S/2003 J 18

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S/2003 J 18 is a natural satellite of Jupiter. It was discovered by a team of astronomers led by Brett J. Gladman in 2003.[1][2]

S/2003 J 18 is about 2 kilometres in diameter, and orbits Jupiter at an average distance of 19,813 Mm in 569.728 days, at an inclination of 147° to the ecliptic (149° to Jupiter's equator), in a retrograde direction and with an eccentricity of 0.1570.

It belongs to the Ananke group, retrograde irregular moons that orbit Jupiter between 19.3 and 22.7 Gm, at inclinations of roughly 150°.


  1. ^ Daniel W. E. Green (April 11, 2003). "IAUC 8116: Satellites of Jupiter and Saturn". International Astronomical Union. 
  2. ^ MPEC 2003-G20: S/2003 J 18 April 4, 2003 (discovery and ephemeris)