Ymir (moon)
Discovery[1] | |
---|---|
Discovered by | Brett J. Gladman |
Discovery site | Observatoire de la Cote d'Azur |
Discovery date | 2000 |
Designations | |
S/2000 S1, Saturn XIX | |
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] | |
11 h 55 m 20 s[5] | |
Albedo | 0.06[6] |
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.[7]
Of the moons that take more than 3 Earth years to orbit Saturn, Ymir is the largest, at about 18 kilometres (11 miles) in diameter.[3] It takes 3.6 Earth years to complete an orbit around Saturn. During this time, hypothetical Ymir visitors would experience ~2650 sunsets.
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.
- 1 2 3 Scott S. Sheppard. "Saturn's Known Satellites". Department of Terrestrial Magnetism. Retrieved 2008-02-14.
- 1 2 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)
- ↑ Denk, T., Mottola, S. (2013): Irregular Saturnian Moon Lightcurves from Cassini-ISS Observations: Update. Abstract 406.08, DPS conference 2013, Denver (Colorado)
- ↑ 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
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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