MODIS IOT Terra Weekly Report

Mission Operations Days: 2000/288 to 2000/294
October 13, 2000 20:00:00 GMT to October 20, 2000 20:00:00 GMT

Note: SMIR Itwk/Vdet were set to 79/110 from 2000/291 15:33:32 to 2000/291 17:27:04 and 2000/292 19:43:00 to 2000/294 13:29:13.

Terra Spacecraft and MODIS Instrument Status:

This Week’s Completed MODIS Activities:

None

None

None

Roll Maneuver #1:
2000/291 14:29:51 ATC Move Formatter to Night ahead by 3:23 to ensure 50/50 day/night
2000/291 15:02:17 ATC Set Formatter to Day Rate
2000/291 15:02:19 ATC Set SCIABNORM Flag to ABNORM
2000/291 15:02:21 ATC PC DC Restore to OFF
2000/291 15:02:23 ATC PV DC Restore to OFF
2000/291 15:02:25 ATC Sector Rotation to -3072 (EA to SV and OBCs)
2000/291 15:08:55 ATC Sector Rotation to Zero (Normal)
2000/291 15:08:57 ATC PC DC Restore to ON
2000/291 15:08:59 ATC PV DC Restore to ON
2000/291 15:09:01 ATC Set SCIABNORM Flag to NORM
2000/291 15:09:03 ATC Set Formatter to Night Rate
2000/291 15:26:03 ATC Move Formatter to Day later by 3:23 to ensure 50/50 day/night

2000/291 15:33:32 Real-Time Set SMIR Itwk/Vdet to 79/110

Roll Maneuver #2:
2000/291 16:08:45 ATC Move Formatter to Night ahead by 3:23 to ensure 50/50 day/night
2000/291 16:41:37 ATC Set Formatter to Day Rate
2000/291 16:41:39 ATC Set SCIABNORM Flag to ABNORM
2000/291 16:41:41 ATC PC DC Restore to OFF
2000/291 16:41:43 ATC PV DC Restore to OFF
2000/291 16:41:45 ATC Sector Rotation to -3072 (EA to SV and OBCs)
2000/291 16:48:15 ATC Sector Rotation to Zero (Normal)
2000/291 16:48:17 ATC PC DC Restore to ON
2000/291 16:48:19 ATC PV DC Restore to ON
2000/291 16:48:21 ATC Set SCIABNORM Flag to NORM
2000/291 16:48:23 ATC Set Formatter to Night Rate
2000/291 17:04:56 ATC Move Formatter to Day later by 3:23 to ensure 50/50 day/night

2000/291 17:27:04 Real-Time Set SMIR Itwk/Vdet to 110/226

2000/292 19:43 Real-Time Set SMIR Itwk/Vdet to 79/110
2000/292 20:05:00 ATC Blackbody to 315K
2000/292 20:05:30 ATC Blackbody duty cycle to FULL

2000/293 03:00:00 ATC Blackbody to 270K
2000/293 03:00:30 ATC Blackbody duty cycle to THIRD
2000/293 16:05 Real-time Set Inhibit ID 37 (MODIS Formatter commands)
2000/293 16:55 Real-time Set Formatter to Day Rate
2000/293 16:56 Real-time Clear Inhibit ID 37 (MODIS Formatter commands)
2000/293 22:00:00 ATC Blackbody to 290K
2000/293 23:38:14 Real-time Set Inhibit ID 37 (MODIS Formatter commands)

2000/294 00:34:55 Real-time Set Formatter to Night Rate
2000/294 00:35:45 Real-time Clear Inhibit ID 37 (MODIS Formatter commands)
2000/294 05:55:00 ATC PV Ecal
2000/294 05:59:00 ATC PC Ecal
2000/294 09:07:35 ATC OA-16: SD/SDSM Screened
2000/294 10:46:28 ATC OA-15: SD/SDSM Open
2000/294 13:29:13 Real-Time Set SMIR Itwk/Vdet to 110/226
2000/294 14:04:15 ATC OA-16: SD/SDSM Screened
2000/294 15:43:08 ATC OA-15: SD/SDSM Open

This Week's Scheduled MODIS Activities Not Completed:

2000/290 21:56:02-22:53:33 ATC SRCA Full Spatial TMON #66, SRCA A-side lamp current/voltage monitor tripped at the beginning of the 30W portion of the macro.

The first attempt to capture 15 minutes of day rate data over ground-track night failed. During this time, 3 minutes of night rate data were recorded over ground-track day.

Upcoming MODIS Events:

No activities have been planned for the upcoming week.

Maneuvers:

The next delta-v maneuver is scheduled for November 1st, 2000.

MODIS Anomalies:

TMON #66, the MODIS SRCA A-side lamp current/voltage monitor tripped on day 2000/290 shortly after beginning the 30W lamp portion of the macro. The TMON set the lamp usage to OFF, turned off the SRCA, and set inhibit ID #54 (MODIS SRCA commands). Because of this, the SRCA Filter wheel was left at step 100 rather than the home position.

A transient high current to the lamps appears to be a normal characteristic of the lamps. At this time, investigation is continuing to determine a possible correction to the TMON algorithm or alternate SRCA operating philosophy.

Continued monitoring for formatter errors and loss of cooler margin.

Attached to this report is a spreadsheet listing the times, addresses, formatter temperature, satellite ground track, and space craft day/night position for a select number of the formatter events that have occurred since DOY 256. The current event count is 2507. Due to the high number of recent events, not all have been updated in the anomaly log.

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.

MODIS Telemetry Trends:

The Radiative Cooler intermediate stage temperature has slowly been increasing since approximately day 240. During this time the LWIR focal plane heater margin has been decreasing. The IOT is continuing to trend these telemetry mnemonics.

Non-MODIS Significant Events:

None.

Limited Life Item Status:

SRCA 10W Lamp #1: 173.5 of 500 hours
SRCA 10W Lamp #2: 135.9 of 500 hours
SRCA 10W Lamp #3: 145.1 of 500 hours
SRCA 10W Lamp #4: 61.5 of 500 hours

SRCA 1W Lamp #1: 556.1 of 4000 hours
SRCA 1W Lamp #2: 276.3 of 4000 hours

Solar Diffuser Door: 1441 of 3022 Movements
Nadir Aperture Door: 532 of 1316 Movements
Space View Door: 437 of 1316 Movements

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Last Update: Tuesday, 14-Jan-2003 19:37:04 EST