Ymir (moon)

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Ymir
Discovery[1]
Discovered by Brett J. Gladman
Discovery place Observatoire de la Cote d'Azur
Discovery time 2000
Names
Other names S/2000 S1
Adjective Ymirian
Orbit[2]
Longest distance from the center of its orbital path
("semi-major axis")
23,040,000 km
How egg-shaped its orbit is
("eccentricity")
0.3349
How long it takes to complete an orbit 3.6 yr (1315.14 d)
Mean anomaly 244.521°
Angle above the reference plane
("inclination")
173.125°
Longitude of where it comes up through the reference plane 194.086°
Angle between its shortest distance from what it orbits around and where it comes up through the reference plane
("argument of periapsis")
22.668°
What it orbits Saturn
Size and Other Qualities
Measures 18 km[3]
Mass 5.1×1015 kg[4]
Slowest speed able to escape into space
("escape velocity")
8.7 m/s (31 km/h)[4]
How much light it reflects 0.06[5]
Seeming brightness
("apparent magnitude")
21.7[3]

Ymir (/ˈɪmɪər/ IM-eer), or Saturn XIX is a moon of Saturn. It was found by Brett J. Gladman, et al. in 2000, and given the 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]

Ymir is about 16 kilometres in diameter, and orbits Saturn at an average distance of 23,175,000 km in 1317.137 days, at an inclination of 172° to the ecliptic (146° to Saturn's equator), with an eccentricity of 0.358.

References[change | edit source]

  1. Brian G. Marsden (2000-10-25). "IAUC 7512". IAU. http://www.cbat.eps.harvard.edu/iauc/07500/07512.html. Retrieved 2011-01-08.
  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. 3.0 3.1 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. 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)
  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://www.cbat.eps.harvard.edu/iauc/08100/08177.html. Retrieved 2011-01-08.

Other websites[change | edit source]