Ymir (moon)

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Ymir
Discovery^[1]
Discovered by	Brett J. Gladman
Discovery site	Observatoire de la Cote d'Azur
Discovery date	2000
Designations
Alternative names	S/2000 S1
Adjective	Ymirian
Orbital characteristics^[2]
Semi-major axis	23,040,000 km
Eccentricity	0.3349
Orbital period	3.6 yr (1315.14 d)
Mean anomaly	244.521°
Inclination	173.125°
Longitude of ascending node	194.086°
Argument of perihelion	22.668°
Satellite of	Saturn
Physical characteristics
Dimensions	18 km^[3]
Mass	5.1×10¹⁵ kg^[4]
Escape velocity	8.7 m/s (31 km/h)^[4]
Rotation period	11 h 55 m 20 s^[5]
Albedo	0.06^[6]
Apparent magnitude	21.7^[3]

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.

References

↑ Brian G. Marsden (2000-10-25). "IAUC 7512". IAU. Retrieved 2011-01-08.
↑ Jacobson, R.A. (2007) SAT270, SAT271 (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 2008-02-14.
↑ 3.0 3.1 3.2 Scott S. Sheppard. "Saturn's Known Satellites". Department of Terrestrial Magnetism. Retrieved 2008-02-14.
↑ 4.0 4.1 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)
↑ Denk, T., Mottola, S. (2013): Irregular Saturnian Moon Lightcurves from Cassini-ISS Observations: Update. Abstract 406.08, DPS conference 2013, Denver (Colorado)
↑ Nicholson, P. D. 2001
↑ Daniel W. E. Green (2003-08-08). "IAUC 8177: Sats OF (22); Sats OF JUPITER, SATURN, URANUS". IAU. Retrieved 2011-01-08.

External links

Wikimedia Commons has media related to Ymir (moon).

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)

v t e Moons of Saturn

Generally listed in increasing distance from Saturn. Temporary names in italics.

Ring shepherds	S/2009 S 1 Propeller moonlets Pan Daphnis Atlas Prometheus ?(S/2004 S 6 S/2004 S 4 S/2004 S 3) Pandora

Co-orbitals	Epimetheus Janus

G Ring	Aegaeon

Inner large (with Trojans)	Mimas Enceladus Tethys Telesto Calypso Dione Helene Polydeuces

Alkyonides	Methone Anthe Pallene

Outer large	Rhea Titan Hyperion Iapetus

Inuit group	Kiviuq Ijiraq Paaliaq Siarnaq Tarqeq

Gallic group	Albiorix Bebhionn Erriapus Tarvos

Norse group	Phoebe Skathi S/2007 S 2 Skoll S/2004 S 13 Greip Hyrrokkin Mundilfari Jarnsaxa S/2006 S 1 S/2004 S 17 Narvi Bergelmir Aegir Suttungr S/2004 S 12 Bestla Farbauti Hati S/2004 S 7 Thrymr S/2007 S 3 S/2006 S 3 Surtur Kari Fenrir Ymir Loge Fornjot

Rings of Saturn Cassini–Huygens Themis Chiron In fiction

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