Galileo Callisto 9 Flyby Entry Timeline

Callisto 9 Flyby was 25 June 1997

Galileo's second flyby of Callisto (also known as the Callisto 9 flyby because it took place during Galileo's ninth orbit around Jupiter), the second largest of Jupiter's Galilean satellites, occurred on 25 June 1997 at 13:47 UTC. At that time, Galileo came about 416 km from the surface of Callisto (or less than 1.2 Callisto radii from its center). This is the closest that Galileo came to Callisto during its prime mission and is less than half the distance to Callisto's surface than the first flyby which occurred on the third orbit in November 1996. During this time, observations were also be made of the Jovian magnetosphere as well as of the other satellites of Jupiter. Especially noteworthy during this particular orbit were images of Jupiter's satellites Thebe (roughly 50 km in size) and Adrastea (about 10 km) as well as more images of Metis (about 20 km).

The following timeline is a list of different events which will occur beginning with the official start of the Callisto 9 (the number actually refers to the Galileo orbit number) 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
________              __________    _____
22 Jun  16:00                       Start of Callisto 9 encounter

23 Jun  06:18                       Orbital Trim Maneuver (OTM) 29

25 Jun  06:04                       Science Turn (Callisto encounter)
        11:42         PPR           Callisto dark map
        13:26         F&P           Callisto closest approach recording
        13:39                       Start Earth occultation by Callisto
        13:40                       Start Sun occultation by Callisto
        13:47                       Callisto closest approach (2,820 km)
        13:56                       End Earth occultation by Callisto
        13:58                       End Sun occultation by Callisto
        14:26         NIMS/UVS      Callisto Skuld crater observation
        15:11         SSI           Callisto Valhalla region observation
        19:04                       Turn to return to Earth point

26 Jun  01:26         SSI           First Great Red Spot observation
        05:57         SSI           First plume head observation
        06:27         UVS           First Jupiter aurora observation
        06:56         SSI           Thebe imaging
        13:11         SSI           Adrastea imaging
        17:19                       Ganymede closest approach (82,600 km)
        17:46         SSI           Ganymede Perrine/Galileo Regio
        18:38         PPR           Ganymede polarimetry
        21:53         NIMS          Ganymede global mosaic
        23:35         SSI           Amalthea imaging

27 Jun  10:09                       Europa closest approach (1,200,000 km)
        10:33         NIMS          First Io monitoring observation
        11:25         SSI           Metis imaging
        11:52                       Jupiter closest approach (770,000 km)

28 Jun  02:31                       Io closest approach (607,000 km)
        13:50         F&P           Jupiter aurora recording
        14:01         UVS           Last Jupiter aurora observation
        15:59         NIMS          Last Great Red Spot observation
        20:27         NIMS          Last Io monitoring observation
        21:12         NIMS          Last plume head observation

29 Jun  16:00                       Start of data playback (Callisto 9)

10 Jul  18:00                       Orbital Trim Maneuver (OTM) 30

14 Jul  07:27                       Science turn (instrument calibration)
        12:41                       Turn to return to Earth point

23 Jul  14:19         F&P           Dusk magnetotail observation (130 RJ)

29 Jul  11:54                       Start Sun occultation by Jupiter

30 Jul  18:40                       End Sun occultation by Jupiter

01 Aug  10:26                       Start Earth occultation by Jupiter

02 Aug  11:42                       End Earth occultation by Jupiter

07 Aug  11:06         F&P           First apojove magnetotail observation
        13:36         F&P           Second apojove magnetotail observation

08 Aug  17:45                       Orbital Trim Maneuver (OTM) 31

09 Aug  16:00                       Turn for attitude maintenance

23 Aug  14:07         F&P           Dawn magnetotail observation (130 RJ)

03 Sep  02:45                       Science turn (high-phase Jupiter)
        05:56         SSI           Jupiter high solar phase observation
        06:31                       Turn to return to Earth point

10 Sep  05:13                       First Callisto 10 approach OPNAV
        11:25                       Science turn (high-phase Jupiter)
        14:26         SSI           Jupiter high solar phase observation
        15:01                       Turn to return to Earth point

12 Sep  20:45                       Last Callisto 10 approach OPNAV

14 Sep  00:00                       End of data playback (Callisto 9)

Other Event Related News

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Dr. Edwin V. Bell, II
Mail Code 690.1
NASA Goddard Space Flight Center
Greenbelt, MD 20771
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NASA Official: Dr. Ed Grayzeck V1.0, 17 December 1996
Last updated: 07 February 2002, EVB II