Galileo Ganymede 2 Flyby Entry Timeline


Ganymede 2 Flyby was 06 September 1996

The second Ganymede flyby Galileo made was the closest Galileo will come to the satellite. During this time, observations were also be made of the Jovian magnetosphere as well as of the other satellites of Jupiter.

The problems with the Photopolarimeter-Radiometer (PPR) filter wheel continued. Attempts which occurred after the Ganymede 2 encounter to free the stuck filter wheel were unsuccessful. Engineers continue to look at the problem.

This flyby of Ganymede made by Galileo was the second of several close encounters of the Galilean satellites and the closest flyby Galileo will make to Ganymede. The distance Galileo came to Ganymede during this flyby was about 255 km altitude above the satellite (or about 1.1 Ganymede radii from Ganymede's center), some 56 times closer than Voyager 2 and more than 3 times closer than Galileo came during the first Ganymede flyby.

The following timeline is a list of different events which occurred beginning with the official start of the Ganymede encounter and proceding until the last data from the encounter were played back. The times are given in Universal Time (UTC) of the event at the spacecraft.

Date/Time             Instrument    Event
________              __________    _____
01 Sept 16:00                       Start of Ganymede 2 encounter

02 Sept 00:20         PWS           Jovian radio emission observation
        09:45                       Last Ganymede 2 OPNAV
        23:14         SSI           First Io monitoring observation

03 Sept 01:29         UVS           Last Ganymede 2 Io torus observation
        17:15         SSI           Shoemaker-Levy 9 impact zone observation
        17:20         NIMS          Shoemaker-Levy 9 impact zone observation
        23:47         UVS           Jupiter auroral map

04 Sept 19:25                       Orbital Trim Maneuver (OTM) 10

06 Sept 09:01         RS            Ganymede gravity field measurement
        17:27         NIMS/UVS      Ganymede north pole map
        18:31         F&P           Ganymede wake and wing recording
        18:35         SSI           Ganymede Anshar Sulcus
        18:45         SSI           Ganymede palimpsest
        19:00                       Ganymede closest approach (2,880 km)
        20:25                       Science turn (Jupiter stratospheric map)
        21:35         UVS           Jupiter stratospheric circulation map
        23:22                       Turn to return to Earth point

07 Sept 04:56         PPR           Io full disk map
        05:25                       Io closest approach (441,000 km)
        08:18         SSI           Amalthea full disk imaging
        13:37                       Jupiter closest approach (762,000 km)
        14:43         SSI           Europa low phase photometry
        17:06                       Europa closest approach (673,000 km)
        17:10         NIMS          Europs main circular feature
        21:59         PPR           Europa polarimetry

08 Sept 05:19         NIMS          Last Io monitoring observation
        13:23         SSI           Callisto low phase photometry
        16:00                       Start of data playback (Ganymede 2)
        23:31         PPR           Callisto polarimetry

09 Sept 10:24                       Callisto closest approach (424,000 km)
        10:27         NIMS          Callisto global coverage
        22:05                       Orbital Trim Maneuver (OTM) 11

12 Sept 02:38         F&P           Plasma sheet crossing recording

23 Sept 17:38                       Turn for attitude maintenance

08 Oct  15:05                       Orbital Trim Maneuver (OTM) 12

09 Oct  14:47                       First Callisto OPNAV (for Callisto 3)

27 Oct  18:33         EUV/UVS       First Io torus observation (Callisto 3)

31 Oct  00:08                       Last Callisto OPNAV (for Callisto 3)

01 Nov  14:05                       Orbital Trim Maneuver (OTM) 13

02 Nov  16:00                       End of data playback (Ganymede 2)

Other Event Related News


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Author/Curator:
Dr. Edwin V. Bell, II
Mail Code 690.1
NASA Goddard Space Flight Center
Greenbelt, MD 20771
+1-301-286-1187
ed.bell@nasa.gov
[NSSDC Logo]
NASA Official: Dr. Ed Grayzeck V1.0, 24 October 1996
Last Updated: Tuesday, 12-Aug-2014 12:05:53 EDT, EVB II