MODIS IOT Terra Weekly Report

Mission Operations Days: 2003/172 through 2003/178
June 20, 2003 20:00:00 GMT to June 27, 2003 20:00:00 GMT

Terra Spacecraft and MODIS Instrument Status:

This Week’s Completed MODIS Activities:

None

None

None

None

None

None

None

This Week’s Scheduled MODIS Activities Not Completed:

None

Upcoming MODIS Events:

The only remaining June calibration for the PFM MODIS instrument is the bimonthly PV Electronics calibration. The scheduling of this activity has slipped until July 3rd.

SD/SDSM calibrations are currently on hold pending the resolution of the solar diffuser screen anomaly.

2003/182 15:58:56 - 15:59:19 Real-time FS1_EXEC_INHIB_ID_SET(33) Set inhibit ID for MODIS Control Processor commands
2003/182 15:59:34 - 16:00:00 Real-time FS1_EXEC_INHIB_ID_SET(53) Set inhibit ID for MODIS SDSM commands

SDS Anomaly Recovery

2003/183 12:43:49 - 12:44:31 Real-time MOD_MEM_DUMP(‘motor_constants’,35,0,0,1,2) Memory dump of MODIS table #16
2003/183 12:44:51 - 12:45:36 Real-time MOD_MEM_DUMP(‘motor_trigger_data’,60,0,0,1,2) Memory dump of MODIS table #17
2003/183 12:45:54 - 12:46:26 Real-time MOD_MEM_DUMP(‘motor_pos_when_hit’,12,0,0,1,1) Memory dump of MODIS table #18
2003/183 12:47:13 - 12:47:43 Real-time MOD_MEM_DUMP(‘motor_data’,12,0,0,1,1) Memory dump of MODIS table #20
2003/183 13:12:29 - 13:14:23 Real-time MOD_MEM_DUMP(‘cp_mode’,250,0,0,1,8) Memory dump of MODIS table #11
2003/183 13:14:45 - 13:15:08 Real-time MOD_MEM_LOAD(‘am1_mpr_modis_table11_saf_no_sdd_close’,1,’n’,’disable’,1,1) Memory load to table 11 to not close the MODIS SDD when transitioning to Safe Mode
2003/183 13:16:29 - 13:16:52 Real-time MOD_MEM_LOAD(‘am1_mpr_modis_table11_srv_no_sdd_close’,1,’n’,’disable’,1,1)
Memory load to table 11 to not close the MODIS SDD when transitioning to Survival Mode
2003/183 13:17:08 - 13:19:07 Real-time MOD_MEM_DUMP(‘cp_mode’,250,0,0,1,8) Memory dump of MODIS table #11
2003/183 17:46:28 - 17:48:32 Real-time MOD_MOVE_DOOR(‘sdd’,’screened’,’a’) Move the Solar Diffuser Door to the Screened position
2003/183 17:50:55 - 17:51:26 Real-time MOD_MEM_DUMP(‘motor_pos_when_hit’,12,0,0,1,1) Memory dump of MODIS table #18
2003/183 21:51:16 - 22:00:04 ATC MOD_OA16_SDSM_SCRN_NO_DOOR_A.4 OA16: SD/SDSM screened side A, no door movement
2003/183 19:32:51 Real-time FS1_EXEC_INHIB_ID_RST(53) Clear inhibit ID for MODIS SDSM commands
2003/183 15:58:56 Real-time FS1_EXEC_INHIB_ID_RST(33) Clear inhibit ID for MODIS Control Processor commands
2003/183 21:04:15 Real-time FS1_EXEC_INHIB_ID_SET(34) Set inhibit ID for MODIS SVD and NAD commands
2003/183 21:04:52 Real-time FS1_EXEC_INHIB_ID_SET(58) Set inhibit ID for MODIS door power commands

2003/184 11:14:50 - 11:17:20 ATC MOD_OA27_PV_ECAL PV Band electronics calibration

Maneuvers:

The next MODIS lunar calibration will be on July 18, 2003 (203/199). The roll angle will be -10.3692 degrees, and data collection will be from 03:14:57 - 03:21:27 GMT.

Three Terra inclination maneuvers are currently being planned for July 8th, August 5th, and August 7th, 2003. For each inclination maneuver, a contingency activity will be scheduled in the stored command load to close the MODIS Space View and Nadir doors prior to entering daylight following the maneuver, but the commands will be inhibited after the spacecraft successfully returns to a nominal attitude.

MODIS Anomalies:

During the May 6, 2003 (doy 2003/126) Terra Solar Diffuser calibration with the Solar Diffuser Door in the full open position, the telemetry mnemonic, MOD_CR_DR_SDS_OPEN, did not change from NOT_OPEN to OPEN as was expected. A xx6A CP Event Message, "MTR SDD Trigger Not Found", was generated. Further analysis by MCST determined that the screen had indeed remained NOT_OPEN during this calibration, however, dump data analysis by the IOT showed that the drive motor moved through the entire range of the screen from closed to open to closed. Thermal analysis is underway to determine the cause of this anomaly and Terra SDSM calibrations are temporarily on hold.

General Instrument Comments:

MODIS is in Science Mode, using all A-side components, but cross-strapped to Formatter B, with the blackbody maintained at 290K.

MODIS Telemetry Trends:

Nominal telemetry trending is ongoing.

Non-MODIS Significant Events:

The EMOS mission status webpage (which includes instrument data loss records) can be found at the following URL. Note that a password is now required to access the EOS mission links web pages. There are directions at the URL below for how to obtain a username/password.

http://jupiter02.gsfc.nasa.gov/links/links.htm

Limited Life Item Status:

SRCA 10W Lamp #1: 213.4 of 500 hours
SRCA 10W Lamp #2: 159.5 of 500 hours
SRCA 10W Lamp #3: 168.7 of 500 hours
SRCA 10W Lamp #4: 62.2 of 500 hours

SRCA 1W Lamp #1: 562.0 of 4000 hours
SRCA 1W Lamp #2: 276.7 of 4000 hours

Solar Diffuser Door: 2145 of 3022 Movements
Nadir Aperture Door: 536 of 1316 Movements
Space View Door: 439 of 1316 Movements

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Email the MCST Helpdesk to ask a question about Level 1B usage, algorithms or software.

Last Update: Thursday, 04-Sep-2003 14:24:59 EDT