S/2003 J 12

Infobox Planet
name = S/2003 J 12
bgcolour = #ffc0c0
discovery = yes
discoverer = Scott S. Sheppard "et al."
discovered = 2003
mean_orbit_radius = 17.883 million km
period = 489.72 days
inclination = 143°
eccentricity = 0.4920
physical_characteristics = yes
mean_radius = ~0.5 km

nowrap|S/2003 J 12 is a natural satellite of Jupiter, and is the smallest known satellite in our solar system. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2003. [ [http://cfa-www.harvard.edu/iauc/08000/08089.html IAUC 8089: "Satellites of Jupiter"] 2003 March 7 (discovery)] [ [http://cfa-www.harvard.edu/mpec/K03/K03E29.html MPEC 2003-E29: "S/2003 J 9, 2003 J 10, 2003 J 11, 2003 J 12; S/2003 J 1, 2003 J 6"] 2003 April 3 (discovery and ephemeris)]

nowrap|S/2003 J 12 is about 1 kilometre 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.cite web
date=2007-Jun-28
title=Planetary Satellite Mean Orbital Parameters
publisher=JPL/NASA
author=Jacobson, R.A. (2006) JUP263
url=http://ssd.jpl.nasa.gov/?sat_elem#jupiter
accessdate=2008-01-21]

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

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