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am1weekly_2002-019_2002-025

Mission Operations Days: 2002/019 to 2002/025
January 19, 2002 00:00:00 GMT to January 25, 2002 00:00:00 GMT


NOTICE: A scheduling error occurred. The incorrect calibration activities were conducted. As a result, the Calibration Electronics and Black Body were switched from their A Side, to their B Side. See below for details.


Terra Spacecraft and MODIS Instrument Status:

AM-1 "Terra" is in Normal Mode
PFM MODIS is in A-Side Science Mode
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 Off Nominal
SRCA Off Nominal
PS1 Survival Heater Enabled Nominal
PS2 Survival Heater Enabled Nominal
Timing Generator A On; B Off Nominal
Flight Software Rev BD + 3 set of patches
  • FR Error Counting (2 patches)
  • FR Band 5 Gain Change (20 commands)
  • FR BB Ideal Output Values (1 patch)
Nominal
Inhibit Ids Set None Nominal
TMON 66 Disabled Nominal
TMON 67 Disabled Nominal
TMON 68 Enabled Nominal
TMON 69 Disabled Nominal

This Week's Completed MODIS Activities:

Friday, January 18, 2002

2002/018 21:00:00 ATC OA26: BB Temperature Stepping (BB to 270K) - B Side

Saturday, January 19, 2002

2002/019 15:00:00 ATC OA26: BB Temperature Stepping (BB to 280K) - B Side
2002/019 19:00:00 ATC OA26: BB Temperature Stepping (BB to 285K) - B Side
2002/019 22:00:00 ATC OA26: BB Temperature Stepping (BB to 290K) - B Side

Sunday, January 20, 2002

2002/020 02:00:00 ATC OA26: BB Temperature Stepping (BB to 295K) - B Side
2002/020 02:00:30 ATC OA26: BB Temperature Stepping (BB Duty Cycle to FULL)
2002/020 04:00:00 ATC OA26: BB Temperature Stepping (BB to 300K) - B Side
2002/020 06:00:00 ATC OA26: BB Temperature Stepping (BB to 315K) - B Side
2002/020 09:00:00 ATC OA26: BB Temperature Stepping (BB to 270K) - B Side
2002/020 09:00:30 ATC OA26: BB Temperature Stepping (BB Duty Cycle to THIRD)

Monday, January 21, 2002

2002/021 05:00:00 ATC OA26: BB Temperature Stepping (BB to 290K) - B Side
2002/021 16:25:00 Real-Time MOD_BB_ON('A','A')
2002/021 16:26:00 Real-Time MOD_SET_BB_TEMP(1284) Changed BB back to A side

Tuesday, January 22, 2002

None

Wednesday, January 23, 2002

None

Thursday, January 24, 2002

None

Friday, January 25, 2002

None

This Week's Scheduled MODIS Activities Not Completed:

None

Upcoming Week's MODIS Events:

Friday, January 30, 2002

2002/030 21:01:06 ATC OA15: SDSM OPEN fixed SD
2002/030 21:52:58 22:26:31 ATC OA19: SRCA Full Radiometric, side A
2002/030 22:39:58 ATC OA16: SDSM SCREENED fixed sun

Thursday, January 19, 2002

2002/031 04:28:28 - 05:25:59 OA23: SRCA Full Spatial, side A
2002/031 12:40:12 - 13:31:51 OA22: SRCA Full Spectral, part 1, side A
2002/031 14:35:56 - 15:10:41 OA22: SRCA Full Spectral, part 2, side A
2002/031 15:56:18 - 16:47:34 OA22: SRCA Full Spectral, part 3, side A
2002/031 17:51:57 - 18:29:55 OA22: SRCA Full Spectral, part 4, side A

Friday, January 20, 2002

Spacecraft Roll

Maneuvers:

The next MODIS Lunar Calibration via a spacecraft roll maneuver is scheduled for February 3rd, 2002 (DOY 2002/032) with data collection from 20:19:21 to 20:25:51. The roll angle will be -3.4357 degrees.

The DMU planned to follow the IAM by one week was advanced to Wednesday, January 16, 2002, at 15:39:00 for 14 seconds. DMU Maneuvers are much shorter and less complex than IAMs, as no attitude changes or significant instrument re-configurations are required. Therefore, the maneuver was deemed safe and not susceptible to major impact by the sporadic network events. As a safety precaution, Terra Flight Operations Team (FOT) personnel were stationed in the backup EOC to take over operational responsibility in the event of any problems. There were no network issues during the maneuver.

The IOT has been notified that the Terra Deep Space Calibration Maneuver has been postponed once again. The maneuver is not expected 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 Terra and Aqua spacecraft simultaneously.

MODIS Anomalies:


At the end of last week, an error was made when scheduling the BB. By mistake, the B-side activities were scheduled instead of the A-side. The BB activities ran as scheduled which turns on the B-side calibration electronics, turns on the B-side blackbody heater circuit, sets the BB temperature to a variety of values, and toggles the BB heater duty cylce.

The problem with this is that we had not powered the instrument B-side components since the PS2 shutdown anomaly last June. There was concern as to whether or not any of the B-side loads had been damaged and as a result would further damage other components if powered. Based on the observed telemetry, the B-side BB calibration performed nominally without affecting other components, but we did not wish to take this route until necessary.

We have some additional analysis to perform to gather all of the telemetry from last week's calibrations and will let you know if we identify anything out of the ordinary. We apologize for this error and will do our best to ensure it does not happen again.


Formatter Error Events:

The Formatter Error Count is now approaching 9.8 Million Events.

The Formatter Error Rate has increasing over the past few weeks with the counter rollover time approximately every six hours and fifty minutes.

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

ftp://ftp.mcst.ssai.biz/ftp/pub/permanent/IOT/am1/analysis/FR_events/

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 are being observed.

Non-MODIS Significant Events:

Science Data Loss Reports can be viewed at:

http://jupiter02.gsfc.nasa.gov:591/ssrloss/

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: 1799 of 3022 Movements
Nadir Aperture Door: 534 of 1316 Movements
Space View Door: 437 of 1316 Movements