We won’t see much data coming back from Juno until the last few days of August or into September.
That’s because right now, Juno is actually pretty far away from Jupiter. The mission was designed to give the probe two 53-day-long orbits that swing close to Jupiter on one side but very far away on the other.
That lets Juno get settled in while protecting it from the worst of Jupiter’s huge and very damaging radiation field, which circles the planet like a doughnut.
NASA can use this time to make last tweaks to Juno’s orbital path and test the instruments on board. Then, when Juno flies close over Jupiter again on August 27, it will be ready to look at Jupiter in more detail than we’ve ever seen before. After a second 53-day orbit, Juno will settle into a closer orbit that only takes 14 days per trip — those are when the bulk of the science will be done.
Juno’s instruments were all powered down on June 29 in preparation for the tricky orbital insertion manoeuvre on Monday night. That’s because they could have been damaged by Jupiter’s huge radiation field.
Five of those instruments are now turned on and ready to go, with the rest to come in the next couple of weeks. Juno’s gear is tailored to map the magnetic and gravitational fields of Jupiter, measure the amount of water in its atmosphere, and understand what causes the huge auroras that decorate the planet’s poles. And, of course, there’s a camera on board, nicknamed JunoCam, ready to snap beautiful portraits of our largest neighbour.
“We had to turn all our beautiful instruments off to help ensure a successful Jupiter orbit insertion on July 4,” said Scott Bolton, Juno principal investigator from the Southwest Research Institute in San Antonio in a press release from NASA. “But next time around we will have our eyes and ears open. You can expect us to release some information about our findings around September 1.”