MODIS IOT Terra Weekly Report

Mission Operations Days: 2002/061 to 2002/067
March 2, 2002 20:00:00:00 GMT to March 8, 2002 20:00:00 GMT

Terra Spacecraft and MODIS Instrument Status:

This Week's Completed MODIS Activities:

None

MODIS Lunar Roll
2002/062 05:47:00 Lo Fi pointing
2002/062 07:12:11-07:18:41 Data Collection, -13.0011 degrees Roll Angle
2002/062 07:03:52 ATC MOD_OA04_NIGHT_RATE.1 FR Rate to NIGHT 00:03:23 EARLIER than normal. (This maintains 50/50 Day:Night data rate.)
2002/062 07:12:03-07:18:49 ATC MOD_OA08_ROLL_MAN.3
2002/062 07:12:03 FR Rate to Day
2002/062 07:12:05 FR Science ABNORMAL Flag Set
2002/062 07:12:07 FR PC DCR turned OFF
2002/062 07:12:09 FR PV DCR turned OFF
2002/062 07:12:11 FR Encoder Delta offset -3072 counts
2002/062 07:18:41 FR Encoder Delta reset to 0 offset
2002/062 07:18:43 FR PV DCR turned ON
2002/062 07:18:45 FR PC DCR turned ON
2002/062 07:18:47 FR Science NORMAL Flag Set
2002/062 07:18:49 FR Rate to Night
2002/062 07:31:00 Hi Fi pointing
2002/062 08:00:04 ATC MOD_OA03_DAY_RATE.1 FR Rate to DAY 00:03:23 LATER than normal. (This maintains 50/50 Day:Night data rate.)

2002/063 20:34:07 Real-Time FS1_EXEC_INHIB_ID_SET(34) Prevents ATC commands from moving the NAD and SVD
2002/063 20:34:39 Real-Time GS1_EXEC_INHIB_ID_SET(58) Prevents the ATC from powering the MODIS door driver

Terra inclination adjust maneuver #4
2002/064 15:17:30-15:25:00 Real-Time Spacecraft forward slew (yawed -90 degrees)
2002/064 15:25:00-15:40:30 Real-Time During this period the spacecraft performs 320 second inclination burn
2002/064 15:40:30-15:48:00 Real-Time Spacecraft return slew (yawed back 90 degrees)

None

None

None

This Week's Scheduled MODIS Activities Not Completed:

2002/064 15:48:50-15:50:31 ATC MOD_CLOSE_NAD_SVD.1 IAM Contingency to close the SVD and NAD before S/C Day. (This activity is scheduled -00:01:40 prior to S/C_Night/Day on orbit 11771, sequence 1, with a duration of 101 seconds.)
This activity was not performed due to the return slew completing nominally.

Upcoming Week's MODIS Events:

Bi-weekly SDSM activity.
Monthly SRCA Radiometric calibration activity.
Bi-monthly SRCA Spatial calibration activity.

Maneuvers:

There will be no MODIS Lunar Calibration at the beginning of April because the required roll angle will exceed the allowable limit.

There has been a change to the Terra inclination maneuver schedule. A new constraint has been imposed to have the maneuvers completed prior to the launch of the Aqua spacecraft (currently April 18, 2002). The (remaining) new inclination maneuver dates are March 19th and April 4th, 2002. This new plan violates a previous constraint of not performing more than two maneuvers in any 7-week period. Therefore, Flight Dynamics products for dates beyond the next two maneuvers will have inaccuracies.

The Terra Deep Space Calibration Maneuver is still postponed. The maneuver date is not expected until late summer of 2002.

MODIS Anomalies:

The Formatter Error Rate is still increasing with a buffer rollover time of about five hours and twenty minutes. The current error-logging plan to only monitor the first 15 noted addresses was deemed the best monitoring approach at present. Therefore, the current limit of 15 addresses will continue to be used.

Error tracking spreadsheets have been updated and can be retrieved from:

An MS Excel spreadsheet called, AM1_FR_error_rollovers_MMDDYY.xls contains the data for the times each of the error count "roll over" occurs (with the MMDDYY denoting the date the spreadsheet was made, the more recent date containing the most up-to-date information).

General Instrument Comments:

MODIS is in Science Mode on the A-side with the SVD and NAD open, operating with the Formatter Resolution Flight Software Patches (FRFSP) and a Formatter Time Code Patch.

MODIS Telemetry Trends:

No abnormal telemetry trends are being observed.

Non-MODIS Significant Events:

Science Data Loss Reports can be viewed at:

Select "Search Data Losses" and choose Data Type: MOD

Then press the big SUBMIT button.

Limited Life Item Status:

SRCA 10W Lamp #1: 195.9 of 500 hours
SRCA 10W Lamp #2: 149.0 of 500 hours
SRCA 10W Lamp #3: 158.2 of 500 hours
SRCA 10W Lamp #4: 61.5 of 500 hours

SRCA 1W Lamp #1: 559.0 of 4000 hours
SRCA 1W Lamp #2: 276.3 of 4000 hours

Solar Diffuser Door: 1817 of 3022 Movements
Nadir Aperture Door: 534 of 1316 Movements
Space View Door: 437 of 1316 Movements

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Last Update: Thursday, 04-Sep-2003 18:14:23 EDT