 S 19 Tarqeq S/2019 S 14 Siarnaq S/2019 S 32 S/2020 S 3 S/2005 S 6 S/2019 S 6 S/2004 S 58 S/2006 S 23 S/2020 S 5 S/2023 S 22

Gallic group (17)

Albiorix
S/2020 S 15
Bebhionn
S/2007 S 8
Saturn LX
S/2019 S 29
S/2023 S 18
S/2023 S 17
S/2007 S 11
Erriapus
S/2019 S 31
Tarvos
S/2020 S 4
S/2019 S 34
S/2005 S 7
S/2006 S 12
S/2004 S 24

Norse group (197)

Low-inclination (12)	S/2023 S 38 Skathi S/2020 S 17 S/2023 S 20 S/2023 S 30 Hyrrokkin Narvi S/2019 S 37 Bestla S/2019 S 11 S/2020 S 27 S/2023 S 46
Kari subgroup (15)	S/2006 S 1 S/2004 S 45 S/2023 S 27 S/2006 S 3 S/2023 S 33 S/2020 S 30 Kari Geirrod S/2019 S 17 S/2019 S 19 S/2019 S 18 S/2004 S 21 S/2004 S 36 S/2019 S 20 S/2006 S 29
Mundilfari subgroup (143)	S/2023 S 50 S/2023 S 9 S/2004 S 56 S/2023 S 8 S/2023 S 11 S/2006 S 21 S/2006 S 22 S/2023 S 13 S/2023 S 10 S/2023 S 12 S/2007 S 5 S/2007 S 7 S/2004 S 37 S/2004 S 47 S/2004 S 40 S/2020 S 14 S/2019 S 27 S/2023 S 14 S/2020 S 16 S/2023 S 16 S/2019 S 3 S/2020 S 7 S/2019 S 28 Skoll S/2019 S 30 S/2023 S 21 S/2023 S 4 S/2020 S 18 S/2020 S 2 S/2019 S 4 S/2020 S 20 S/2004 S 41 S/2004 S 57 S/2006 S 24 S/2004 S 42 S/2023 S 15 S/2023 S 24 S/2004 S 13 S/2007 S 6 S/2019 S 35 S/2006 S 25 Mundilfari S/2006 S 26 S/2019 S 33 S/2023 S 23 S/2020 S 21 S/2004 S 43 S/2006 S 10 S/2019 S 5 S/2023 S 25 S/2004 S 59 S/2006 S 27 Gridr Bergelmir Jarnsaxa S/2023 S 44 S/2020 S 22 S/2004 S 44 Hati S/2004 S 17 S/2004 S 12 S/2020 S 23 Eggther S/2023 S 28 S/2023 S 37 S/2023 S 26 S/2019 S 36 S/2006 S 13 S/2023 S 48 S/2023 S 29 S/2007 S 9 Farbauti S/2019 S 9 S/2023 S 32 S/2020 S 24 Aegir S/2019 S 10 Beli S/2023 S 31 S/2020 S 25 S/2023 S 34 S/2023 S 39 S/2019 S 12 S/2004 S 61 S/2006 S 14 S/2023 S 40 Gunnlod S/2019 S 15 S/2020 S 6 S/2020 S 26 S/2023 S 41 S/2004 S 7 S/2005 S 5 S/2006 S 16 S/2023 S 49 S/2006 S 15 S/2023 S 42 S/2004 S 28 S/2020 S 32 S/2020 S 8 S/2020 S 28 S/2019 S 38 S/2004 S 48 S/2023 S 36 S/2023 S 35 S/2020 S 29 Fenrir S/2004 S 50 S/2006 S 17 S/2004 S 49 S/2020 S 34 S/2020 S 31 S/2023 S 43 Surtur S/2006 S 18 S/2020 S 36 Loge S/2020 S 33 S/2004 S 39 S/2019 S 16 S/2004 S 53 S/2023 S 45 Thiazzi S/2020 S 38 S/2020 S 40 S/2019 S 40 S/2019 S 42 Saturn LXIV S/2020 S 39 S/2019 S 41 Fornjot S/2023 S 47 S/2004 S 51 S/2020 S 10 S/2020 S 42 S/2020 S 9 S/2023 S 5 S/2020 S 41 S/2019 S 21 S/2004 S 52 S/2020 S 43 S/2019 S 43 S/2020 S 44
Phoebe subgroup (27)	Phoebe S/2006 S 20 S/2006 S 9 S/2007 S 2 S/2019 S 2 Greip Suttungr S/2004 S 60 S/2007 S 3 S/2006 S 11 S/2019 S 7 S/2019 S 8 Thrymr S/2004 S 46 Angrboda Gerd S/2019 S 13 Skrymir S/2006 S 28 Alvaldi Ymir S/2020 S 35 S/2020 S 37 S/2019 S 39 S/2006 S 19 Saturn LVIII S/2019 S 44

v t e Saturn
Outline
Geography	Dragon Storm Great White Spot Saturn Electrostatic Discharges 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 Solar eclipses on Saturn
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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