Mission Operations Days: 2002/285 to 2002/291
October 12, 2002 00:00:00 GMT to October 18, 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, October 12, 2002
None
Sunday, October 13, 2002
None
Monday, October 14, 2002
2002/287 14:37:09-14:51:07 MCL MOD_OA16_SDSM_SCREEN.2 OA16: SD/SDSM Screened - B-Side
2002/287 16:16:01-16:29:59 MCL MOD_OA15_SDSM_OPEN.1 OA15: SD/SDSM Open - B-Side
Tuesday, October 15, 2002
2002/288 13:22:00 - 13:42:00 Real-time Aqua FOT loads Bus Scheduler Task (BST) Patch This patch switches MODIS real-time and stored command time slots. See the MODIS Anomalies section below.
Wednesday, October 16, 2002
Lunar Roll Maneuver (-20.0510 degree roll)
2002/289 14:23:28 - 14:30:14 MCL MOD_OA08_ROLL_MAN.1 Lunar calibration via roll maneuver (command details listed below)
2002/289 14:23:28 MCL Set formatter to Day rate
2002/289 14:23:30 MCL Set SCIABNORM flag to ABNORM
2002/289 14:23:32 MCL Disable PC DC Restore
2002/289 14:23:34 MCL Disable PV DC Restore
2002/289 14:23:36 MCL Sector Rotation to -3072
2002/289 14:23:36 - 14:30:06 Lunar calibration data collection
2002/289 14:30:06 MCL Sector Rotation to zero
2002/289 14:30:08 MCL Enable PC DC Restore
2002/289 14:30:10 MCL Enable PV DC Restore
2002/289 14:30:12 MCL Set SCIABNORM flag to NORM
2002/289 14:30:14 MCL Set formatter to Night rate
2002/289 14:33:24 - 14:33:43 Real-time FSW_ISC_ACTIVATE_SCS(56) Real time activation of ISC SCS#56 for one orbit's formatter Day/Night commands See the MODIS Anomalies section below.
Thursday, October 17, 2002 Drag Make-up Maneuver
2002/290 14:49 MCL Aqua FOT begins spacecraft yaw slew to +14.35 degrees
2002/290 15:37:03 MCL Aqua FOT commands spacecraft to Attitude Hold Mode
2002/290 15:38 MCL Aqua FOT begins 71 seconds delta-v burn
2002/290 15:40:11 MCL Aqua FOT commands spacecraft to Fine Point Mode
2002/290 16:23 MCL Aqua FOT begins spacecraft yaw return slew to nominal pointing
2002/290 18:58:02 - 19:06:09 DATA LOSS. Due to commanding problems, data could not be downlinked and a portion of the Solid State Recorder was overwritten.
2002/290 21:57:00 - 22:31:00 DATA LOSS. Due to an anomaly commanding a partial SSR playback through the Svalbard ground station, data were lost.
Friday, October 18, 2002
None
This Week's Scheduled MODIS Activities Not Completed:
The commands to adjust the MODIS Day/Night data rate prior to and following the lunar calibration were not scheduled properly and therefore were not sent to MODIS. See the MODIS Anomalies section below.
Upcoming MODIS Events:
Monday, October 21, 2002
2002/294 16:21:20 -- 16:35:18 MCL MOD_OA16_SDSM_SCREEN.2 OA16: SD/SDSM Screened - B-Side
2002/294 17:10:00 -- 17:10:16 MCL MOD_SRCA_SETUP.2 Setup activity for SRCA calibrations
2002/294 17:13:15 -- 17:47:28 MCL MOD_OA19_SRCA_FULL_RAD.1 OA19: SRCA Full Radiometric, B-side
2002/294 18:00:12 -- 16:29:59 MCL MOD_OA15_SDSM_OPEN.1 OA15: SD/SDSM Open - B-Side
Tuesday, October 22, 2002
2002/295 12:55:00 -- 12:55:16 MCL MOD_SRCA_SETUP.2 Setup activity for SRCA calibrations
2002/295 12:57:20 -- 13:49:02 MCL MOD_OA22_SRCA_FULL_SPECT_1.1 OA22: SRCA Full Spectral Part 1, B-side
2002/295 14:52:44 -- 15:27:16 MCL MOD_OA22_SRCA_FULL_SPECT_2.1 OA22: SRCA Full Spectral Part 2, B-side
2002/295 16:13:00 -- 16:13:16 MCL MOD_SRCA_SETUP.2 Setup activity for SRCA calibrations
2002/295 16:15:09 -- 17:06:10 MCL MOD_OA22_SRCA_FULL_SPECT_3.1 OA22: SRCA Full Spectral Part 3, B-side
2002/295 18:08:46 -- 18:46:47 MCL MOD_OA22_SRCA_FULL_SPECT_4.1 OA22: SRCA Full Spectral Part 4, B-side
2002/295 19:42:00 -- 19:44:31 MCL MOD_OA27_PV_ECAL.1 OA27: PV Electronics Calibration
Maneuvers:
The next Aqua MODIS lunar calibration is planned for November 15th, 2002 with data collection from 04:38:56 to 04:45:26 and a roll angle of -9.8076 degrees.
The Deep Space Calibration pitch maneuver(s) have been indefinitely suspended pending mission review.
MODIS Anomalies:
Prior to and following each MODIS lunar calibration, the MODIS formatter rate (Day/Night) is adjusted to account for the six minutes and forty-six seconds of extra day rate data collected during the calibration. The half orbit of day rate data before and after the calibration are usually shortened by three minutes and twenty- three seconds.
Unfortunately, the changes made to this schedule for the maneuver on day 2002/289 scheduled the incorrect activities which only changed the MODIS formatter rate modelling in the ground system and did not schedule any commands to be sent to MODIS onboard the Aqua spacecraft. Therefore, the half orbit of day rate data preceding the lunar calibration were collected with the formatter in night rate. The same error would have caused the half orbit of day rate date following the maneuver to also be collected with the formatter in night rate. A Stored Command Sequence (SCS) onboard Aqua was activated to approximately correct for the missing orbit's MODIS formatter commands. The following is a general outline of the formatter events during this time:
2002/289 12:56:09 - 13:42:13 MODIS data collected at Night rate instead of Day rate
2002/289 ~14:33:30 SCS #56 activated, MODIS formatter set to Day rate
2002/289 14:38:25 MODIS formatter would have nominally been set to Day rate at this time
2002/289 ~15:22:57 SCS #56 sets MODIS formatter to Night rate
2002/289 15:24:29 MODIS formatter would have nominally been set to Night rate at this time
The MODIS commanding anomaly is still being investigated. A patch was loaded to the Aqua spacecraft on Tuesday, October 11th, 2002, to switch the MODIS ground-command timing slots with the MODIS stored- command timing slots. This transfers the risk associated with dropping commands from stored commands to real-time ground commands.
No problems have been reported since the patch was loaded and the last command drop occurred on September 2nd, 2002. The results of the patch will be evaluated for some time before the next configuration change is made. A final patch to the Aqua Bus Scheduler Task (BST) is being considered which would eliminate the timing issues to MODIS for both ground commands and stored commands.
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. The most recent radiative cooler telemetry analysis indicates significant temperature margin for the cold focal planes.
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: 206.9 of 500 hours
SRCA 10W Lamp #2: 179.9 of 500 hours
SRCA 10W Lamp #3: 182.7 of 500 hours
SRCA 10W Lamp #4: 57.7 of 500 hours
SRCA 1W Lamp #1: 500.7 of 5000 hours
SRCA 1W Lamp #2: 269.8 of 5000 hours
Solar Diffuser Door: 1840 of 3022 Movements
Nadir Aperture Door: 1053 of 1316 Movements
Space View Door: 632 of 1316 Movements