Mission Operations Days: 2002/166 to 2002/172
June 15, 2002 00:00:00 GMT to June 21, 2002 00:00:00 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 15, 2002
None
Sunday, June 16, 2002
None
Monday, June 17, 2002
None
Tuesday, June 18, 2002
2002/169 15:13:36 - 15:14:19 Real-time Load formatter patch to stop a background task register load associated with the formatter errors. MOD_MEM_LOAD('AM1_MPR_MODIS_FIE_MASK_NO',1,'N','DISABLE',1,1)
2002/169 15:14:47 - 15:15:19 Real-time Dump memory location of above formatter patch MOD_MEM_DUMP('FR_OPERAND',9672,0,1,1)
2002/169 15:15:32 - 15:15:45 Real-time Send halt CP RAM transfer command to clear xx1B formatter last event message MOD_MEM_HALT
Wednesday, June 19, 2002
2002/170 16:58 Real-time FOT commands Terra to low fidelity pointing for delta-v burn
2002/170 18:00:29 Real-time 13.6 second delta-v burn (2-1/2 minutes late)
2002/170 18:31 Real-time FOT commands Terra to high fidelity pointing after delta-v burn
2002/170 21:12:05 ATC OA-16: SD/SDSM Screened, SDSM fixed at the sun
2002/170 22:04:23 - 22:37:56 ATC OA-19: SRCA Full Radiometric Calibration, A-side
2002/170 22:51:58 ATC OA-15: SD/SDSM Open, SDSM fixed at the SD
Thursday, June 20, 2002
2002/171 00:47:04 - 00:49:35 ATC OA-27: PV Electronics Calibration
Friday, June 21, 2002
None
This Week's Scheduled MODIS Activities Not Completed:
None
Upcoming MODIS Events:
Lunar Calibration via roll maneuver, June 29th.
Maneuvers:
A 13.6 second duration delta-v (drag make-up) burn was successfully performed (two and one half minutes late) on June 19th, 2002 at 18:00:29. The burn was delayed because a command in the stored command load to turn off one of the line heaters appeared to not have been sent. It is believed that two relay commands in the stored command load were scheduled to occur at the same millisecond; 64 milliseconds are nominally required between these commands.
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 is now approaching 10 million errors per day.
A patch was attempted on Tuesday, June 18th, 2002 to prevent a register load from occurring 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