MODIS IOT Terra Weekly Report

Mission Operations Days: 2003/109 through 2003/115
April 18, 2003 20:00:00 GMT to April 25, 2003 20:00:00 GMT

Terra Spacecraft and MODIS Instrument Status:

This Week's Completed MODIS Activities:

None

None

None

2003/112 15:10:32-15:23:43 ATC MOD_OA16_SD_SCREEN_FXD_SUN_A.1 OA-16: SD/SDSM Screened with SDSM Fixed at Sun View - A Side
2003/112 16:10:26-16:43:59 ATC MOD_OA19_SRCA_FULL_RAD_A.3 OA-19: SRCA Full Radiometric - A Side Data Collect Centered on S/C Night (16:18:22-16:52:27)
2003/112 16:49:25-17:02:36 ATC MOD_OA15_SD_OPEN_FIXED_SD_A.1 OA-15: SD/SDSM Screened with SDSM Fixed at SD View - A Side
2003/112 17:52:41-17:55:12 ATC MOD_OA27_PV_ECAL.3 OA-27: PV ECAL Data Collect Centered on S/C Minimum Latitude (17:53:56)

2003/113 16:43:02-17:34:18 ATC MOD_OA22_SRCA_FULL_SPECT_3A.4 OA-22: SRCA Full Spectral Test Part 3 - A Side Data Collect Centered on S/C Night (17:01:30-17:35:36)
2003/113 18:36:58-19:14:56 ATC MOD_OA22_SRCA_FULL_SPECT_4A.3 OA-22: SRCA Full Spectral Test Part 4 - A Side Data Collect Centered on S/C Night (18:40:23-19:14:29)

2003/114 09:00:00 ATC MOD_OA26_BB_270K_A.1 Set blackbody temperature to 270K on the A-side

2003/115 03:00:00 ATC MOD_OA26_BB_280K_A.1 Set blackbody temperature to 280K on the A-side
2003/115 07:00:00 ATC MOD_OA26_BB_285K_A.1 Set blackbody temperature to 285K on the A-side
2003/115 10:00:00 ATC MOD_OA26_BB_290K_A.1 Set blackbody temperature to 290K on the A-side
2003/115 14:00:00 ATC MOD_OA26_BB_315K_A.1 Set blackbody temperature to 315K on the A-side
2003/115 14:00:30 ATC MOD_OA26_BB_DCYCLE_FULL.1 Set blackbody heater duty cycle to FULL
2003/115 17:00:00 ATC MOD_OA26_BB_270K_A.1 Set blackbody temperature to 270K on the A-side
2003/115 17:00:30 ATC MOD_OA26_BB_DCYCLE_THIRD.1 Set blackbody heater duty cycle to THIRD

This Week's Scheduled MODIS Activities Not Completed:

2003/113 13:25:21-14:17:00 ATC MOD_OA22_SRCA_FULL_SPECT_1A.4 OA-22: SRCA Full Spectral Test Part 1 - A Side Data Collect Centered on S/C Night (13:43:45-14:17:50)
2003/113 15:20:49-15:55:34 ATC MOD_OA22_SRCA_FULL_SPECT_2A.4 OA-22: SRCA Full Spectral Test Part 2 - A Side Data Collect Centered on S/C Night (15:22:38-15:56:43)

(See the MODIS Anomalies section below.)

Upcoming MODIS Events:

2003/116 13:00:00 ATC MOD_OA26_BB_290K_A.1 Set blackbody temperature to 290K on the A-side

A rescheduling of the SRCA Spectral activities (all four parts) will soon take place.

May calibrations for the PFM MODIS instrument will include biweekly SDSM, monthly SRCA Radiometric, and bimonthly SRCA Full Spatial calibrations.

Maneuvers:

There will not be a Terra MODIS lunar calibration during the month of May. The required roll angle (-25.2278 degrees) exceeds the maximum allowed angle of -20 degrees.

The next Terra Drag Make-Up (DMU) Maneuver is scheduled for Wednesday, April 30, 2003, at 19:15 GMT (DOY 2003/120). The DMU will be a 20-second burn.

MODIS Anomalies:

On Wednesday, April 23, 2003, the 4 part SRCA Full Spectral calibration was planned. A user error with the scheduling software resulted in the first part of the calibration being scheduled and then subsequently unscheduled. This resulted in only parts 2, 3, and 4 actually being scheduled into the stored command loads. Parts 1 and 3 of the calibration turn on the SRCA before beginning the 30 W and 10 W (respective) portions of the Spectral calibrations. Parts 2 and 4 complete their respective portions of the Spectral calibrations and then turn off the SRCA. Since part 1 was not scheduled, the SRCA was not powered when the command for part 2 was issued. Therefore, part 2 effectively did not execute, and thus no part of the 30 W portion of the Spectral calibration occurred.

At no point was the health of MODIS in danger due to the scheduling error. The entire 4 parts of the calibration will be rescheduled in the near future. More stringent user checking will take place in the future scheduling events to ensure another user error of this sort does not occur again.

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: 210.6 of 500 hours
SRCA 10W Lamp #2: 157.8 of 500 hours
SRCA 10W Lamp #3: 167.0 of 500 hours
SRCA 10W Lamp #4: 62.2 of 500 hours

SRCA 1W Lamp #1: 561.8 of 4000 hours
SRCA 1W Lamp #2: 276.7 of 4000 hours

Solar Diffuser Door: 2139 of 3022 Movements
Nadir Aperture Door: 536 of 1316 Movements
Space View Door: 439 of 1316 Movements

Email the MODIS IOT to report any problem with the MODIS IOT Web Pages.
Email the MCST Webmaster to report any problem with the MCST Web Pages.
Email the MCST Helpdesk to ask a question about Level 1B usage, algorithms or software.

Last Update: Tuesday, 29-Apr-2003 12:57:28 EDT