Ymir (moon)

Infobox Planet
bgcolour = #ffa812
name = Ymir
discovery = yes
discovery_ref = cite web
date=2000 October 25
title=IAUC 7512
publisher=IAU
author=Brian G. Marsden
url=http://cfa-www.harvard.edu/iauc/07500/07512.html
accessdate=2008-02-14]
discoverer = Brett J. Gladman
discovery_site = Observatoire de la Cote d'Azur
discovered = 2000
alt_names = S/2000 S1
orbit_ref = cite web
date=2007-Jun-28
title=Planetary Satellite Mean Orbital Parameters
publisher=JPL/NASA
author=Jacobson, R.A. (2007) SAT270, SAT271
url=http://ssd.jpl.nasa.gov/?sat_elem#saturn
accessdate=2008-02-14]
semimajor = 23,040,000 km
eccentricity = 0.3349
period = 1315.14 d (3.6 yr)
inclination = 173.125°
mean_anomaly = 244.521°
arg_peri = 22.668°
asc_node = 194.086°
satellite_of = Saturn
physical_characteristics = yes
dimensions = 18 kmcite web
title=Saturn's Known Satellites
publisher= Department of Terrestrial Magnetism
author=Scott S. Sheppard
url=http://www.dtm.ciw.edu/sheppard/satellites/satsatdata.html
accessdate=2008-02-14]
mass = 5.1e|15 kgassume 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)]
escape_velocity = 8.7 m/s (31 km/h)
albedo = 0.06 [Nicholson, P. D. 2001]
magnitude = 21.7

Ymir (pronEng|ˈɪmɪr "IM-irr)" 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.cite web
date=2003 August 8
title=IAUC 8177: Sats OF (22); Sats OF JUPITER, SATURN, URANUS
publisher=IAU
author=Daniel W. E. Green
url=http://cfa-www.harvard.edu/iauc/08100/08177.html
accessdate=2008-02-14]

Of the moons that take more than 3 Earth years to orbit Saturn, Ymir is the largest. It is 18 km in diameter and takes 3.6 Earth years to complete an orbit around Saturn.

References

External links

* [http://cfa-www.harvard.edu/mpec/K00/K00Y15.html 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)
* [http://cfa-www.harvard.edu/iau/NatSats/NaturalSatellites.html Ephemeris IAU-NSES]
* [http://www.dtm.ciw.edu/sheppard/satellites/satsatdata.html Saturn's Known Satellites] (by Scott S. Sheppard)