S/2003 J 12

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S/2003 J 12
Discovered by Scott S. Sheppard et al.
Discovery date 2003
Orbital characteristics
Mean orbit radius
17.883 million km[1]
Eccentricity 0.4920
489.72 days
Inclination 143°
Physical characteristics
Mean radius
~0.5 km
Mass 1.50×1012 kg

S/2003 J 12 is a natural satellite of Jupiter, and is the third-smallest known satellite in the Solar System, after Aegaeon and S/2009 S 1. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2003.[2][3]

S/2003 J 12 is about 1 kilometre (0.6 miles) in diameter, and orbits Jupiter at an average distance of 17,883 Mm in 489.72 days, at an inclination of 143° to the ecliptic (143° to Jupiter's equator), in a retrograde direction and with an eccentricity of 0.4920.[1]

It is the innermost of the outer irregular retrograde satellites of Jupiter, and does not seem to belong to any group.


  1. ^ a b Jacobson, R. A. (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 2008-01-21. 
  2. ^ Daniel W. E. Green (March 7, 2003). "IAUC 8089: Satellites of Jupiter". International Astronomical Union. 
  3. ^ MPEC 2003-E29: S/2003 J 9, 2003 J 10, 2003 J 11, 2003 J 12; S/2003 J 1, 2003 J 6 April 3, 2003 (discovery and ephemeris)