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NASA\u2019s Juno Back to Normal Operations After Entering Safe Mode<\/h1>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n![\"This](\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/03\/pia21770large.jpg?w=1920\")
<\/a><\/figure>\nNASA\u2019s Juno flies above Jupiter\u2019s Great Red Spot in this artist\u2019s concept.<\/div>\nNASA\/JPL-Caltech<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\nThe spacecraft was making its 71st close approach to Jupiter when it unexpectedly entered into a precautionary status.<\/em><\/p>\nData received from NASA\u2019s Juno mission indicates the solar-powered spacecraft went into safe mode twice on April 4 while the spacecraft was flying by Jupiter. Safe mode is a precautionary status that a spacecraft enters when it detects an anomaly. Nonessential functions are suspended, and the spacecraft focuses on essential tasks like communication and power management. Upon entering safe mode, Juno\u2019s science instruments were powered down, as designed, for the remainder of the flyby.<\/p>\n
The mission operations team has reestablished high-rate data transmission with Juno, and the spacecraft is currently conducting flight software diagnostics.The team will work in the ensuing days to transmit the engineering and science data collected before and after the safe-mode events to Earth.<\/p>\n
Juno first entered safe mode at 5:17 a.m. EDT, about an hour before its 71st close passage of Jupiter \u2014 called perijove. It went into safe mode again 45 minutes after perijove. During both safe-mode events, the spacecraft performed exactly as designed, rebooting its computer, turning off nonessential functions, and pointing its antenna toward Earth for communication.<\/p>\n
Of all the planets in our solar system, Jupiter is home to the most hostile environment, with the radiation belts closest to the planet being the most intense. Early indications suggest the two Perijove 71 safe-mode events occurred as the spacecraft flew through these belts. To block high-energy particles from impacting sensitive electronics and mitigate the harmful effects of the radiation, Juno features a titanium radiation vault<\/a>.<\/p>\nIncluding the Perijove 71 events, Juno has unexpectedly entered spacecraft-induced safe mode four times since arriving<\/a> at Jupiter in July 2016: first, in 2016 during its second orbit<\/a>, then in 2022 during its 39th orbit<\/a>. In all four cases, the spacecraft performed as expected and recovered full capability.<\/p>\nJuno\u2019s next perijove will occur on May 7 and include a flyby of the Jovian moon Io at a distance of about 55,300 miles (89,000 kilometers).<\/em><\/p>\nMore About Juno<\/h3>\n
NASA\u2019s Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Juno mission for the principal investigator, Scott Bolton, of the Southwest Research Institute in San Antonio. Juno is part of NASA\u2019s New Frontiers Program, which is managed at NASA\u2019s Marshall Space Flight Center in Huntsville, Alabama, for the agency\u2019s Science Mission Directorate in Washington. The Italian Space Agency (ASI) funded the Jovian InfraRed Auroral Mapper. Lockheed Martin Space in Denver built and operates the spacecraft. Various other institutions around the U.S. provided several of the other scientific instruments on Juno.<\/p>\n
More information about Juno is available at:<\/p>\n
https:\/\/www.nasa.gov\/juno<\/a><\/p>\nNews Media Contacts<\/h3>\n
DC Agle
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-9011
agle@jpl.nasa.gov<\/a><\/p>\nKaren Fox \/ Molly Wasser
NASA Headquarters, Washington
202-358-1600
karen.c.fox@nasa.gov<\/a> \/ molly.l.wasser@nasa.gov<\/a><\/p>\nDeb Schmid
Southwest Research Institute, San Antonio
210-522-2254
dschmid@swri.org<\/a><\/p>\n2025-049<\/p>\n
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![\"This](\"https:\/\/science.nasa.gov\/wp-content\/uploads\/2024\/03\/pia21770large.jpg\")
<\/a><\/figure>The spacecraft was making its 71st close approach to Jupiter when it unexpectedly entered into a precautionary status.<\/em><\/p>\n Data received from NASA\u2019s Juno mission indicates the solar-powered spacecraft went into safe mode twice on April 4 while the spacecraft was flying by Jupiter. Safe mode is a precautionary status that a spacecraft enters when it detects an anomaly. Nonessential functions are suspended, and the spacecraft focuses on essential tasks like communication and power management. Upon entering safe mode, Juno\u2019s science instruments were powered down, as designed, for the remainder of the flyby.<\/p>\n The mission operations team has reestablished high-rate data transmission with Juno, and the spacecraft is currently conducting flight software diagnostics.The team will work in the ensuing days to transmit the engineering and science data collected before and after the safe-mode events to Earth.<\/p>\n Juno first entered safe mode at 5:17 a.m. EDT, about an hour before its 71st close passage of Jupiter \u2014 called perijove. It went into safe mode again 45 minutes after perijove. During both safe-mode events, the spacecraft performed exactly as designed, rebooting its computer, turning off nonessential functions, and pointing its antenna toward Earth for communication.<\/p>\n Of all the planets in our solar system, Jupiter is home to the most hostile environment, with the radiation belts closest to the planet being the most intense. Early indications suggest the two Perijove 71 safe-mode events occurred as the spacecraft flew through these belts. To block high-energy particles from impacting sensitive electronics and mitigate the harmful effects of the radiation, Juno features a titanium radiation vault<\/a>.<\/p>\n Including the Perijove 71 events, Juno has unexpectedly entered spacecraft-induced safe mode four times since arriving<\/a> at Jupiter in July 2016: first, in 2016 during its second orbit<\/a>, then in 2022 during its 39th orbit<\/a>. In all four cases, the spacecraft performed as expected and recovered full capability.<\/p>\n Juno\u2019s next perijove will occur on May 7 and include a flyby of the Jovian moon Io at a distance of about 55,300 miles (89,000 kilometers).<\/em><\/p>\n NASA\u2019s Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Juno mission for the principal investigator, Scott Bolton, of the Southwest Research Institute in San Antonio. Juno is part of NASA\u2019s New Frontiers Program, which is managed at NASA\u2019s Marshall Space Flight Center in Huntsville, Alabama, for the agency\u2019s Science Mission Directorate in Washington. The Italian Space Agency (ASI) funded the Jovian InfraRed Auroral Mapper. Lockheed Martin Space in Denver built and operates the spacecraft. Various other institutions around the U.S. provided several of the other scientific instruments on Juno.<\/p>\n More information about Juno is available at:<\/p>\n https:\/\/www.nasa.gov\/juno<\/a><\/p>\n DC Agle Karen Fox \/ Molly Wasser Deb Schmid 2025-049<\/p>\nMore About Juno<\/h3>\n
News Media Contacts<\/h3>\n
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-9011
agle@jpl.nasa.gov<\/a><\/p>\n
NASA Headquarters, Washington
202-358-1600
karen.c.fox@nasa.gov<\/a> \/ molly.l.wasser@nasa.gov<\/a><\/p>\n
Southwest Research Institute, San Antonio
210-522-2254
dschmid@swri.org<\/a><\/p>\nShare<\/h2>\n<\/div>\n