Mission Operations Days: 2002/138 to 2002/144
May 18, 2002 00:00:00 GMT to May 24, 2002 00:00:00 GMT
Aqua Spacecraft and MODIS Instrument Status:
| PM-1 "Aqua" is in Fine Pointing Standby Mode FM1 MODIS is Outgassing in B-Side Standby Mode |
||
|---|---|---|
| Component | State(s) | Comment |
| Blackbody | A Off; B Off | Standby Mode (with Outgas) |
| Calibration Electronics | A Off; B Off | Standby Mode (with Outgas) |
| Control Processor | A Off; B On | Standby Mode (with Outgas) |
| Nadir Door | Unlatched, Closed | Standby Mode (with Outgas) |
| Space View Door | Unlatched, At Outgas | Standby Mode (with Outgas) |
| Solar Diffuser Door | Unlatched, Closed | Standby Mode (with Outgas) |
| FDDI Formatter | A Off; B Off | Standby Mode (with Outgas) |
| FDDI Port | A Off; B Off | Standby Mode (with Outgas) |
| FIFO Memory | #1 & #2 Off; #3 & #4 Off | Standby Mode (with Outgas) |
| Format Processor | A Off; B Off | Standby Mode (with Outgas) |
| Power Supplies | #1 Off, #2 On | Standby Mode (with Outgas) |
| PV VIS FPA | A Off; B Off | Standby Mode (with Outgas) |
| PV NIR FPA | A Off; B Off | Standby Mode (with Outgas) |
| PV SMIR FPA | A Off; B Off | Standby Mode (with Outgas) |
| PV LWIR FPA | A Off; B Off | Standby Mode (with Outgas) |
| PC LWIR FPA | A Off; B Off | Standby Mode (with Outgas) |
| RC Outgas Heaters | All 3 (CS, IS, OS) On | Standby Mode (with Outgas) |
| RC LWIR FPA Heater | Off | Standby Mode (with Outgas) |
| RC SMIR FPA Heater | Off | Standby Mode (with Outgas) |
| Scan Assembly | A Off; B Off | Standby Mode (with Outgas) |
| SDSM | Off | Standby Mode (with Outgas) |
| SRCA | Off | Standby Mode (with Outgas) |
| PS1 Survival Heaters | Enabled | Standby Mode (with Outgas) |
| PS2 Survival Heaters | Enabled | Standby Mode (with Outgas) |
| Timing Generator | A Off; B Off | Standby Mode (with Outgas) |
| Flight Software | Rev BJ | Standby Mode (with Outgas) |
| Inhibit Ids Set | None | Standby Mode (with Outgas) |
This Week's Completed MODIS Activities:
Saturday, May 18, 2002
None
Sunday, May 19, 2002
None
Monday, May 20, 2002
None
Tuesday, May 21, 2002
None
Wednesday, May 22, 2002
None
Thursday, May 23, 2002
None
Friday, May 24, 2002
2002/144 01:58:17 - 02:00:39 Turned on MODIS: MOD_TURN_ON_PM('PS2', 'CPB')
2002/144 02:18:18 - 02:19:22 Stepped SVD out 750 steps: MOD_STEP_DOOR('SVD', 750, 'OUT')
2002/144 02:19:51 - 02:20:49 Moved SVD to outgas position: MOD_SVD_TO_OG
2002/144 02:21:19 - 02:21:48 Turned on Cold Stage Outgas Heater: MOD_OG_HTR('ON', 'OFF', 'OFF')
2002/144 02:24:21 - 02:24:48 Turned on Intermediate Stage Outgas Heater: MOD_OG_HTR('ON', 'ON', 'OFF')
2002/144 03:07:16 - 03:08:07 Turned on Outer Stage Outgas Heater: MOD_OG_HTR('ON', 'ON', 'ON')
This Week's Scheduled MODIS Activities Not Completed:
None
Upcoming MODIS Events:
The next events in the MODIS activation are:
- Multi-partition CP Table load and dump (to verify Instrument to Spacecraft to Ground capability).
- Moving the SVD from the Outgas to Open position.
- Loading the MODIS SCS loads to the ISC.
- Turning off the MODIS Outgas Heaters.
- Transition MODIS to Science Mode.
The exact dates for the above activities are currently being rescheduled due to schedule shifts from the EPS induced DOY 139 Survival Mode transition.
Maneuvers:
The first Delta-V maneuver was successful but less effective than expected. Planning has begun for the next Delta-V.
Current Ascent Plan (as of May 24, 2002):
- Ascent 1 on May 13, 2002 at 12:14 for 335.000 seconds - Successful
- Burn #2: June 5th, 2002 at 15:13:00, 1168 second duration
- Burn #3: June 8th, 2002 at 13:02:00, 793.5 second duration
- Burn #4: June 10th, 2002 at 12:43:00, 1004 second duration
- Burn #5: June 13th, 2002 at 13:51:00, 694 second duration
- Burn #6: June 18th, 2002 at 16:40:00, 755 second duration
MODIS Anomalies:
MOD_SS_CP_LAST_EVENT
52 (post turn on sequence) CP_EVENT messages have been observed. They have occurred in pairs of (hexadecimal) 5D followed immediately by 77. 5D is the TLM Format/Collect Mismatch message, and 77 is the TLM Late Telemetry Formatting message. SBRS says they have seen these messages during Thermal Vac (around CDH bus activities). The 5D message occurs when something upsets the sector timing or the CP. Since the 5D and 77 are coming together, there may be something going on with the 1553 bus. The events are shortly followed (within 5 seconds) by a telemetry packet with the same MOD_SS_CP1553_MAJCYC value. However, "it appears that the telemetry in said packet is a second reporting of the prior packet, with updates in the one second region. No updates to the data in the 8 and 64 second regions occurred, because the telemetry for that cycle was not sampled (as noted by event 5D)" [Joe Auchter]. An Aqua Discrepancy Report (ADR) has been submitted to document the situation.
So far, there does not appear to be any recognizable pattern or discernable event that is triggering the CP to generate these event messages. Analysis of telemetry continues.
The last event set occurred at 2002/144-11:13:57.
General Instrument Comments:
At 139/16:09:42, MODIS went to survival mode (see below).
At 144/02:00:39, MODIS was powered on to its Standby Mode and subsequent activities placed it in the initial stages of Outgassing.
MODIS is currently On in B-Side Standby Mode (Power Supply 2, Control Processor B) with the Space View Door open to its Outgas Position. All 3 outgas heaters (Cold Stage, Intermediate Stage, and Outer Stage) are powered and duty cycling nominally.
MODIS Telemetry Trends:
The current MODIS telemetry is consistent with what is expected with MODIS in Standby Mode with Outgassing.
Non-MODIS Significant Events:
Saturday, May 18, 2002
137/12:57, A 'time jam' was performed to eliminate the overall GIIS time error. The jam was done and had no impact on the MODIS instrument. The GIIS error was reduced to zero and the time drift is approximately -0.4 ms/day.
138/22:32, AMSR/e spin-up from 21 RPM to 24 RPM
AMSR/e has performed many OBM adjustments in order to eliminate the attitude errors caused by its rotation. As of 138/22:40, there is only a 1 to 3 arc second peak-to-peak pitch error due to its rotation.
Sunday, May 19, 2002
On 2002/139 at 16:09:42, the spacecraft triggered a "911" after it went into sun pointing survival mode. The "911" acquired TDRS early at 4K Engineering telemetry rate. The spacecraft survival mode transition commanded the instruments to their survival modes. The "911" call was initiated by an EPS Fault Management Response to a Spacecraft Battery Depth of Discharge at Eclipse Entry Trigger. The anomaly investigation is still underway (said trigger is currently disabled).
Monday, May 20, 2002
140/17:40, the Aqua spacecraft re-acquired the Earth and transitioned to Earth Point Mode.
140/19:47, the spacecraft transitioned from Survival mode to Safe mode.
Tuesday, May 21, 2002
AQUA spacecraft transitioned to fine pointing mode.
Wednesday, May 22, 2002
142/13:42, AMSR/e spun up from 4 rpm to 29 rpm.
AMSR/e OBM adjustments performed.
Thursday, May 23, 2002
143/14:52, AMSR/e spun up from 29 rpm to 34 rpm.
143/17:20, AMSR/e spun up from 34 rpm to 40 rpm.
AMSR/e OBM adjustments performed.
Friday, May 24, 2002
AMSR/e OBM calibrations complete.
AMSR/e produced its first image.
AMSU-A1 and A2 have both been returned to Full Scan Mode.
The Aqua status can be viewed online at:
http://jupiter02.gsfc.nasa.gov/links/links.htm
Limited Life Item Status:
SRCA 10W Lamp #1: 200.2 of 500 hours
SRCA 10W Lamp #2: 175.7 of 500 hours
SRCA 10W Lamp #3: 178.5 of 500 hours
SRCA 10W Lamp #4: 57.7 of 500 hours
SRCA 1W Lamp #1: 499.5 of 5000 hours
SRCA 1W Lamp #2: 269.8 of 5000 hours
Solar Diffuser Door: 1630 of 3022 Movements
Nadir Aperture Door: 1046 of 1316 Movements
Space View Door: 624 of 1316 Movements