Aegir (IPA: [aiɣɪr]), or 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. Not to be confused with the NATO phonetic alphabet, which has also informally been called the “International Phonetic Alphabetâ€. For information on how to read IPA transcriptions of English words, see IPA chart for English. ... A natural satellite is an object that orbits a planet or other body larger than itself and which is not man-made. ... Note: This article contains special characters. ... Scott S. Sheppard is an astronomer based at the Institute for Astronomy at the University of Hawaii. ... David C. Jewitt is a Professor of astronomy at the University of Hawaii Institute for Astronomy. ... Jan Kleyna is a postdoctoral astronomy researcher at the University of Hawaii Institute for Astronomy. ... Brian G. Marsden is an astronomer, the longtime director of the Minor Planet Center. ... May 4 is the 124th day of the year in the Gregorian calendar (125th in leap years). ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... December 12 is the 346th day (347th in leap years) of the year in the Gregorian calendar, with 19 days remaining. ... 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... March 11 is the 70th day of the year in the Gregorian calendar (71st in leap years). ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ...
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 (148° to Saturn's equator), in a retrograde direction and with an eccentricity of 0.237. Inclination in general is the angle between a reference plane and another plane or axis of direction. ... The plane of the ecliptic is well seen in this picture from the 1994 lunar prospecting Clementine spacecraft. ... This article is about retrograde motion. ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ...
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