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Mission Operations Days: 2000/239 to 2000/245
August 26, 2000 00:00:00 GMT to September 01, 2000 00:00:00 GMT

Terra Spacecraft and MODIS Instrument Status:

Terra (AM-1) is in Normal Ops Mode
MODIS is in Science Mode - A Side
Component State(s) Comment
Blackbody A On (290 K); B Off Nominal
Calibration Electronics A On; B Off Nominal
Control Processor A On; B Off Nominal
Nadir Door Unlatched, Open Nominal
Space View Door Unlatched, Open Nominal
Solar Diffuser Door Unlatched, Closed Nominal
FDDI Formatter A On; B Off Nominal
FDDI Port A On; B Off Nominal
FIFO Memory #1 & #2 On; #3 & #4 Off Nominal
Format Processor A On; B Off Nominal
Power Supplies #1 On, #2 Off Nominal
PV VIS FPA A On; B Off Nominal
PV NIR FPA A On; B Off Nominal
PV SMIR FPA A On; B Off Nominal
PV LWIR FPA A On; B Off Nominal
PC LWIR FPA A On; B Off Nominal
RC Outgas Heaters All Off (CS, IS, OS) Nominal
RC LWIR FPA Heater On (83 K) Nominal
RC SMIR FPA Heater Off Nominal
Scan Assembly A On; B Off Nominal
SDSM A Off; B Off Nominal
SRCA A Off; B Off Nominal
PS1 Survival Heater Enabled Nominal
PS2 Survival Heater Enabled Nominal
Timing Generator A On; B Off Nominal
Flight Software Rev BD + 1 set of patches
  • FR Error Counting and Statistics (2 patches)
Inhibit Ids Set None Nominal
TMONs Enabled 66, 67, 68 Nominal

This Week’s Completed MODIS Activities:

Saturday, August 26, 2000

2000/239 04:00:00 ATC Set BB Temp to 315
2000/239 04:00:22 ATC Set BB Duty Cycle to FULL
2000/239 05:52:33 Real-Time Set Inhibit ID 31 to prevent CE-B from turning on
2000/239 05:53:14 Real-Time Set Inhibit ID 32 to prevent BB-B from turning on
2000/239 11:00:00 Real-Time Set BB Temp to 270
2000/239 10:59:11 Real-Time Set BB Duty Cycle to THIRD
2000/239 22:33 Real-Time Cleared Inhibit ID 31 to allow future CE ATC events
2000/239 22:34 Real-Time Cleared Inhibit ID 32 to allow future BB ATC events

Sunday, August 27, 2000

2000/240 06:00:00 ATC Turn On CE-A
2000/240 06:00:20 ATC Turn On BB-A
2000/240 06:00:22 ATC Set BB Temp to 290

Monday, August 28, 2000


Tuesday, August 29, 2000


Wednesday, August 30, 2000


Thursday, August 31, 2000

2000/244 20:47:54 ATC OA15 - SDSM Open
2000/244 22:26:47 ATC OA16 - SDSM Screened

Friday, September 1, 2000


This Week's Scheduled MODIS Activities Not Completed:

Saturday, August 26, 2000

2000/239 11:00:00 ATC Set BB Duty Cycle to THIRD (Inhibit ID 32 was set to prevent the next ATC event)
2000/239 11:01:00 ATC Set BB-Temp to 270 (activity scheduled using B-Side CE and BB)

Upcoming MODIS Events:

Saturday, September 2, 2000


Sunday, September 3, 2000


Monday, September 4, 2000


Tuesday, September 5, 2000


Wednesday, September 6, 2000


Thursday, September 7, 2000


Friday, September 8, 2000



The next roll maneuver to view the moon through the space view port is scheduled for September 18th (2000-262, 05:29:56 - 05:16:44 GMT).

MODIS Anomalies:

The formatter anomaly investigation has continued At approximately 8:00pm EDT August 19th, the formatter errors ceased occurring. There are currently 9 unique error addresses recorded by the Formatter, and a total error count of 2183. The A-Side Formatter is operating at approx. - 0.3C.

The LWIR CFPA temperature control has been restored. The temperature is holding within +/- 0.02K of the set-point of 83K. The LWIR CFPA heater voltage is cycling with orbital variations of +/- 0.5V around 6.0V.

MCST is establishing automatic long term trending and critical telemetry point monitoring to track the lasting results of the two recent anomaly resolutions.

General Instrument Comments:

MODIS is in Science Mode on the A-side with the SVD and NAD open, operating with the Formatter Resolution Flight Software Patches.

MODIS Telemetry Trends:

See MODIS Anomalies above.

Non-MODIS Significant Events:


Limited Life Item Status:

SRCA 10W Lamp #1: 173.3 of 500 hours
SRCA 10W Lamp #2: 135.9 of 500 hours
SRCA 10W Lamp #3: 145.1 of 500 hours
SRCA 10W Lamp #4: 61.5 of 500 hours

SRCA 1W Lamp #1: 555.8 of 4000 hours
SRCA 1W Lamp #2: 276.3 of 4000 hours

Solar Diffuser Door: 1399 of 3022 Movements
Nadir Aperture Door: 532 of 1316 Movements
Space View Door: 437 of 1316 Movements