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Information sources

Juno orbit

  • Launch: "Juno launched at 16:25 UTC on August 5, 2011"
  • Centaur Final Cutoff: +50:34.2
  • Heliocentric orbit: "Atlas V supplied a launch energy (C3) of 31.1 km²/s² leaving its payload in a heliocentric orbit with an approximately 2-year period."
  • DSM:
    • "To avoid main engine problems, two DSMs were implemented in the mission profile, each with a length of about 30 minutes, with burns taking place two days prior and two days after aphelion."
    • "This resulted in DSMs being targeted for August 30 (dV: 345m/s) and September 4 [later delayed] (dV: 385m/s) which is the latest in the ELA window"
    • DSM-1: "DSM1 had a duration of 29 minutes and 39 seconds and changed the vehicle's velocity by 344 meters per second"
    • DSM-2: "DSM-2 had a slightly higher delta-V (change in velocity) than originally planned due to the delay from its original September 4 target.", "The maneuver slowed the Spacecraft down by 388 meters per second"
    • "The two DSMs have supplied a combined delta-V of 732 meters per second"
    • Perhaps I can approximate this by an orbit change at perihelion (around September 2) using the Lambert solution
  • Earth Fly-by:
    • "The Gravity Assist Flyby on October 9 supplies Juno with a delta-v (Velocity Change) of 7.3 Kilometers per second"
    • "at 19:21 UTC, Juno made its closest approach"
    • "Juno's Gravity Assist Flyby of Earth boosted the vehicle's velocity relative to the sun by 7.3 Kilometers [per second]"
    • "This boost placed Juno in a heliocentric orbit of approximately 0.98 by 5.44 astronomical units (for reference, prior to the flyby, Juno was in a 0.88 by 2.26-AU orbit)."
  • Jupiter Orbit Insertion Phase
    • "The phase ends one hour after the JOI Burn Ignition. JOI occurs on July 5, 2016 at [...] 3:18 UTC Earth Receive Time"