The Juno spacecraft, which successfully entered the orbit of Jupiter on July 4, 2016, will for the first time peer below the dense cover of clouds to answer questions about the gas giant and the origins of our solar system.

Juno's primary goal is to reveal the story of Jupiter's formation and evolution. Using long-proven technologies on a spinning spacecraft placed in an elliptical polar orbit, Juno will observe Jupiter's gravity and magnetic fields, atmospheric dynamics and composition, and evolution.

Mission Events

Launch - August 5, 2011
Deep Space Maneuvers - August/September 2012
Earth flyby gravity assist - October 2013
Jupiter arrival and orbit insertion - July 4, 2016
End of mission (deorbit into Jupiter) - July 2021. NASA has approved an update to Juno's science operations until July 2021. This provides for an additional 41 months in orbit around Jupiter and will enable Juno to achieve its primary science objectives. Juno is in 53-day orbits rather than 14-day orbits as initially planned because of a concern about valves on the spacecraft's fuel system. This longer orbit means that it will take more time to collect the needed science data. For more information, go to:

Scientific Instruments

- Gravity Science
- Magnetometer (MAG)
- Microwave Radiometer (MWR)
- Jupiter Energetic Particle Detector Instrument (JEDI)
- Jovian Auroral Distributions Experiment (JADE)
- Waves
- Ultraviolet Imaging Spectrograph (UVS)
- Jovian Infrared Auroral Mapper (JIRAM)
- JunoCam