Galileo's fourth flyby of Ganymede (also known as the Ganymede 8 flyby because it took place during Galileo's eighth orbit around Jupiter), the largest of Jupiter's Galilean satellites, occurred on 07 May 1997 at 15:57 UTC. At that time, Galileo came about 1485 km from the surface of Ganymede (or about 1.6 Ganymede radii from its center). As measured to the center of Ganymede, this is 0.4 times farther away than Galileo came to Ganymede during its closest approach on its second orbit back in September 1996. During this time, observations were also made of the Jovian magnetosphere as well as of the other satellites of Jupiter. Especially noteworthy during this particular orbit will be images of Jupiter's satellites Elara (approximately 40 km in size) and Metis (about 20 km).
The following timeline is a list of different events which will occur beginning with the official start of the Ganymede 8 encounter and proceding until the last data from the encounter are played back. The times are given in Universal Time (UTC) of the event at the spacecraft.
Date/Time Instrument Event ________ __________ _____ 04 May 16:00 Start of Ganymede 8 encounter 16:30 Orbital Trim Maneuver (OTM) 26 05 May 00:00 UVS Elara observing 10:10 Science Turn (Io plume monitoring) 06 May 09:33 SSI First Io monitoring observation 11:13 NIMS/UVS Callisto south pole observation 12:08 SSI Callisto south pole imaging 12:11 Callisto closest approach (35,900 km) 12:56 PPR Callisto polarimetry/thermal observation 22:30 F&P Plasma sheet/aurora recording 23:37 NIMS/UVS Jupiter auroral asymmetry map 07 May 01:10 UVS Jupiter auroral variability map 07:31 Io closest approach (956,000 km) 11:17 UVS First south polar haze zone observation 13:18 NIMS Ganymede Osiris observing 13:38 PPR Ganymede dayside thermal observation 14:35 SSI Ganymede Tiamat Sulcus 15:38 F&P Ganymede closest approach recording 15:56 Start Earth occultation by Ganymede 15:57 Start Sun occultation by Ganymede Ganymede closest approach (4,120 km) 16:03 End Earth occultation by Ganymede 16:05 End Sun occultation by Ganymede 19:04 Turn to return to Earth point 19:58 NIMS Last Io monitoring observation 08 May 09:49 Europa closest approach (1,290,000 km) 11:42 Jupiter closest approach (663,000 km) 16:34 SSI Metis imaging 10 May 23:18 NIMS Last south polar haze zone observation 11 May 02:00 Orbital Trim Maneuver (OTM) 27 16:00 Start of data playback (Ganymede 8) 13 May 14:00 F&P End Ganymede 8 real-time survey 25 May 05:04 RS Start Earth occultation observing 09:36 Start Earth occultation by Jupiter 26 May 03:52 End Earth occultation by Jupiter 08:25 RS End Earth occultation observing 02 Jun 16:00 F&P Start second magnetosphere mini-tour 03 Jun 03:00 Orbital Trim Maneuver (OTM) 28 18 Jun 05:30 First Callisto 9 approach OPNAV 21 Jun 01:45 Last Callisto 9 approach OPNAV 22 Jun 16:00 End of data playback (Ganymede 8)
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