From go@orton.jpl.nasa.gov Thu Oct 31 10:00 MST 1996
Subject: Galileo mission status for the next AWG newsletter

Here is the C3 encounter timeline to allow ground-based observers to schedule simultaneous support.

GALILEO MISSION - ATMOSPHERIC WORKING GROUP:
CALLISTO-3 TIME ORDERED LISTING OF OBSERVATIONS

All times and dates are in spacecraft event time; add 46.5 min for light time.

Two features are primary targets; one is a belt/zone boundary with observations limited by 13 deg. S and 3 deg. N latitude. Another is at high northern latitudes for the purpose of correlation with in situ particle and field experiments.

Despite the names, all PPR observations are in a 37-micron filter; the PPR will also be observing other features on the planet, such as white ovals, ahead of the planned schedule - in case the filter wheel finally moves and the features are only observed in photo-polarimetric filters at the usually scheduled times.

NIMS = Near-Infared Mapping Spectrometer
PPR = Photopolarimeter-Radiometer
SSI = Solid-State Imager
UVS = Ultraviolet Spectrometer

Date Start Time End Time Activity Team

11/03/96 02:13:50 03:48:53 Auroral map UVS
11/03/96 19:53:29 20:58:12 Fixed longitude map UVS
11/03/96 20:58:12 22:29:12 Darkside map UVS
11/03/96 22:29:12 01:31:12 Fixed longitude map UVS

11/04/96 22:14:52 22:22:57 Jovian Auroral Region, Color View SSI

11/05/96 00:13:10 00:19:11 JUPITER CAMPAIGN FEATURE 51 DEG #1 NIMS
11/05/96 01:11:48 01:22:30 Jupiter Feature Track PP/PH Mode PPR
11/05/96 01:13:40 01:22:21 RECORD PRIME FEATURE AT 51 PPR
11/05/96 01:23:56 01:29:56 Jupiter Campaign Feature 53 deg #2 NIMS
11/05/96 01:30:00 01:42:08 Belt Zone Boundary, rot 1, em 2 SSI
11/05/96 01:38:06 01:47:12 Belt Zone Boundary Feature Track UVS
11/05/96 01:47:12 01:54:16 Belt Zone Boundary Feature Track UVS
11/05/96 02:11:28 02:19:33 First High Resolution, 2-Color SSI
11/05/96 02:43:49 02:49:49 Jupiter Campaign Feature 51 deg. #3 NIMS
11/05/96 03:37:24 03:45:30 Second High Resolution SSI
11/05/96 05:12:27 05:20:32 Jovian Auroral Region, Dark View SSI
11/05/96 05:22:34 07:58:16 AURORA FEATURE TRACK UVS
11/05/96 05:26:36 05:36:43 Jupiter NIMS TAR Real Time obs. #1 NIMS
11/05/96 07:03:40 07:15:43 Jupiter Feature Track (2) D Filter PPR
11/05/96 07:05:42 07:15:48 Jupiter NIMS TAR Real-Time Obs. #2 NIMS
11/05/96 07:15:43 07:43:30 Jupiter Feature Track Basic PPR
11/05/96 07:52:12 08:02:19 Jupiter NIMS TAR Real-Time Obs. #3 NIMS
11/05/96 08:02:15 08:12:20 TRANS AURORAL REGION PPR
11/05/96 08:23:29 08:49:12 WHITE OVAL PPR
11/05/96 09:57:03 10:22:20 RECORD NORTH/SOUTH STRIP PPR
11/05/96 10:23:52 10:36:00 Belt Zone Boundary, rot 2, em 1 SSI
11/05/96 10:31:58 10:41:04 Belt Zone Boundary Feature Track UVS
11/05/96 10:39:02 11:05:20 Jupiter North-South Stripe PPR
11/05/96 10:41:04 10:48:08 Belt Zone Boundary Feature Track UVS
11/05/96 11:38:42 11:44:20 Jupiter Campaign Feature Spectra NIMS
11/05/96 11:51:50 12:03:58 Belt Zone Boundary, rot 2, em 2 SSI
11/05/96 11:59:54 12:09:02 Belt Zone Boundary Feature Track UVS
11/05/96 12:09:02 12:28:14 Belt Zone Boundary Feature Track UVS
11/05/96 13:00:36 13:09:42 Belt Zone Boundary Feature Track UVS
11/05/96 13:09:42 13:16:46 Belt Zone Boundary Feature Track UVS
11/05/96 15:19:07 15:22:09 FEATURE TRACK BUFFER DUMP UVS
11/05/96 16:49:06 16:59:33 Jupiter Partial Feature Track #1 NIMS
11/05/96 19:41:00 20:04:15 Jupiter Campaign Feature 18 deg. #1 NIMS
11/05/96 20:47:30 21:40:04 Jupiter Basic Feature Track Support PPR
11/05/96 20:48:40 21:40:16 RECORD FEATURE 1 BASIC PPR
11/05/96 21:41:19 21:51:59 Jupiter Campaign Feature 18 deg. #4 NIMS
11/05/96 21:58:29 22:16:41 Jupiter Feature Track D Filter PPR
11/05/96 21:59:27 22:17:42 RECORD FEATURE 1 D FILTER PPR
11/05/96 23:02:26 23:19:47 RECORD FEATURE 1 RADIOMETRY PPR
11/05/96 23:04:12 23:19:44 Jupiter Feature Track 1 Rad Filter PPR

11/06/96 04:47:00 05:02:10 Jupiter North Pole Map #1 NIMS
11/06/96 05:10:15 06:05:52 Jupiter Aurora NIMS
11/06/96 21:46:12 21:56:48 Jupiter Feature Track PP/PH Mode PPR
11/06/96 21:47:08 21:55:42 RECORD PRIME FEATURE AT 102 PPR

11/07/96 05:23:13 05:39:24 Jupiter Campaign Feature 129 deg #1 NIMS
11/07/96 05:53:33 05:59:33 Jupiter Campaign Feature 129 deg #3 NIMS
11/07/96 07:26:34 07:47:48 Jupiter Feature: 5, 3 micron map NIMS
11/07/96 09:01:37 09:11:37 Jupiter Campaign Feature 5um Map NIMS
11/07/96 15:38:59 16:04:16 Jupiter Campaign Feature 150 deg #1 NIMS

11/08/96 09:23:00 18:28:00 Earth Occ by Jupiter RST
11/08/96 09:46:32 18:06:32 Earth Occultation by Jupiter RST
11/08/96 18:28:00 18:29:01 Earth Occ by Jupiter RST

11/09/96 04:35:20 04:39:23 Jovian Limb at W Equator and S Pole SSI
11/09/96 04:42:59 04:47:28 Search for Jovian Lightning SSI
11/09/96 04:47:28 04:51:31 Jupiter Southern Aurora, Short Exp SSI
11/09/96 04:51:31 04:55:03 Jupiter Southern Aurora, Med Exp SSI
11/09/96 04:55:03 05:00:37 Jupiter Southern Aurora, Long Exp SSI
11/09/96 05:00:37 05:04:09 Jupiter Lightning Search, High N SSI
11/09/96 05:04:09 05:08:12 Jupiter Lightning Search, Mid N SSI
11/09/96 05:08:12 05:13:15 Jupiter Lightning Search, Low N SSI
11/09/96 05:13:15 05:18:19 Jupiter Lightning Search, Low S SSI
11/09/96 05:18:19 05:22:51 Jupiter Lightning Search, Mid S SSI
11/09/96 05:22:51 05:26:54 Jupiter Lightning Search, High S SSI
11/09/96 05:41:03 06:53:51 North-south-east-west map UVS
11/09/96 05:52:11 06:02:17 Jupiter Occultation Spectrum NIMS
11/09/96 06:53:51 06:58:24 Jupiter Northern Aurora, Short Exp SSI
11/09/96 06:58:24 07:03:58 Jupiter Northern Aurora, Long Exp SSI
11/09/96 07:03:58 07:08:01 Jupiter Northern Aurora, V Sh Exp SSI

 Glenn Orton 1996 October 31

2. The following is a Galileo mission status report

PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
http://www.jpl.nasa.gov

GALILEO MISSION STATUS
October 30, 1996

The last of the data from the Galileo spacecraft's September encounter with Jupiter's moon Ganymede were due to be played back from the spacecraft's tape recorder by October 28th or 29th, project officials reported.

In the remaining hours of the playback from the last flyby, preparations continued for Galileo's next encounter - the Jovian moon Callisto - which takes place Monday, November 4 at 5:30 a.m. Pacific Standard Time (1:30 p.m.GMT).

The flight team has reported successful optical navigation imaging of Callisto and target stars in recent days. Ten images were shuttered and eight were successfully received last week. The spacecraft is on track for its 1,104 kilometer (686-mile) flyby of Callisto, so much so that the project has canceled the work that would have been needed to generate command sequence products for an orbit-trim maneuver. However an option still exists to execute an orbit trim maneuver later this week if the latest possible tracking data show that an adjustment is desirable.

Callisto is the outermost and, apparently, least active of Jupiter's four major Galilean satellites. It has the oldest, most cratered face of any body yet observed in the solar system. Like Ganymede, it seems to have a rocky core surrounded by ice. The surface is covered completely with meteoric impact craters. Although the exact rate of impact crater formation is not known, scientists estimate that it would require several billion years to accumulate the number of craters found on Callisto. Therefore, the moon is believed to have been inactive at least that long. Data from this Callisto flyby and another one in June next year should help resolve questions about why this seemingly inactive, crater-studded moon is so different from its vastly more active siblings - Europa, Ganymede and Io.

Galileo's ground data system team is making final preparations to use a new array of multiple antennas on separate continents that have been electronically linked together to receive data from Galileo. Use of the array for Galileo operations begins November 1. The telecommunications array links the receiving power of the three largest antennas (one 70-meter and two 34-meter antennas) at the Australian Deep Space Network communications complex in Tidbinbilla, near Canberra, along with the large Parkes radio telescope located about 100 miles from the Tidbinbilla site. It also links the 70-meter antenna at Goldstone during periods when both Goldstone and Canberra are able to "see" the Galileo spacecraft at the same time. The arraying technique allows more of the spacecraft's weak signal to be captured, thereby enabling a higher data rate, which translates into the receipt of more data.