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MODIS IOT Terra Weekly Report
Mission Operations Days: 2002/173 to 2002/179
June 21, 2002 20:00:00 GMT to June 28, 2002 20:00:00 GMT
Terra Spacecraft and MODIS Instrument Status:
|
Terra (AM-1) is in Normal Mode MODIS is in A-side Science Mode |
||
| Component | State(s) | Comment |
|---|---|---|
| Blackbody | A On (290 K); B Off | Nominal |
| Calibration Electronics | A On; B Off | Nominal |
| Control Processor | A On; B Off | Nominal |
| Nadir Door | Unlatched, Open | Nominal |
| Space View Door | Unlatched, Open | Nominal |
| Solar Diffuser Door | Unlatched, Closed | Nominal |
| FDDI Formatter | A On; B Off | Nominal |
| FDDI Port | A On; B Off | Nominal |
| FIFO Memory | #1 & #2 On; #3 & #4 Off | Nominal |
| Format Processor | A On; B Off | Nominal |
| Power Supplies | #1 On, #2 Off | Nominal |
| PV VIS FPA | A On; B Off | Nominal |
| PV NIR FPA | A On; B Off | Nominal |
| PV SMIR FPA | A On; B Off | Nominal |
| PV LWIR FPA | A On; B Off | Nominal |
| PC LWIR FPA | A On; B Off | Nominal |
| RC Outgas Heaters | All Off (CS, IS, OS) | Nominal |
| RC LWIR FPA Heater | On (83 K) | Nominal |
| RC SMIR FPA Heater | Off | Nominal |
| Scan Assembly | A On; B Off | Nominal |
| SDSM | Off | Nominal |
| SRCA | Off | Nominal |
| PS1 Survival Heater | Enabled | Nominal |
| PS2 Survival Heater | Enabled | Nominal |
| Timing Generator | A On; B Off | Nominal |
| Flight Software | Rev BD + 7 sets of patches
| Nominal |
| Inhibit Ids Set | None | Nominal |
| TMON 66 | Disabled | Nominal |
| TMON 67 | Disabled | Nominal |
| TMON 68 | Enabled | Nominal |
| TMON 69 | Disabled | Nominal |
This Week's Completed MODIS Activities:
Saturday, June 22, 2002None
Sunday, June 23, 2002None
Monday, June 24, 2002None
Tuesday, June 25, 2002None
Wednesday, June 26, 2002None
Thursday, June 27, 2002None
Friday, June 28, 2002None
This Week's Scheduled MODIS Activities Not Completed:
None
Upcoming MODIS Events:
The following events are scheduled for the Lunar Roll Maneuver on Saturday, June 29, 2002:
2002/180 12:53:44 ATC MOD_SET_FR_RATE, TO = NIGHT 2002/180 13:06:43-13:13:29 MOD_OA08_ROLL_MAN.3 2002/180 13:06:43 ATC MOD_SET_FR_RATE, TO = DAY 2002/180 13:06:45 ATC MOD_SET_FR_SCIABNORM, TO = ABNORM 2002/180 13:06:47 ATC MOD_SET_FR_PC_DCRCMP, TO = OFF 2002/180 13:06:49 ATC MOD_SET_FR_PV_DCRCMP, TO = OFF 2002/180 13:06:51 ATC MOD_SET_FR_ENC_DELTA, TO = -3072 2002/180 13:13:21 ATC MOD_SET_FR_ENC_DELTA, TO = 0 2002/180 13:13:23 ATC MOD_SET_FR_PV_DCRCMP, TO = ON 2002/180 13:13:25 ATC MOD_SET_FR_PC_DCRCMP, TO = ON 2002/180 13:13:27 ATC MOD_SET_FR_SCIABNORM, TO = NORM 2002/180 13:13:29 ATC MOD_SET_FR_RATE, TO = NIGHT 2002/180 13:49:59 ATC MOD_SET_FR_RATE, TO = DAY
The MOD_SET_FR_RATE before and after the MOD_OA08_ROLL_MAN activity balance the FR data collection time. They are 3 minutes and 23 seconds earlier/later (respectively) than they would normally occur. This offsets the additional 6 minutes and 46 seconds of day rate data collected during the ground track in night for the time of the maneuver.
Maneuvers:
The next MODIS Lunar Calibration will be on June 29, 2002 (DOY 2002/180). The roll angle for this activity will be -15.6745 degrees.
The sixth Terra inclination adjust maneuver is tentatively being planned for July 17th, 2002.
The Terra Deep Space Calibration Maneuver is still postponed. The maneuver date is not expected until late summer of 2002.
MODIS Anomalies:
Formatter Error Events: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 was last noted at 12.99 million errors per day.
A patch was attempted on Tuesday, June 18th, 2002 to prevent the occurrence of register load from every pass through the flight software background task. This software address for with this register load had previously been associated with over 80% of the formatter errors. The patch was successfully loaded (and the contents verified by a memory dump), but there was no discernable decrease in the error rate.
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 is being sent after each 1B-event message. This command triggers both a CP and FR event message and thus "clears" the current MOD_SS_FR_LAST_EVENT message of the xx1B value.
The most recent error tracking spreadsheets can be retrieved from:
ftp://ftp.mcst.ssai.biz/pub/permanent/IOT/am1/analysis/FR_events/An MS Excel spreadsheet called, AM1_FR_error_rollovers_current.xls 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:
http://jupiter02.gsfc.nasa.gov:591/ssrloss/Select "Search Data Losses" and choose Data Type: MOD
Then press the big SUBMIT button.
Limited Life Item Status:
SRCA 10W Lamp #1: 200.7 of 500 hours
SRCA 10W Lamp #2: 152.5 of 500 hours
SRCA 10W Lamp #3: 161.7 of 500 hours
SRCA 10W Lamp #4: 61.5 of 500 hours
SRCA 1W Lamp #1: 559.7 of 4000 hours
SRCA 1W Lamp #2: 276.3 of 4000 hours
Solar Diffuser Door: 1871 of 3022 Movements
Nadir Aperture Door: 536 of 1316 Movements
Space View Door: 439 of 1316 Movements
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Last Update: Thursday, 04-Sep-2003 18:14:23 EDT
