S/2003 J 12
|Discovered by||Scott S. Sheppard et al.|
|Mean orbit radius||17.883 million km|
|Orbital period||489.72 days|
|Mean radius||~0.5 km|
S/2003 J 12 is a natural satellite of Jupiter, and is the smallest known satellite in the Solar System. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2003.
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.
It is the innermost of the outer irregular retrograde satellites of Jupiter, and does not seem to belong to any group.
- Jacobson, R.A. (2006) JUP263 (2007-06-28). "Planetary Satellite Mean Orbital Parameters". JPL/NASA. Retrieved 2008-01-21.
- IAUC 8089: Satellites of Jupiter 2003 March 7 (discovery)
- 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)