Jupiter was the fifth and largest planet in the Solar System. There were several terraformed colonies on its moons Ganymede, Io and Callisto. 
Due to the presence of several colonies, there were several Astral Gates in orbit. 
Faye Valentine fled from the Bebop after her encounter with Gordon, however, she ran out of fuel near Jupiter. 
Pao Pu-Zi escaped the Blue Snake crime syndicate in a ship towards Jupiter and was on his way when he disappeared.