Ymir (moon)


Ymir-discovery-eso0036a (cropped).jpg
Discovery image of Ymir taken by the La Silla Observatory in August 2000
Discovered byBrett J. Gladman
Discovery siteObservatoire de la Cote d'Azur
Discovery date2000
Saturn XIX
Pronunciation/ˈmɪər/,[2] /ˈɪmɪər/[3]
Named after
S/2000 S 1
AdjectivesYmirian /ɪˈmɪəriən/[4][5]
Orbital characteristics[6]
23,040,000 km
3.6 yr (1315.14 d)
Satellite ofSaturn
GroupNorse group
Physical characteristics
Mean diameter
11.9222±0.00002 h[7]
11 h 55 m 20 s[8]

Ymir /ˈmɪər/, 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.[11]

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.[10] It takes 3.6 Earth years to complete an orbit around Saturn.

Ymir imaged by the CFHT on 23 September 2000


  1. ^ Brian G. Marsden (2000-10-25). "IAUC 7512". IAU. Retrieved 2011-01-08.
  2. ^ "Ymir". Merriam-Webster Dictionary.
  3. ^ Merriam-Webster's Encyclopedia of Literature (1995)
  4. ^ Budd (1898) "Norse Mythology", in St. Mary's Hall lectures: and other papers, p. 84. Because the -r is an inflectional ending, and the oblique stem is Ymi (as in Modern Norse Yme), one might expect the English adjective to be ?Ymian, but that is perhaps too short a word to be easily intelligible.
  5. ^ James Hall III (2015) Moons of the Solar System, p. 107
  6. ^ 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)
  7. ^ a b Denk, T.; Mottola, S. (2019). Cassini Observations of Saturn's Irregular Moons (PDF). 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute.
  8. ^ 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.
  9. ^ Nicholson, P. D. 2001
  10. ^ a b Scott S. Sheppard. "Saturn's Known Satellites". Department of Terrestrial Magnetism. Retrieved 2008-02-14.
  11. ^ Daniel W. E. Green (2003-08-08). "IAUC 8177: Sats OF (22); Sats OF JUPITER, SATURN, URANUS". IAU. Retrieved 2011-01-08.

External links

  • 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)
  • Ymir website (by Tilmann Denk)