Mission Operations Days: 2002/180 to 2002/186
June 29, 2002 00:00:00 GMT to July 05, 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:
Friday, June 28, 2002
None
Saturday, June 29, 2002
Lunar Roll Maneuver (-15.6672 degree roll)
i2002/180 12:28:00 (S/C went to Low Fidelity Pointing)
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 13:44:00 (S/C went to High Fidelity Pointing)
2002/180 13:49:59 ATC MOD_SET_FR_RATE, TO = DAY
Sunday, June 30, 2002
None
Monday, July 1, 2002
None
Tuesday, July 2, 2002
None
Wednesday, July 3, 2002
2002/184 21:29:34 ATC OA16: SD Screened SDSM fixed at Sun, A-side
2002/184 23:08:27 ATC OA15: SD Open SDSM fixed at SD, A-side
Thursday, July 4, 2002
None
Friday, July 5, 2002
None
This Week's Scheduled MODIS Activities Not Completed:
None
Upcoming MODIS Events:
2002/210 MODIS Lunar Roll of -7.7199 degrees
Maneuvers:
The roll maneuver on 2002/180 was successful.
There was an MDA (Motor Drive Assembly) hit on the High Gain Antenna (HGA) during the contact before the maneuver. The "hit" happens occasionally, and is caused by high-energy particle impacts. The result is that the tracking of the HGA momentarily halts. The on board hardware and software autonomously regain control and then return to correct tracking of the antenna. For a brief period of time the telemetry from the spacecraft was interrupted.
Since telemetry returned and the software's and hardware's expected response to the HGA's MDA hit occurred as designed, the FOT felt there was no risk in performing the upcoming maneuver. Inhibit IDs for the stored commands for the maneuver were cleared, and the maneuver performed as expected.
The next Terra MODIS Lunar Calibration Roll is scheduled for 2002/210 (July 29, 2002), from 05:11:33 to 05:18:03 GMT (6 minutes 30 seconds data collection period) with a roll angle of -7.7199 degrees.
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:
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 over 20 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: 1877 of 3022 Movements
Nadir Aperture Door: 536 of 1316 Movements
Space View Door: 439 of 1316 Movements