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S/2003 J 12 is a moon of Jupiter, and is the smallest known. It was found by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2003.[1][2]

S/2003 J 12
Discovery
Discovered byScott S. Sheppard et al.
Discovery date2003
Orbital characteristics
Mean orbit radius
17.740 million km
Eccentricity0.4449
482.691 days
Inclination143°
Physical characteristics
Mean radius
~0.5 km

S/2003 J 12 is about 1 kilometre in diameter, and orbits Jupiter at an average distance of 17,740,000 km in 482.691 days, at an inclination of 143° to the ecliptic (143° to Jupiter's equator), with an orbital eccentricity of 0.4449.

It is the closest of the farther non-spherical retrograde moons of Jupiter, and does not seem to belong to any group.

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