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Mission Operations Days: 2001/356 to 2001/362
December 22, 2001 00:00:00 GMT to December 28, 2001 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
BlackbodyA On (290 K); B OffNominal
Calibration ElectronicsA On; B OffNominal
Control ProcessorA On; B OffNominal
Nadir DoorUnlatched, OpenNominal
Space View DoorUnlatched, OpenNominal
Solar Diffuser DoorUnlatched, ClosedNominal
FDDI FormatterA On; B OffNominal
FDDI PortA On; B OffNominal
FIFO Memory#1 & #2 On; #3 & #4 OffNominal
Format ProcessorA On; B OffNominal
Power Supplies#1 On; #2 OffNominal
PV VIS FPAA On; B OffNominal
PV NIR FPAA On; B OffNominal
PV SMIR FPAA On; B OffNominal
PV LWIR FPAA On; B OffNominal
PC LWIR FPAA On; B OffNominal
RC Outgas HeatersAll Off (CS, IS, OS)Nominal
RC LWIR FPA HeaterOn (83 K)Nominal
RC SMIR FPA HeaterOffNominal
Scan AssemblyA On; B OffNominal
SDSMA Off; B OffNominal
SRCAA Off; B OffNominal
PS1 Survival HeaterEnabledNominal
PS2 Survival HeaterEnabledNominal
Timing GeneratorA Off; B OnNominal
Flight SoftwareRev BD + 3 set of patches
  • FR Error Counting and Statistics (2 patches)
  • FR Band 5 Gain Change (20 commands)
  • FR BB Ideal Output Values (1 patch)
Inhibit Ids SetNoneNominal
TMON 66 (SRCA A)DisabledNominal
TMON 67 (SRCA B)DisabledNominal
TMON 68 (FIFO)EnabledNominal
TMON 69 (EPS Current)DisabledNominal

This Week's Completed MODIS Activities:

Saturday, December 22, 2001


Sunday, December 23, 2001


Monday, December 24, 2001


Tuesday, December 25, 2001


Wednesday, December 26, 2001


Thursday, December 27, 2001


Friday, December 28, 2001


This Week's Scheduled MODIS Activities Not Completed:


Upcoming MODIS Events:

Friday, December 28, 2001


Saturday, December 29, 2001


Sunday, December 30, 2001


Monday, December 31, 2001


Tuesday, January 1, 2002


Wednesday, January 2, 2002


Thursday, January 3, 2002

MODIS Lunar Roll (-1.9741 degrees)
003/??:?? Real-time IRU set to High Rate (lower spacecraft attitude precision)
003/10:46:22 ATC Formatter to Night Rate Set ahead by 03:23 to ensure 50/50 day/night data collection.
003/11:13:14 ATC Formatter to Day Rate
003/11:13:16 ATC SCIABNORM flag set to ABNORM
003/11:13:18 ATC PV DCR computation to OFF
003/11:13:20 ATC PC DCR computation to OFF
003/11:13:22 ATC Sector rotation to 3072
003/11:19:52 ATC Sector rotation to 0
003/11:19:54 ATC PC DCR computation to ON
003/11:19:56 ATC PV DCR computation to ON
003/11:19:58 ATC SCIABNORM flag to NORM
003/11:20:00 ATC Formatter to Night Rate
003/11:42:33 ATC Formatter to Day Rate Set later by 03:23 to ensure 50/50 day/night data collection.
003/??:?? Real-Time IRU set to Low Rate (greater spacecraft attitude precision)

Friday, January 4, 2002



The next MODIS Lunar Calibration via a spacecraft roll maneuver is scheduled for January 3rd, 2001 (2002/003) with data collection from 11:13:22 to 11:19:52. The roll angle will be -1.9741 degrees. See upcoming MODIS events above for command time details.

The IOT has been notified that the Terra Deep Space Calibration Maneuver has been postponed once again. The maneuver is not expected to be performed until late summer of 2002 at the earliest. The reasoning for this delay was to allow the EOS Operations Center (EOC) time to adjust to operating the Terra and Aqua spacecraft simultaneously.

MODIS Anomalies:

Formatter Error Events:

Error tracking spreadsheets have been updated and can be retrieved from:

An MS Excel spreadsheet called, AM1_FR_error_rollovers_MMDDYY.xls contains the data for the times each of the error count “roll over” occurs (with the MMDDYY denoting the date the spreadsheet was made, the more recent date containing the most up-to-date information).

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 (FRFSP).

MODIS Telemetry Trends:

No abnormal telemetry trends have been detected.

Non-MODIS Significant Events:

Science Data Loss Reports can be viewed at:

Select "Search Data Losses" and choose Data Type: MOD

Then press the big SUBMIT button.

Limited Life Item Status:

SRCA 10W Lamp #1: 192.8 of 500 hours
SRCA 10W Lamp #2: 147.2 of 500 hours
SRCA 10W Lamp #3: 156.4 of 500 hours
SRCA 10W Lamp #4: 61.5 of 500 hours

SRCA 1W Lamp #1: 558.6 of 4000 hours
SRCA 1W Lamp #2: 276.3 of 4000 hours

Solar Diffuser Door: 1781 of 3022 Movements
Nadir Aperture Door: 534 of 1316 Movements
Space View Door: 437 of 1316 Movements