Mission Operations Days: 2005/183 to 2005/189
July 02, 2005 00:00:00 GMT to July 08, 2005 00:00:00 GMT
Aqua Spacecraft and MODIS Instrument Status:
| PM-1 "Aqua" is in Fine Pointing Normal Mode FM1 MODIS is in B-Side Nominal Science Mode |
||
|---|---|---|
| Component | State(s) | Comment |
| Blackbody | A Off; B On (285K) | Nominal Science Mode |
| Calibration Electronics | A Off; B On | Nominal Science Mode |
| Control Processor | A Off; B On | Nominal Science Mode |
| Nadir Door | Unlatched, Open | Nominal Science Mode |
| Space View Door | Unlatched, Open | Nominal Science Mode |
| Solar Diffuser Door | Unlatched, Closed | Nominal Science Mode |
| FDDI Formatter | A Off; B On | Nominal Science Mode |
| FDDI Port | A Off; B On | Nominal Science Mode |
| FIFO Memory | #1 & #2 Off; #3 & #4 On | Nominal Science Mode |
| Format Processor | A Off; B On | Nominal Science Mode |
| Power Supplies | #1 Off, #2 On | Nominal Science Mode |
| PV VIS FPA | A Off; B On | Nominal Science Mode |
| PV NIR FPA | A Off; B On | Nominal Science Mode |
| PV SMIR FPA | A Off; B On | Nominal Science Mode |
| PV LWIR FPA | A Off; B On | Nominal Science Mode |
| PC LWIR FPA | A Off; B On | Nominal Science Mode |
| RC Outgas Heaters | All 3 (CS, IS, OS) Off | Nominal Science Mode |
| RC LWIR FPA Heater | Off | Nominal Science Mode |
| RC SMIR FPA Heater | On (83K) | Nominal Science Mode |
| Scan Assembly | A Off; B On | Nominal Science Mode |
| SDSM | Off | Nominal Science Mode |
| SRCA | Off
|
Nominal Science Mode |
| PS1 Survival Heaters | Enabled | Nominal Science Mode |
| PS2 Survival Heaters | Enabled | Nominal Science Mode |
| Timing Generator | A Off; B On | Nominal Science Mode |
| Flight Software | Rev BJ + 1 set of patches
|
Nominal Science Mode |
| Inhibit Ids Set | None | Nominal Science Mode |
This Week’s Completed MODIS Activities:
Saturday, July 2, 2005
None
Sunday, July 3, 2005
None
Monday, July 4, 2005
None
Tuesday, July 5, 2005
None
Wednesday, July 6, 2005
None
Thursday, July 7, 2005
None
Friday, July 8, 2005
2005/189 18:15:06-18:15:46 MOD_MEM_PM_DUMP('motor_constants',35,0,0,1,2)
2005/189 18:16:05-18:16:44 MOD_MEM_PM_DUMP('motor_trigger_data',60,0,0,1,2)
2005/189 18:16:58-18:17:26 MOD_MEM_PM_DUMP('motor_pos_when_hit',12,0,0,1,1)
2005/189 18:17:37-18:18:04 MOD_MEM_PM_DUMP('door_data',12,0,0,1,21)
This Week’s Scheduled MODIS Activities Not Completed:
None
Upcoming MODIS Events:
Calibrations for July will include biweekly SDSM, monthly SRCA Full Radiometric, and quarterly blackbody.
Monday, July 11, 2005
2005/192 21:13:45-21:27:43 MCL MOD_OA16_SDSM_SCREEN.2 OA-16: SD/SDSM Screened - B-Side
2005/192 22:52:38-23:06:36 MCL MOD_OA15_SDSM_OPEN.1 OA-15: SD/SDSM Open - B-Side
Maneuvers:
There will be no Lunar calibration in July 2005.
MODIS Anomalies:
At 137/01:07:30, during the 20W portion of the SRCA Full Spatial calibration, there was abnormal output from the lamps. The 20W calibration abruptly ended and neither the 10W calibration nor the 1W calibration were performed, even though the SRCA was still on. All other functions of the SRCA were working properly, including the slit and wheel movements, and the previous 30W calibration. This anomaly seems to be affecting 10W lamps #1, 3, and 4, and 1W lamp #1. From the software point of view, everything appears to have worked correctly, but the current clearly shows the anomaly. Analysis shows that the most likely cause is an overvoltage protection tripping the power to the lamps. This scenario would come about if one of the lamps failed. Since the SRCA was in radiance mode, it would then try and drive the total output of the remaining lamps to equal the radiance that should have been seen if all lamps work working nominally. This situation may cause the other lamps to fail, so the overvoltage protection steps in and shuts down all the lamps, leaving on the non-lamp functions of the SRCA to continue until the activity is complete.
To determine which lamp failed, a series of real-time procedures were executed (see above). First, the SRCA was placed into constant current mode. This allows only a steady current to the lamps, and would not over drive any if another failure happens. Next, 1W lamp #1 was tested to give a baseline for a lamp that was certain to work properly. All current and temperature telemetry was as expected. Then, 10W lamp #1 was tested, followed by 10W lamp #4. Both turned on and telemetry showed the expected currents. When 10W lamp #3 was powered on, telemetry showed that the lamp was selected, however there was no indication in either current or temperature that the lamp had turned on. This is indicative of a failed lamp. Analysis of these activities supports a 10W lamp #3 failure.
MCST has requested that the nominal SRCA calibrations be modified to operate without 10W lamp #3, limiting the SRCA’s characterization support to 20W, 10W, and 1W calibrations. Furthermore, the SRCA spatial and spectral calibrations will be performed in constant current mode, rather than radiance mode.
General Instrument Comments:
FM1 MODIS is in Science Mode. The SVD and NAD are Open, the survival heaters are enabled, and the Black Body is heated to 285 K.
MODIS Telemetry Trends:
The FM1 MODIS instrument telemetry is trending nominally.
Non-MODIS Significant Events:
The EMOS mission status webpage (which includes instrument data loss records) can be found at the following URL. Note that a password is now required to access the EOS mission links webpages. There are directions at the URL below for how to obtain a username/password.
http://jupiter02.gsfc.nasa.gov/links/links.htm
Limited Life Item Status:
SRCA 10W Lamp #1: 245.9 of 500 hours
SRCA 10W Lamp #2: 188.0 of 500 hours
SRCA 10W Lamp #3: 205.7 of 500 hours
SRCA 10W Lamp #4: 82.6 of 500 hours
SRCA 1W Lamp #1: 509.5 of 5000 hours
SRCA 1W Lamp #2: 271.6 of 5000 hours
Solar Diffuser Door: 2396 of 3022 Movements
Nadir Aperture Door: 1053 of 1316 Movements
Space View Door: 632 of 1316 Movements