Ymir

Ymir (pronounced /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.[6]

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

References

1. ^ Brian G. Marsden (2000-10-25). "IAUC 7512". IAU. http://cfa-www.harvard.edu/iauc/07500/07512.html. Retrieved 2008-02-14.
2. ^ Jacobson, R.A. (2007) SAT270, SAT271 (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. http://ssd.jpl.nasa.gov/?sat_elem#saturn. Retrieved 2008-02-14.
3. ^ a b c Scott S. Sheppard. "Saturn's Known Satellites". Department of Terrestrial Magnetism. http://www.dtm.ciw.edu/users/sheppard/satellites/satsatdata.html. 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. ^ Nicholson, P. D. 2001
6. ^ Daniel W. E. Green (2003-08-08). "IAUC 8177: Sats OF (22); Sats OF JUPITER, SATURN, URANUS". IAU. http://cfa-www.harvard.edu/iauc/08100/08177.html. Retrieved 2008-02-14.

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)