S/2003 J 2
|Discovered by||University of Hawaiʻi team led by Scott S. Sheppard and David C. Jewitt|
|Discovery date||March 4, 2003|
|981.55 d (2.687 Earth years)|
Average orbital speed
|2.19 km/s (calculated)|
|Inclination||154° (to the ecliptic)
152° (to Jupiter's equator)
S/2003 J 2 is a retrograde irregular satellite of Jupiter. The discovery, by a team of astronomers from the University of Hawaii led by Scott S. Sheppard and David C. Jewitt, was announced on March 4, 2003. As of 2015[update], it is Jupiter's outermost known moon.
S/2003 J 2 is about 2 km (1.2 mi) in diameter, and orbits Jupiter at an average distance of 29.54 gigametres (0.1975 AU) in 981.55 days, at an inclination of 154° to the ecliptic (152° to Jupiter's equator) and with an eccentricity of 0.4100.
The limits of Jupiter's gravitational influence are defined by its Hill sphere, whose radius is 52 gigametres (0.35 AU). Retrograde moons with axes up to 67% of the Hill radius are believed to be stable. Consequently, it is possible that even more distant moons of Jupiter may be discovered.
- IAUC 8087: Satellites of Jupiter 2003 March 4 (discovery)
- Sheppard, Scott S.; Jewitt, David C. (2003). "An abundant population of small irregular satellites around Jupiter" (PDF). Nature 423 (6937): 261–263. doi:10.1038/nature01584. PMID 12748634.[dead link]
- MPEC 2003-E11: S/2003 J 1, 2003 J 2, 2003 J 3, 2003 J 4, 2003 J 5, 2003 J 6, 2003 J 7 2003 March 4 (discovery and ephemeris)
- Mean orbital elements from NASA JPL (August 2006)
- Current (2004 July 14, JD= 2453200.5) orbital elements as reported by IAU-MPC NSES are a= 0.2024818 AU, e=0.1882469 i=153.52114