Ymir (moon)

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, Saturn XIX
Adjectives	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.
1 2 3 Scott S. Sheppard. "Saturn's Known Satellites". Department of Terrestrial Magnetism. Retrieved 2008-02-14.
1 2 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)

Saturn (outline)
Geography	Dragon Storm Great White Spot Hexagon Magnetosphere Rings Diamonds
Moons	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus ?(S/2004 S 6 S/2004 S 4 S/2004 S 3) Pandora Epimetheus Janus Aegaeon Mimas Methone Anthe Pallene Enceladus Tethys Telesto Calypso Dione Helene Polydeuces Rhea Titan Hyperion Iapetus Kiviuq Ijiraq Phoebe Paaliaq Skathi Albiorix S/2007 S 2 Bebhionn Erriapus Skoll Siarnaq Tarqeq S/2004 S 13 Greip Hyrrokkin Jarnsaxa Tarvos Mundilfari S/2006 S 1 S/2004 S 17 Bergelmir Narvi Suttungr Hati S/2004 S 12 Farbauti Thrymr Aegir S/2007 S 3 Bestla S/2004 S 7 S/2006 S 3 Fenrir Surtur Kari Ymir Loge Fornjot
Astronomy	Delta Octantis Saturn-crossing minor planets
Exploration	Cassini–Huygens Enceladus Explorer Pioneer 11 Voyager program
Related	Fiction Saturn Moons

Natural satellites of the Solar System

Planetary
satellites

Other
satellites

Largest
satellites
(mean radius
≥ 100 km)

size	Ganymede largest / 2634 km / 0.413 Earths Titan Callisto Io Moon Europa Triton Titania Rhea Oberon Iapetus Charon Umbriel Ariel Dione Tethys [Dysnomia] Enceladus Miranda Proteus Mimas [Hi'iaka] Nereid Hyperion Phoebe smallest / 106 km / 0.017 Earths
abc's	Ariel Callisto Charon Dione [Dysnomia] Enceladus Europa Ganymede [Hi'iaka] Hyperion Iapetus Io Mimas Miranda Moon Nereid Oberon Phoebe Proteus Rhea Tethys Titan Titania Triton Umbriel

Discovery timeline
Inner moons
Irregular moons
List
Naming
Regular moons
Trojan moons
NOTE: Italicized moons are not close to being in hydrostatic equilibrium; [bracketed] moons may or may not be close to being in hydrostatic equilibrium.

Moons of Saturn
Listed in approximately increasing distance from Saturn. Temporary names in italics.
Ring shepherds	S/2009 S 1 Ring moonlets Pan Daphnis Atlas Prometheus Pandora
Co-orbitals	Epimetheus Janus
G Ring	Aegaeon
Mimas and Alkyonides	Mimas Methone Anthe Pallene
Inner large (with trojans)	Enceladus Tethys Telesto Calypso Dione Helene Polydeuces
Outer large	Rhea Titan Hyperion Iapetus
Inuit group	Kiviuq Ijiraq Paaliaq Siarnaq Tarqeq
Norse group	Phoebe Skathi S/2007 S 2(?) Skoll S/2004 S 13(?) Greip Hyrrokkin Jarnsaxa Mundilfari S/2006 S 1(?) S/2004 S 17(?) Bergelmir Narvi Suttungr Hati S/2004 S 12(?) Farbauti Thrymr Aegir S/2007 S 3(?) Bestla S/2004 S 7(?) S/2006 S 3 Fenrir Surtur Kari Ymir Loge Fornjot
Gallic group	Albiorix Bebhionn Erriapus Tarvos
Rings of Saturn Cassini–Huygens Themis Chiron S/2004 S 6 S/2004 S 4 S/2004 S 3 In fiction

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