After the Atlas V rocket launches Juno into space, it will place the spacecraft in a parking orbit, in which it coasts around earth. At a particular point in this orbit, the rocket will fire again to put Juno on course toward Jupiter. Before separating from Juno, a set of thrusters will fire to give the space-craft some spin. Once Juno is deployed from the rocket, its solar arrays unfurl to begin charging its batteries.
While on its way to orbit, Juno communicates with ground controllers using the antennas on the Atlas rocket. But once the spacecraft detaches from the last rocket stage, it will communicate with Earth directly. NASA’s Deep Space Network, which has giant antennas in California, Spain and Australia, will lock onto its signal.
Juno will spend two years cruising the inner solar system before its trajectory takes it to Jupiter.
Extensive testing is done to ensure Juno makes it to Jupiter
Juno’s trajectory takes it on a five-year voyage, circling the inner solar system before arriving at Jupiter.
Since there are no filling stations in space, Juno has to carry enough fuel for its entire trip.