The Galileo spacecraft was launched by the Space Shuttle Atlantis on October 18, 1989. A two-stage Inertial Upper Stage propelled Galileo out of Earth parking orbit to begin its 6-year interplanetary transfer to Jupiter. Galileo has already received two gravity assists: from Venus on February 10, 1990 and from Earth on December 8, 1990. After a second gravity-assist flyby of Earth on December 8, 1992, Galileo will have achieved the energy necessary to reach Jupiter. Galileo's interplanetary trajectory includes a close flyby of asteroid 951-Gaspra on October 29, 1991, and, depending on propellant availability and other factors, there may be a second asteroid flyby of 243-Ida on August 28, 1993. Upon arrival at Jupiter on December 7, 1995, the Galileo Orbiter will relay data back to Earth from an atmospheric Probe which is released five months earlier. For about 75 min, data is transmitted to the Orbiter from the Probe as it descends on a parachute to a pressure depth of 20–30 bars in the Jovian atmosphere. Shortly after the end of Probe relay, the Orbiter ignites its rocket motor to insert into orbit about Jupiter. The orbital phase of the mission, referred to as the satellite tour, lasts nearly two years, during which time Galileo will complete 10 orbits about Jupiter. On each of these orbits, there will be a close encounter with one of the three outermost Galilean satellites (Europa, Ganymede, and Callisto). The gravity assist from each satellite is designed to target the spacecraft to the next encounter with minimal expenditure of propellant. The nominal mission is scheduled to end in October 1997 when the Orbiter enters Jupiter's magnetotail.
Atmospheric Structure Instrument
Energetic Particles Instrument
High Gain Antenna
Inertial Upper Stage
Jupiter Orbit Insertion
Jet Propulsion Laboratory
Lightning and Radio Emissions Detector
National Aeronautics and Space Administration
Near-Infrared Mapping Spectrometer
Orbit Deflection Maneuver
Orbit Trim Maneuver
Perijove Raise Maneuver
Pacific Daylight Time
Pacific Standard Time
Radio Relay Antenna
Solid State Imaging
Trajectory Correction Maneuver
Universal Time Coordinated
Venus-Earth-Earth Gravity Assist
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D'Amario, L.A., Bright, L.E. & Wolf, A.A. Galileo trajectory design. Space Sci Rev 60, 23–78 (1992). https://doi.org/10.1007/BF00216849
- Space Shuttle
- Rocket Motor
- Close Encounter
- Orbital Phase
- Minimal Expenditure