S/2003 J 2

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 2017, 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.
It seems to belong to a group all of its own, with semi-major axis ~30 gigametres (0.20 AU) and inclination ~160°.
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.
This moon has not been seen since its discovery in 2003 and is currently considered lost. Follow-up observations in 2018 are planned to secure its orbit.
== In the Timeline ==
=== Space Travel (1969) ===
In Space Travel a ship is tested by travelling to and landing on various planets and moons within the Solar System. Jupiter was one such planet used in the testing process so it is probable that some of its moons were used as well.
== Notes ==
* This page was originally taken from Wikipedia. Link: https://en.wikipedia.org/wiki/S/2003_J_2