Ymir (moon)

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Ymir
Ymir-discovery-eso0036a (cropped).jpg
Discovery image of Ymir taken by the La Silla Observatory in August 2000
Discovery[1]
Discovered byBrett J. Gladman
Discovery siteObservatoire de la Cote d'Azur
Discovery date2000
Designations
Designation
Saturn XIX
Pronunciation/ˈmɪər/,[2] /ˈɪmɪər/[3]
Named after
Ymir
S/2000 S 1
AdjectivesYmirian /ɪˈmɪəriən/[4][5]
Orbital characteristics[6]
23,040,000 km
Eccentricity0.3349
3.6 yr (1315.14 d)
244.521°
Inclination173.125°
194.086°
22.668°
Satellite ofSaturn
GroupNorse group
Physical characteristics
Mean diameter
19+50%
−30%
 km
[7]
11.9222±0.00002 h[7]
11 h 55 m 20 s[8]
Albedo0.06[9]
21.7[10]

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]

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

Ymir imaged by the CFHT on 23 September 2000

References[edit]

  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". 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.
  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). Schenk, P.M.; Clark, R.N.; Howett, C.J.A.; Verbiscer, A.J.; Waite, J.H. (eds.). "The Irregular Satellites of Saturn" (PDF). Enceladus and the Icy Moons of Saturn. Space Science Series, The University of Arizona Press, Tucson, AZ. Chapter 20: 409–434. doi:10.2458/azu_uapress_9780816537075-ch020. ISBN 9780816537075.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  9. ^ Nicholson, P. D. 2001
  10. ^ a b Sheppard, Scott S. "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[edit]