Ymir (moon)

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Discovered byBrett J. Gladman
Discovery siteObservatoire de la Cote d'Azur
Discovery date2000
S/2000 S1, Saturn XIX
Orbital characteristics[2]
23,040,000 km
3.6 yr (1315.14 d)
Satellite ofSaturn
Physical characteristics
Dimensions18 km[3]
Mass5.1×1015 kg[4]
8.7 m/s (31 km/h)[4]
11 h 55 m 20 s[5]

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.


  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.CS1 maint: Multiple names: authors list (link)
  3. ^ a b c Scott S. Sheppard. "Saturn's Known Satellites". Department of Terrestrial Magnetism. Retrieved 2008-02-14.
  4. ^ 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)
  5. ^ T. Denk, S. Mottola, F. Tosi, W.F. Bottke, D.P. Hamilton (2018): The Irregular Satellites of Saturn. In: Enceladus and the Icy Moons of Saturn, Schenk, P.M., Clark, R.N., Howett, C.J.A., Verbiscer, A.J., Waite, J.H. (eds.), Space Science Series, The University of Arizona Press, Tucson, AZ. Chapter 20, p. 409-434. DOI:10.2458/azu_uapress_9780816537075-ch020.
  6. ^ Nicholson, P. D. 2001
  7. ^ Daniel W. E. Green (2003-08-08). "IAUC 8177: Sats OF (22); Sats OF JUPITER, SATURN, URANUS". IAU. Retrieved 2011-01-08.

External links[edit]