MODIS IOT Aqua Weekly Report

Mission Operations Days: 2002/124 to 2002/130
May 4, 2002 00:00:00 GMT to May 11, 2002 00:00:00 GMT

• Aqua launched on-time at 09:54:58 GMT May 4th, 2002 (2002/124)!!
• The FM1 MODIS survival heaters were enabled at 14:18 GMT on May 4th, 2002 (2002/124).
• The FM1 MODIS was turned on (PS2/CPB) at 01:54 GMT on May 7th, 2002 (2002/127).
• The FM1 MODIS SVD was unlatched at 03:13 GMT on May 7th, 2002 (2002/127).
• The FM1 MODIS SDD was unlatched at 04:51 GMT on May 7th, 2002 (2002/127).
• The FM1 MODIS NAD was unlatched at 06:29 GMT on May 7th, 2002 (2002/127).

Aqua Spacecraft and MODIS Instrument Status:

This Week's Completed MODIS Activities:

2002/124 09:54:58 - EOS PM-1 "Aqua" launched from Vandenberg Air Force Base

2002/124 14:18:14-14:18:51 Real-time Survival Heaters Enabled, MOD_SRV_HTR_ENA

None

None

2002/127 01:54:14 - 01:59:34 Real-time Turn on MODIS with PS2 and CPB, MOD_TURN_ON_PM('PS2','CPB')
2002/127 03:13:27 - 03:19:36 Real-time Unlatch Space View Door, MOD_SVD_UNL('B')
2002/127 04:51:08 - 04:57:52 Real-time Unlatch Solar Diffuser Door, MOD_SDD_UNL('B')
2002/127 06:29:02 - 06:35:44 Real-time Unlatch Nadir Door, MOD_NAD_UNL('B')
2002/127 21:24:00 Real-time Disabled Blackbody temperature alarms, MOD_BBODY_ALARMS(0)

None

None

2002/130 14:28 - 15:56 Demonstration Zero Burn Delta-V maneuvers (yaw with no thruster firing)

This Week's Scheduled MODIS Activities Not Completed:

Upcoming MODIS Events:

The next MODIS events will be to step the Space View Door (SVD) out by 750 counts, move the SVD to the outgas position, and enable the outgas heaters (individually). These activities are scheduled to occur on mission elapsed day thirteen (Friday, May 17th, 2002).

Maneuvers:

The demonstration Zero Burn Delta-V maneuvers (yaw with no thruster firing) was successfully performed at roughly 14:28 to 15:56 on 2002/130. The 30 second demonstration Delta-V burn will occur on 2002/131 between 16:35 to 18:12. The 399 second 'real' Delta-V burn is schedule for Monday (2002/133) morning pending the outcome of the 30 second burn.

MODIS Anomalies:

MOD_SS_CP_LAST_EVENT

24 (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 both valid and the correct telemetry for the expected packet (in other words, only the Major Cycle counter is incorrect). 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 2002/130-18:13:24.

General Instrument Comments:

MODIS is in a low-power Standby Mode using Power Supply 2 (PS2) and Control Processor B (CPB). The instrument survival heaters are enabled and all three doors are unlatched.

MODIS Telemetry Trends:

Some of the MODIS ISC Passive Analog Temperatures (SAM Radiator and OB Bulkhead) cooled off faster than predicted (based on TV, Terra, and Simulation data). The temperatures leveled out and demonstrated orbital and survival heater cycling at their expected temperatures. The Optical Bench Bulkhead temperature reached temperatures as low as -28.25 C.

Once the Space Craft transitioned to EPM, the passive temperatures on MODIS increased to a range between -8 and -17 C. The OB Bulkhead temperature rose to -14.1 C.

The instrument survival heaters are cycling as expected. The Format Engine A & B side temperatures are also varying with the survival heater cycle and are dropping below their designated yellow alarm limits at their coldest temperatures. It currently takes about six hours to complete one cycle of the format engine temperatures.

The blackbody temperatures are 'pegged' low as expected. These temperatures will remain below the yellow limits until after MODIS transitions to Science Mode so the alarms have been disabled until that time.

There are a few project database issues regarding MODIS telemetry points. This is a result of having duplicate EPOCH (for I & T) and EMOS (for operations) sets of telemetry limits for mnemonics that needed derived parameters to account for the different CPA and CPB calibration coefficients. The offending alarms have been disabled and corrections will be made in the first post-launch database update (currently scheduled for Launch +60 days).

Non-MODIS Significant Events:

• Launch
• Deploy Solar Array
• AMSR-E Power On
• GNC to Sun Point Mode with Thermal Roll
• SCE-3 Instrument Survival Heater Power On
• AMSR-E Reflector Deployment Ops
• MODIS Survival Heater Power On
• AMSR-E Sensor Unit Deployment
• AMSR-E Initial Run-Up to 4 RPM
• CERES +Y Aft Instrument Deployment
• CERES -Y Fore Instrument Deployment
• X-Band Antenna Deployment

• Earth Acquisition
• First S-Band EPGN Contact
• SSR S-Band Playback
• Spacecraft State Switched to Standby State

• Ultra-Stable Oscillators (USO) 1-3 were turned on at 10:15, 11:03 and11:23 respectfully. USOs 1,2 & 3 became operational at 12:45.
• Transponder Interface Electronics (TIE) Clock Jam and Adjustment was completed at 12:55. GIRD clock error was only 0.1 msec and the GIIS clock error was only 0.45 msec. The science requirement is +/- 10 msec.
• AIRS was commanded to Standby/Startup at 13:33.
• AIRS was commanded to Standby/Instrument Initialized.
• The first Master Command Load (MCL) was loaded at 18:58 and activated at 00:00.
• Star Tracker Assemblies (STA) were turned on at 23:21 to evaluate performance.
• AIRS decontaminate heater was commanded on at 23:47.

• CERES Fore was powered On at 02:34.
• CERES Aft was powered On at 03:19.
• The Flight Software patch to aid in CLCW error troubleshooting was loaded and activated at 17:52.
• Transitioned AIRS to Standby with the Cooler Off at 19:55.

• Successfully transitioned from Earth Point Mode to Fine Point Mode (FPM) at 18:36. The spacecraft is currently maintaining FPM within the Aqua science tolerances.

• Zero second Delta-V demonstration yaw and burn was performed between 14:28 and 15:56.
• Aqua performed its first X-Band Direct Broadcast Play Back at 21:25.

• Aqua's SSR was reconfigured for the partition formats to store science data at 02:04.

Limited Life Item Status:

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Last Update: Tuesday, 03-Dec-2002 13:08:56 EST