Mission Operations Days: 2002/033 to 2002/039
February 02, 2002 00:00:00 GMT to February 08, 2002 00:00:00 GMT
Terra Spacecraft and MODIS Instrument Status:
| AM-1 "Terra" is in Normal Mode PFM 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 + 3 set 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, February 1, 2002
Lunar Roll Maneuver (-3.4357 degree roll)
2002/032 19:46:30 Real-time FOT disables wheel speed controller (Low fidelity pointing)
2002/032 20:19:13 ATC MODIS formatter to DAY rate
2002/032 20:19:15 ATC MOD_SET_FR_SCIABNORM set to ABNORM (abnormal)
2002/032 20:19:17 ATC MOD_SET_FR_PC_DCRCMP set to OFF
2002/032 20:19:19 ATC MOD_SET_FR_PV_DCRCMP set to OFF
2002/032 20:19:21 ATC MOD_SET_FR_ENC_DELTA sets sector scan to the 3072 position.
2002/032 20:25:51 ATC MOD_SET_FR_ENC_DELTA sets sector scan to the 0 position.
2002/032 20:25:53 ATC MOD_SET_FR_PV_DCRCMP set to ON
2002/032 20:25:55 ATC MOD_SET_FR_PC_DCRCMP set to ON
2002/032 20:25:57 ATC MOD_SET_FR_SCIABNORM set to NORM (normal)
2002/032 20:25:59 ATC MODIS formatter to NIGHT rate
2002/032 20:35:00 Real-time FOT sets IRU to Low Rate (High fidelity pointing)
Saturday, February 2, 2002
None
Sunday, February 3, 2002
None
Monday, February 4, 2002
None
Tuesday, February 5, 2002
2002/036 23:14 Real-time Set Inhibit IDs 34 & 58 via FOT TMON test
Wednesday, February 6, 2002
Inclination Maneuver #2 of 6, (FOT commanding)
2002/037 14:45:40 Real-time FOT disables wheel speed controller (Low fidelity pointing)
2002/037 15:41:26 Real-time Clear Inhibit IDs 34 & 58
2002/037 15:44:57 Real-time Begin forward slew to 90 degrees yaw offset
2002/037 15:52:27 Real-time End forward slew
2002/037 15:54:38 Real-time Begin 320 second inclination burn
2002/037 15:59:58 Real-time End 320 second inclination burn
037:16:01:40 Real-time Begin return slew to nominal 0 degrees yaw offset
2002/037 16:08:12 Real-time Set Inhibit ID 58
2002/037 16:08:28 Real-time Set Inhibit ID 34
2002/037 16:09:10 Real-time End return slew
2002/037 16:48:00 Real-time FOT sets IRU to low rate (High fidelity pointing)
2002/037 17:33:24 Real-time Clear Inhibit ID 58
2002/037 17:33:48 Real-time Clear Inhibit ID 34
Thursday, February 7, 2002
None
Friday, February 8, 2002
None
This Week's Scheduled MODIS Activities Not Completed:
Wednesday, February 6, 2002
2002/037 16:10:27 ATC MOD_CLOSE_NAD_SVD Close the NAD and SVD if the spacecraft does not return to nominal pointing after the inclination burn.
Upcoming Week's MODIS Events:
SDSM fixed sun/SD calibrations will be scheduled for Wednesday, February 13th (2002/044).
An SRCA Full Radiometric A-side calibration will be scheduled for Wednesday, February 13th (2002/044).
A flight software patch will be loaded to the instrument to correct a known problem which allows time values in the MODIS data headers to have a value of 1000 (milliseconds) when the maximum should be 999. EDOS discards data that have invalid time values in the data headers.
Maneuvers:
This week's roll maneuver performed nominally. The next MODIS Lunar Calibration via a spacecraft roll maneuver is scheduled for March 3rd, 2002 (DOY 2002/062) with data collection from 07:12:11 to 07:18:41. The roll angle will be -13.0011 degrees.
A 30 second Drag Make-Up (DMU) maneuver is planned for Tuesday, February 12th, 2002 (2002/043) at 18:38 GMT.
There has been a change to the Terra inclination maneuver schedule. A new constraint has been imposed to have the maneuvers completed prior to the launch of the Aqua spacecraft (currently 4-18-02). The new inclination maneuver dates are February 26th, March 5th, March 19th, and April 4th, 2002. This new plan violates a previous constraint of not performing more than two maneuvers in any 7-week period. Therefore, Flight Dynamics products for dates beyond the next two maneuvers will have inaccuracies.
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 Formatter Error Rate is still increasing with a buffer rollover time of about five hours and forty minutes. The fifteen slot buffer that records the flight software address executing at the time of the error has been filling much more quickly. This buffer was previously filling over a matter of weeks, but now all fifteen slots are being used within two days. At this time, the buffer is full and no new addresses are being recorded. A flight software patch may be loaded to the instrument to increase the size of the buffer. This is still under investigation.
Error tracking spreadsheets have been updated and 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_MMDDYY.xls contains the data for the times each of the error count "roll over" occurs (with the MMDDYY denoting the date the spreadsheet was made, the more recent date containing the most up-to-date information).
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 (FRFSP).
MODIS Telemetry Trends:
No abnormal telemetry trends are being observed.
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: 195.7 of 500 hours
SRCA 10W Lamp #2: 148.83 of 500 hours
SRCA 10W Lamp #3: 158.03 of 500 hours
SRCA 10W Lamp #4: 61.5 of 500 hours
SRCA 1W Lamp #1: 558.9 of 4000 hours
SRCA 1W Lamp #2: 276.3 of 4000 hours
Solar Diffuser Door: 1805 of 3022 Movements
Nadir Aperture Door: 534 of 1316 Movements
Space View Door: 437 of 1316 Movements