MODIS IOT Terra Weekly Report

Mission Operations Days: 2002/229 to 2002/235
August 16, 2002 20:00:00 GMT to August 23, 2002 20:00:00 GMT

Terra Spacecraft and MODIS Instrument Status:

This Week's Completed MODIS Activities:

2002/228 20:14:07-20:27:18 ATC OA16: SD/SDSM Screened, SDSM Fixed At Sun - A Side
2002/228 21:53:00-22:06:11 ATC OA15: SD/SDSM Open, SDSM Fixed At SD - A Side

None

2002/230 17:58:10 Real-Time MOD_MEM_HALT executed to clear FR LAST EVENT message 1B

2002/231 13:50:00 Real-Time MOD_MEM_HALT executed to clear FR LAST EVENT message 1B

2002/232 11:55:20 Real-Time MOD_MEM_HALT executed to clear FR LAST EVENT message 1B
2002/232 20:12:00 Real-Time Dumped FR LAST EVENT message 1B info

None

None

None

This Week's Scheduled MODIS Activities Not Completed:

None

Upcoming MODIS Events:

239/19:14:22 ATC MOD_OA04_NIGHT_RATE.1 (moved ahead 00:03:23 to even out day/night rate from roll)

239/19:42:34 - 19:49:20 ATC MOD_OA08_ROLL_MAN.3

239/19:42:34 ATC MOD_SET_FR_RATE, TO = DAY
239/19:42:36 ATC MOD_SET_FR_SCIABNORM, TO = ABNORM
239/19:42:38 ATC MOD_SET_FR_PC_DCRCMP, TO = OFF
239/19:42:40 ATC MOD_SET_FR_PV_DCRCMP, TO = OFF
239/19:42:42 ATC MOD_SET_FR_ENC_DELTA, TO = -3072
239/19:49:12 ATC MOD_SET_FR_ENC_DELTA, TO = 0
239/19:49:14 ATC MOD_SET_FR_PV_DCRCMP, TO = ON
239/19:49:16 ATC MOD_SET_FR_PC_DCRCMP, TO = ON
239/19:49:18 ATC MOD_SET_FR_SCIABNORM, TO = NORM
239/19:49:20 ATC MOD_SET_FR_RATE, TO = NIGHT

239/20:10:36 ATC MOD_OA03_DAY_RATE.1 (moved later by 00:03:23 to even out day/night rate from roll)

240/20:43:45 ATC OA16: SD/SDSM Screened, SDSM Fixed At Sun - A Side
240/22:22:38 ATC OA15: SD/SDSM Open, SDSM Fixed At SD - A Side

Maneuvers:

The next Terra MODIS Lunar Calibration Roll is scheduled for 2002/239 (August 27, 2002), with data collection from 19:42:36 to 19:49:18 GMT and a roll angle of -6.6816 degrees. The maneuver had to be moved forward an orbit from the previously published times to accommodate work scheduled for the only TDRS Spacecraft in view of Terra for the originally planned roll period.

The sixth Terra inclination adjust maneuver has been pushed back to an unspecified date in September to facilitate Lockheed Martin development at Valley Forge for products to support long term planning of possible future inclination maneuvers.

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

MODIS Anomalies:

The current patches loaded into the MODIS Formatter record the number of formatter error events, but not the address where they occurred. The error rate is approaching 56 million errors per day.

Intermittent bad frame count formatter event messages (xx1B) are being observed. This is one of the event messages being used to warn of potential impacts to the science data. The MODIS halt memory transfer command was being sent after each 1B-event message, but this has been discontinued. MODIS has had the FR LAST EVENT message memory dumped to find out where the 1B messages are coming from. The first dump shows that the 1B messages are happening during the scan of the SD sector.

The most recent error tracking spreadsheets can be retrieved from:

An MS Excel spreadsheet in a WinZip compressed archive called, AM1_FR_error_rollovers_current.zip contains the data for the times each error count "roll over" occurs.

General Instrument Comments:

MODIS is in A-side Science Mode with the blackbody maintained at 290K.

MODIS Telemetry Trends:

All systems appear to be functioning properly. Tracking of the Formatter Error Rate is continuing.

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: 201.0 of 500 hours
SRCA 10W Lamp #2: 152.8 of 500 hours
SRCA 10W Lamp #3: 162.0 of 500 hours
SRCA 10W Lamp #4: 61.5 of 500 hours

SRCA 1W Lamp #1: 559.8 of 4000 hours
SRCA 1W Lamp #2: 276.3 of 4000 hours

Solar Diffuser Door: 1901 of 3022 Movements
Nadir Aperture Door: 536 of 1316 Movements
Space View Door: 439 of 1316 Movements

Email the MODIS IOT to report any problem with the MODIS IOT Web Pages.
Email the MCST Webmaster to report any problem with the MCST Web Pages.
Email the MCST Helpdesk to ask a question about Level 1B usage, algorithms or software.

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