MODIS IOT Terra Weekly Report

Mission Operations Days: 2004/346 through 2004/352
December 10, 2004 20:00:00 GMT to December 17, 2004 20:00:00 GMT

Terra Spacecraft and MODIS Instrument Status:

This Week’s Completed MODIS Activities:

None

None

None

2004/349 20:55:59-21:04:47 ATC MOD_OA16_SDSM_SCRN_NO_DOOR_A.4 OA-16: SD/SDSM screened side A, no door movement.
2004/349 21:40:00-21:40:31 ATC MOD_SRCA_11_3_8_2_SETUP.1 SRCA setup activity using lamp #4 in lieu of lamp #2
2004/349 21:45:26-22:20:36 ATC MOD_OA19_SRCA_FULL_RAD_A.6 OA-19: SRCA Full Radiometric Calibration.
Data collection from 22:01:20-22:19:37

None

None

None

This Week’s Scheduled MODIS Activities Not Completed:

None

Upcoming MODIS Events:

Calibrations for December will include biweekly SDSM, monthly SRCA Full and 10W Radiometric, and bi- monthly PV ECAL.

2004/353 08:58:08-09:00:39 ATC MOD_OA27_PV_ECAL.3 OA-27: Photovoltaic bands electronics calibration

Maneuvers:

The December Lunar Calibration Roll will be on day 2004/366 (December 31, 2004). Data collect will be from 14:46:25-14:52:55 GMT with a roll angle of –1.3898 degrees.

MODIS Anomalies:

SRCA Lamp #2 failure:

On day 2004/327 (11/22/04), Terra MODIS performed a special SRCA 10W continuous calibration with the filter in the OPEN position. However, it was noticed by MCST that Lamp #2 shut down approximately halfway through it's scheduled on time (55 minutes, 3 seconds of the 109 minute duration). Analysis is still being performed to determine the exact cause of this unexpected shutdown and course of action to be taken.

MODIS NAD (Nadir Aperture Door) Anomaly:

Telemetry still indicates that the “NAD Open” (MOD_CR_DR_NAD_OPEN) trigger is set to the “NOT_OPEN” position; however, science data has shown that the NAD is open. The NAD OPEN trigger may yet “pop” to OPEN due to thermal cycling on the trigger, as was seen on 2002/079.

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 and the Solar Diffuser Door at the Screened position.

MODIS Telemetry Trends:

Nominal telemetry trending is ongoing.

Non-MODIS Significant Events:

Terra Solid State Recorder Anomaly

Overview:

The SSR Anomaly is still under investigation. MODIS currently is operating with 34 Supersets allotted for its buffer. There are plans in the works for possibly power cycling the SSR to get back PWA’s that are in the Bad List, but no date has yet been set. There are no current plans for a change in science data capture rates. For details, see previous report am1weekly_2003-305_2003-311.doc. The Terra FOT is currently evaluating plans to perform a power recycling of the SSR in an attempt to regain functionality of the “bad” PWAs. This activity will be performed at a time when it is least detrimental to critical science data.

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.

Limited Life Item Status:

SRCA 10W Lamp #1: 238.2 of 500 hours
SRCA 10W Lamp #2: 173.3 of 500 hours
SRCA 10W Lamp #3: 182.7 of 500 hours
SRCA 10W Lamp #4: 70.9 of 500 hours

SRCA 1W Lamp #1: 567.3 of 4000 hours
SRCA 1W Lamp #2: 278.7 of 4000 hours

Solar Diffuser Door: 2146 of 3022 Movements
Nadir Aperture Door: 538 of 1316 Movements
Space View Door: 441 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: Friday, 31-Dec-2004 08:53:00 EST