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Mission Operations Days: 2001/118 to 2001/124
April 28, 2001 00:00:00 GMT to May 04, 2001 00:00:00 GMT

BAND 5 GAIN CHANGES were made at 113/13:17:53 – 13:28:08.

The solar diffuser sector size was changed from 50 frames to 5 frames, and the SRCA sector size was changed from 10 frames to 55 frames, from 117/12:11:33 to 117/17:15:13. The SCIABNORM flag was set from 117/12:10:39 to 117/17:22:27.

488,682 CADU’s of MODIS Science Data Lost on OPS DOY 2001/117. See Non-MODIS Significant Events below for details.

Terra Spacecraft and MODIS Instrument Status:

Terra (AM-1) is in Normal Ops Mode
MODIS is in Science Mode - B Side
Component State(s) Comment
Blackbody A Off; B On (290 K) Nominal
Calibration Electronics A Off; B On Nominal
Control Processor A Off; B On Nominal
Nadir Door Unlatched, Open Nominal
Space View Door Unlatched, Open Nominal
Solar Diffuser Door Unlatched, Closed Nominal
FDDI Formatter A Off; B On Nominal
FDDI Port A On; B Off Nominal
FIFO Memory #1 & #2 Off; #3 & #4 On Nominal
Format Processor A Off; B On Nominal
Power Supplies #1 Off; #2 On Nominal
PV VIS FPA A Off; B On Nominal
PV NIR FPA A Off; B On Nominal
PV SMIR FPA A Off; B On Nominal
PV LWIR FPA A Off; B On Nominal
PC LWIR FPA A Off; B On 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 Off; B On 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 Off; B On Nominal
Flight Software Rev BD + 2 set of patches
  • FR Error Counting and Statistics (2 patches)
  • FR Band 5 Gain Change (20 commands)
Inhibit Ids Set None Nominal
TMONs Enabled 68 Nominal

This Week’s Completed MODIS Activities:

Saturday, April 28, 2001


Sunday, April 29, 2001


Monday, April 30, 2001


Tuesday, May 01, 2001


Wednesday, May 02, 2001


Thursday, May 03, 2001

2001/123 16:02:31-16:13:59 ATC OA15: SD/SDSM OPEN
2001/123 17:41:23-17:52:51 ATC OA16: SD/SDSM SCREENED

Friday, May 04, 2001


This Week’s Scheduled MODIS Activities Not Completed:


Upcoming MODIS Events:

Saturday, May 05, 2001


Sunday, May 06, 2001


Monday, May 07, 2001


Tuesday, May 08, 2001

None (Drag Make Up Maneuver, see below)

Wednesday, May 09, 2001


Thursday, May 10, 2001


Friday, May 11, 2001



There will be no MODIS roll maneuver in May because the roll angle would have been too great (more than 20-degree roll required). The next attempt for a roll maneuver will be June.

The next Drag Make Up Maneuver is scheduled for Wednesday, May 8, 2001 (OPS DOY 2001/128). Time of the maneuver will be 20:20:30 with an18 second duration. The expected loss and re-acquisition of pointing accuracy period is 18:50:30-21:50:30.

MODIS Anomalies:


General Instrument Comments:

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

MODIS Telemetry Trends:

Telemetry is trending nominally.

Non-MODIS Significant Events:

488,682 CADU’s of MODIS Science Data Lost on OPS DOY 2001/117. 2 scheduled TDRS contacts were deleted because of space shuttle priorities (01:17 and 01:47). An emergency TDRS contact at 01:45 was unsuccessful (failed lock on both I and Q channels). An attempt to schedule an emergency contact with AGS was unsuccessful (the S/C was not properly configured, and AGS could not guarantee the pass because of a software upgrade). At 117-02:49:48 the MODIS SSR Buffer filled and was disabled. The Buffer was re-enabled at 117-03:05:16 after completion of a playback.

Near 125/00:00 MISR was transitioned (via its internal commanding) to its SAFE mode during one of its activities. More information will be provided once the anomaly is further diagnosed.

Limited Life Item Status:

SRCA 10W Lamp #1: 185.5 of 500 hours
SRCA 10W Lamp #2: 142.4 of 500 hours
SRCA 10W Lamp #3: 151.6 of 500 hours
SRCA 10W Lamp #4: 61.5 of 500 hours

SRCA 1W Lamp #1: 557.3 of 4000 hours
SRCA 1W Lamp #2: 276.3 of 4000 hours

Solar Diffuser Door: 1603 of 3022 Movements
Nadir Aperture Door: 532 of 1316 Movements
Space View Door: 437 of 1316 Movements