Ymir (moon)
From Wikipedia, the free encyclopedia
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Discovery[1]
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| Discovered by | Brett J. Gladman |
| Discovery site | Observatoire de la Cote d'Azur |
| Discovery date | 2000 |
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Designations
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| Alternate name(s) | S/2000 S1 |
| Adjective | Ymirian |
| Semi-major axis | 23,040,000 km |
| Eccentricity | 0.3349 |
| Orbital period | 3.6 yr (1315.14 d) |
| Mean anomaly | 244.521° |
| Inclination | 173.125° |
| Longitude of ascending node | 194.086° |
| Argument of perihelion | 22.668° |
| Satellite of | Saturn |
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Physical characteristics
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| Dimensions | 18 km[3] |
| Mass | 5.1×1015 kg[4] |
| Escape velocity | 8.7 m/s (31 km/h)[4] |
| Albedo | 0.06[5] |
| Apparent magnitude | 21.7[3] |
Ymir (
/ˈɪmɪər/ IM-eer), or Saturn XIX, is a retrograde irregular moon of Saturn. It was discovered by Brett J. Gladman, et al. in 2000, and given the temporary designation S/2000 S 1. It was named in August 2003, from Norse mythology, where Ymir is the ancestor of all the Jotuns or frost giants.[6]
Of the moons that take more than 3 Earth years to orbit Saturn, Ymir is the largest.[3] It is 18 kilometres (11 miles) in diameter and takes 3.6 Earth years to complete an orbit around Saturn.
[edit] References
- ^ Brian G. Marsden (2000-10-25). "IAUC 7512". IAU. http://www.cbat.eps.harvard.edu/iauc/07500/07512.html. Retrieved 2011-01-08.
- ^ Jacobson, R.A. (2007) SAT270, SAT271 (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. http://ssd.jpl.nasa.gov/?sat_elem#saturn. Retrieved 2008-02-14.
- ^ a b c Scott S. Sheppard. "Saturn's Known Satellites". Department of Terrestrial Magnetism. http://www.dtm.ciw.edu/users/sheppard/satellites/satsatdata.html. Retrieved 2008-02-14.
- ^ a b assume radius of 9 km; volume of a sphere * assume density of 1.7g/cm³ (though it could be a loose rubble pile) yields a mass of 5.1e15 kg and an escape velocity of 8.7 m/s (31 km/h)
- ^ Nicholson, P. D. 2001
- ^ Daniel W. E. Green (2003-08-08). "IAUC 8177: Sats OF (22); Sats OF JUPITER, SATURN, URANUS". IAU. http://www.cbat.eps.harvard.edu/iauc/08100/08177.html. Retrieved 2011-01-08.
[edit] External links
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Wikimedia Commons has media related to: Ymir (moon) |
- MPEC 2000-Y15: S/2000 S 1, S/2000 S 2, S/2000 S 7, S/2000 S 8, S/2000 S 9 (2000 Dec. 19 ephemeris)
- Ephemeris IAU-NSES
- Saturn's Known Satellites (by Scott S. Sheppard)
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