{"signature":{"source":"NASA/JPL Horizons API","version":"1.2"},"result":"*******************************************************************************\n Revised: Sep 30, 2026          Juno Spacecraft  / (Sun, Jupiter)           -61 \n                     http://www.nasa.gov/mission_pages/juno/main/index.html\n                             http://missionjuno.swri.edu/#/mission\n \n NOTE: Post-launch trajectory begins at Centaur separation.\n\n 2016-Oct-24: A slow-responding helium check-valve issue is being analyzed, \n  resulting in delay of the main-engine burn to reduce orbit period from 53.4 \n  to 14 days. The next opportunity for the burn is December 11, 2016.\n\n BACKGROUND:\n The Juno spacecraft (New Frontiers mission-class) will investigate Jupiter's \n origins, interior structure, deep atmosphere and magnetosphere, from a highly \n elliptical polar orbit with a close perijove (PJ=1.06 Jupiter-radii, AJ= 39 \n Jupiter-radii), using a suite of seven science instruments.\n\n The Juno spacecraft launched aboard an Atlas V-551 rocket from Cape Canaveral, \n Fla., on Aug. 2011 at 16:25 UTC. It reached Jupiter in July 2016.  \n \n The spacecraft will orbit Jupiter 76 times during its mission (now extended\n into 2025 from its original pre-launch 19-month, 34-orbit plan), coming within\n 3,100 miles (5,000 kilometers) of the planet's cloud tops.\n\n MAJOR EVENTS \n  Launch        : Aug 5,  2011 16:25 UTC \n  Separation    : Aug 5,  2011 17:24:56.12  UTC\n  DSM-1         : Aug 30, 2012 22:29        UTC (344.95 m/s)\n  DSM-2         : Sep 3,  2012 22:29        UTC (387.77 m/s)\n  Shadow entry  : Oct 9,  2013 19:19:36     UTC (alt.= 7069 km, umbral)\n  Earth Flyby   : Oct 9,  2013 19:21:25     UTC (alt.= 558.848) \n                   (lat=-34.170 deg,E.long= 34.008 deg\n  Shadow exit   : Oct 9,  2013 19:39:01     UTC (alt.= 14896 km, umbral)\n  Arrive Jupiter: Jul 5,  2016 02:30 UTC    (JOI to 53.5-day capture orbit, \n                                             delta-v= 541.7 m/s)\n  Period Reduction Maneuver:\n                  Oct 19, 2016 (CANCELLED)  (Target 14-day orbit period,\n                                             delta-v= 395.2 m/s)\n  Ganymede flyby: Jun 07, 2021 (PJ34)       (1038 km from surface, per. 53->43 d) \n  Europa flyby  : Sep 29, 2022 (PJ45)       Period from 43->38 days\n  Io flybys     : Dec 30, 2023 (PJ57)\n                  Feb  3, 2024 (PJ58)       Period reduced to 33 days\n  End of mission: Sep   , 2025 (PJ76)       Jupiter impact, 700 km below\n                                             1-bar atmospheric pressure level)\n\n SPACECRAFT PHYSICAL  CHARACTERISTICS:\n  * Solar-powered, spin-stablized spacecraft \n  * 1 rpm in interplanetary cruise, 2 rpm in Jupiter orbit\n  * Three 2x9 m solar panels equally spaced around hexagonal bus (20 m span)\n  * High-gain antenna\n\n INSTRUMENTS: Juno's scientific payload includes:\n  * A gravity/radio science system\n  * A six-wavelength microwave radiometer for atmospheric sounding \n     and composition\n  * A vector magnetometer\n  * Plasma and energetic particle detectors\n  * A radio/plasma wave experiment\n  * An ultraviolet imager/spectrometer\n  * An infrared imager/spectrometer\n\n PROPULSION:\n  * Bipropellant engine: Leros 1B, thrust= 635 N,  Isp= 316.2 s min.\n  * RCS thrusters\n  * Orbit trim maneuvers (OTMs) occur on each orbit at perijove +4 hrs, \n     beginning at PJ3. Target desired longitude at descending node after \n     perijove.\n  * Total delta-V budget: 2107 m/s (~1852 m/s on bi-prop; remainder on RCS)\n\n SPACECRAFT TRAJECTORY (from JPL navigation team)\n   The trajectory after 2026-Sep-23 is a planning prediction.\n\n   Trajectory name                         Start (TDB)         Stop (TDB)\n   ------------------------------        -----------------   -----------------\n   spk_rec_110805_*_260824               2011-Aug-05 17:19   2026-Aug-24 23:03 \n   juno_pred_orbit                       2026-Aug-24 23:03   2026-Dec-19 07:13\n   spk_ref_260808_280902_260926          2026-Dec-19 07:13   2028-Sep-30 23:55\n*******************************************************************************\n"}