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Ymir (moon)

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Discovered byBrett J. Gladman
Discovery placeObservatoire de la Cote d'Azur
Discovery time2000
Other namesS/2000 S1
Longest distance from the center of its orbital path
("semi-major axis")
23,040,000 km
How egg-shaped its orbit is
How long it takes to complete an orbit3.6 yr (1315.14 d)
Mean anomaly244.521°
Angle above the reference plane
Longitude of where it comes up through the reference plane194.086°
Angle between its shortest distance from what it orbits around and where it comes up through the reference plane
("argument of periapsis")
What it orbitsSaturn
Size and Other Qualities
Measures18 km[3]
Mass5.1×1015 kg[4]
Slowest speed able to escape into space
("escape velocity")
8.7 m/s (31 km/h)[4]
How much light it reflects0.06[5]
Seeming brightness
("apparent magnitude")

Ymir (/ˈɪmɪər/ IM-eer), or Saturn XIX is a moon of Saturn. It was found by Brett J. Gladman, et al. in 2000, and given the 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]

Ymir is about 16 kilometres in diameter, and orbits Saturn at an average distance of 23,175,000 km in 1317.137 days, at an inclination of 172° to the ecliptic (146° to Saturn's equator), with an eccentricity of 0.358.


  1. Brian G. Marsden (2000-10-25). "IAUC 7512". IAU. Retrieved 2011-01-08.
  2. Jacobson, R.A. (2007) SAT270, SAT271 (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 2008-02-14.
  3. 3.0 3.1 Scott S. Sheppard. "Saturn's Known Satellites". Department of Terrestrial Magnetism. Retrieved 2008-02-14.
  4. 4.0 4.1 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)
  5. Nicholson, P. D. 2001
  6. Daniel W. E. Green (2003-08-08). "IAUC 8177: Sats OF (22); Sats OF JUPITER, SATURN, URANUS". IAU. Retrieved 2011-01-08.

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