Juno suffered two setbacks in October. First, a problem with check valves in the main thruster system prevented a planned rocket burn during its October 19 close pass by Jupiter. The science team raced to use the burnless perijove pass to do some science, but then the spacecraft went into safe mode on October 19, before perijove, and before the science sequences could kick in. Juno exited safe mode on October 24 and performed a half-hour burn with its maneuvering thrusters -- not its main thrusters, which were still not being used, pending the outcome of the investigation into the check valve problem. An article at Spaceflight Now goes into much more detail about the investigation into both engine problem and safing event.

At the DPS/EPSC meeting last week, principal investigator Scott Bolton spoke about keeping Juno in its long, 53.5-day orbit for a long time, not ruling out the possibility of performing the entire mission in such an orbit. Juno only gets exposed to dangerous radiation when very close to Jupiter, so the spacecraft wouldn't be exposed to any additional radiation by doing this, though it would seriously prolong the mission. If the mission has not ended by September 2019, Jupiter will have traveled far enough around the Sun that Juno will pass into Jupiter's shadow for several hours on every orbit, a condition that it was not designed for and which could harm its power system; the mission would need to develop a solution to that problem.

At present, the future orbital path of Juno is still uncertain. For the time being, it will stay in its 53.5-day orbit. According to JunoCam team member Glenn Orton, the next planned perijoves in that orbit would be: