PROFILPELAJAR.COM

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
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
Mean diameter	4 km
Albedo	0.06 (assumed)
Spectral type	B–R = 1.30 ± 0.06
Apparent magnitude	24.4
Absolute magnitude (H)	15.5

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 4 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 exoplanet Epsilon Eridani b (AEgir) was also named after this figure in 2015.^[4]

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.^[5]^[6]^[7]

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, 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. Retrieved 2017-09-25.
^ 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