Ymir (moon)
| Discovery[1] | |
|---|---|
| Discovered by | Brett J. Gladman |
| Discovery site | Observatoire de la Cote d'Azur |
| Discovery date | 2000 |
| Designations | |
| S/2000 S1 | |
| Adjectives | Ymirian |
| Orbital characteristics[2] | |
| 23,040,000 km | |
| Eccentricity | 0.3349 |
| 3.6 yr (1315.14 d) | |
| 244.521° | |
| Inclination | 173.125° |
| 194.086° | |
| 22.668° | |
| Satellite of | Saturn |
| Physical characteristics | |
| Dimensions | 18 km[3] |
| Mass | 5.1×1015 kg[4] |
| 8.7 m/s (31 km/h)[4] | |
| Albedo | 0.06[5] |
| 21.7[3] | |
Ymir (/[invalid input: 'icon']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.
References
- ^ Brian G. Marsden (2000-10-25). "IAUC 7512". IAU. Retrieved 2011-01-08.
- ^ Jacobson, R.A. (2007) SAT270, SAT271 (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 2008-02-14.
{{cite web}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link) - ^ a b c Scott S. Sheppard. "Saturn's Known Satellites". Department of Terrestrial Magnetism. 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. Retrieved 2011-01-08.
External links
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