Mission Operations Days: 2002/236 to 2002/242
August 24, 2002 00:00:00 GMT to August 30, 2002 00:00:00 GMT
Aqua Spacecraft and MODIS Instrument Status:
| PM-1 "Aqua" is in Fine Pointing Normal Mode FM1 MODIS is in Science Mode |
||
|---|---|---|
| Component | State(s) | Comment |
| Blackbody | A Off; B On | 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 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 | 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 | Nominal Science Mode |
| Inhibit Ids Set | None | Nominal Science Mode |
This Week's Completed MODIS Activities:
Saturday, August 24, 2002
None
Sunday, August 25, 2002
None
Monday, August 26, 2002
None
Tuesday, August 27, 2002
None
Wednesday, August 28, 2002
2002/240 13:50:41 MCL OA16: SD/SDSM Screened, SDSM Fixed At Sun - B Side
2002/240 15:29:33 MCL OA15: SD/SDSM Open, SDSM Fixed At SD - B Side
Thursday, August 29, 2002
2002/241 10:00:00 MCL SRCA SETUP activity
2002/241 10:40:47 - 11:21:49 MCL OA19: SRCA Full Spatial
2002/241 15:23:30 - 15:26:01 MCL OA27: PV_ECAL
2002/241 15:26:30 - 15:31:01 MCL OA28: PC_ECAL
2002/241 18:20:00 MCL SRCA SETUP activity
2002/241 18:52:52 - 19:28:39 MCL OA22: SRCA FULL SPECTRAL 1
2002/241 20:32:52 - 21:07:23 MCL OA22: SRCA FULL SPECTRAL 2
2002/241 21:50:00 MCL SRCA SETUP activity
2002/241 22:11:11 - 22:45:44 MCL OA22: SRCA FULL SPECTRAL 3
2002/241 23:48:25 - 242/00:26:26 MCL OA22: SRCA FULL SPECTRAL 4
Friday, August 30, 2002
2002/242 11:00:00 MCL OA26: BB to 270K
This Week's Scheduled MODIS Activities Not Completed:
None
Upcoming MODIS Events:
Saturday, August 31, 2002
243/05:00:00 MCL OA26: BB to 280K
243/09:00:00 MCL OA26: BB to 285K
243/12:00:00 MCL OA26: BB to 290K
243/16:00:00 MCL OA26: BB to 295K
243/16:00:30 MCL OA26: BB Duty cycle to FULL
243/18:00:00 MCL OA26: BB to 300K
243/20:00:00 MCL OA26: BB to 315K
243/23:00:00 MCL OA26: BB to 270K
243/23:00:30 MCL OA26: BB Duty cycle to THIRD
244/19:00:00 MCL OA26: BB to 285K
Wednesday, September 4, 2002
247/15:35:04 MCL OA16: SD/SDSM Screened, B-side
247/17:13:56 MCL OA15: SD/SDSM Open, B-side
Maneuvers:
There will not be a lunar calibration roll maneuver on Aqua in September. The required roll angle would have exceeded the limit of -20 degrees.
The Deep Space Calibration pitch maneuver(s) have been indefinitely suspended pending mission review.
MODIS Anomalies:
On August 28, 2002 (DOY 2002/240), MODIS performed two SDSM calibrations, SCS 154 and SCS 153. However, during SCS 154, the commands to get the CP motor to the HOME position (MOD_GET_CP_MTR_HOME) and to step the SDSM mirror (MOD_STEP_SM_MIR) were dropped. The two commands were in order, but seperated by 45 seconds. There was no command echo for these two commands, nor was there any CP event message. Because of these dropped commands, the SDSM mirror was not in the proper position for the calibration. No MODIS CP event messages were generated and all other commands (including SCS 153 which was performed an orbit later) executed nominally.
On August 13, 2002 (DOY 2002/225) at 11:24:50, the MODIS Formatter data collection rate was supposed to transition from NIGHT mode to DAY mode via SCS 56 in the MODIS MCL. However, it did not transition, leaving MODIS in NIGHT mode until 13:03, when the SCS was called again and did successfully execute. At the same time as the anomaly occurred, the CP LAST EVENT message 2E was received. This occurs when data in the Received Command Queue (RCQ) fails its validation. All data remaining in the RCQ is then discarded. It appears that the command got garbled on its way to MODIS, so that when it was received, MODIS did not understand it, and thus threw it away. This anomaly caused MODIS to stay in NIGHT mode for 1.5 orbits (about 50 minutes longer than normal). DR SMOdr17589 has been submitted to document this incident.
On August 9, 2002 (DOY 2002/221), MODIS performed two SDSM calibrations, SCS 154 (OA16: SD/SDSM Screened, SDSM at Sun - B-Side) and SCS 153 (OA15: SD/SDSM Open, SDSM at SD - B- Side). At the time when SCS 153 was supposed to execute the command to have the MODIS Control Processor execute its Macro 9 (command C009) and close the SDD, the command was dropped. There was no command echo reported by the CP signifying a successful reception of the command, nor a CP event message signifying the reception of invalid command data. The dropped command occurs at the end of SCS 153. The open state of the door was not noticed in the telemetry stream until after the next SDSM calibration on August 14, 2002 (DOY 2002/226). Between those two events (DOY 2002/221 SCS 153 and DOY 2002/226 SCS 154), the SDD remained in the OPEN position. Discrepancy Report (DR) SMOdr17659 has been submitted to document this incident.
An anomaly review is underway to attempt to determine the cause of these two and the previous (DOY 2002/191) command loss incidents. Additionally, the review team is attempting to develop a more thorough mechanism to detect future command losses, and how to protect against any negative effects they may cause.
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 Aqua status can be viewed online at:
http://jupiter02.gsfc.nasa.gov/links/links.htm
Limited Life Item Status:
SRCA 10W Lamp #1: 206.4 of 500 hours
SRCA 10W Lamp #2: 179.5 of 500 hours
SRCA 10W Lamp #3: 182.3 of 500 hours
SRCA 10W Lamp #4: 57.7 of 500 hours
SRCA 1W Lamp #1: 500.4 of 5000 hours
SRCA 1W Lamp #2: 269.8 of 5000 hours
Solar Diffuser Door: 1798 of 3022 Movements
Nadir Aperture Door: 1051 of 1316 Movements
Space View Door: 630 of 1316 Movements