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am1weekly_2010-177_2010-183

Mission Operations Days: 2010/177 through 2010/183
June 26, 2010 20:00:00 GMT to July 02, 2010 20:00:00 GMT

Terra Spacecraft and MODIS Instrument Status:

AM-1 "Terra" is in Normal Mode
PFM MODIS is in A-Side Nominal Science Mode
(Cross Strapped with FR B)
Component State(s) Comment
Blackbody A On (290K); B Off Nominal Science Mode
Calibration Electronics A On; B Off Nominal Science Mode
Control Processor A On; B Off Nominal Science Mode
Nadir Door Unlatched, Open Nominal Science Mode
Space View Door Unlatched, Open Nominal Science Mode
Solar Diffuser Door Unlatched, Screened Permanent Configuration
FDDI Formatter A On; B Off Nominal Science Mode
FDDI Port A On; B Off Nominal Science Mode
FIFO Memory #1 & #2 On; #3 & #4 Off Nominal Science Mode
Format Processor A Off; B On Nominal Science Mode
Power Supplies #1 On, #2 Off Nominal Science Mode
PV VIS FPA A On; B Off Nominal Science Mode
PV NIR FPA A On; B Off Nominal Science Mode
PV SMIR FPA A On; B Off Nominal Science Mode
PV LWIR FPA A On; B Off Nominal Science Mode
PC LWIR FPA A On; B Off Nominal Science Mode
RC Outgas Heaters All 3 (CS, IS, OS) Off Nominal Science Mode
RC LWIR FPA Heater On (83K) Nominal Science Mode
RC SMIR FPA Heater Off Nominal Science Mode
Scan Assembly A On; B Off Nominal Science Mode
SDSM Off Nominal Science Mode
SRCA Off
  • 10W Lamps - 1, 4 (functional)
  • 10W Lamps - 2, 3 (non-functional)
  • 1W Lamps - 1, 2 (functional)
Nominal Science Mode
PS1 Survival Heater Enabled Nominal Science Mode
PS2 Survival Heater Enabled Nominal Science Mode
Timing Generator A On; B Off Nominal Science Mode
Flight Software Rev BD + 11 sets of patches
  • CP07 to Survival Mode - No SDD to closed command (1 patch)
  • CP07 to Safe Mode - No FR OFF Command (1 patch)
  • CP07 to Safe Mode - No SDD to closed command (1 patch)
  • CP07 to Science Mode - Turn on FRB instead of FRA (1 patch)
  • CP07 to Outgas and Science Mode - Turn on FRB instead of FRA (1 patch)
  • FR Error Counting and Statistics (2 patches)
  • FR 1000ms time code patches (3 patches)
  • FR Band 5 Gain Change (20 commands)
  • FR BB Ideal Output Values (1 patch)
  • FR A EEPROM KME Fast 1 word patch (1 patch)
  • FR B EEPROM KME Fast 1 word patch (1 patch)
Nominal Science Mode
Inhibit Ids Set none Nominal Science Mode
TMON 66 Disabled Nominal Science Mode
TMON 67 Disabled Nominal Science Mode
TMON 68 Enabled Nominal Science Mode
TMON 69 Disabled Nominal Science Mode

This Week's Completed MODIS Activities:

Saturday, June 26, 2010

None

Sunday, June 27, 2010

None

Monday, June 28, 2010

2010/179 09:50:00 ATC MOD_OA03_DAY_RATE.2
OA-03: Formatter to Day Rate (night ground track)
2010/179 10:10:00 ATC MOD_OA04_NIGHT_RATE.1
OA-04: Formatter to Night Rate (return to normal night rate)

Tuesday, June 29, 2010

None

Wednesday, June 30, 2010

None

Thursday, July 01, 2010

None

Friday, July 02, 2010

None

This Week's Scheduled MODIS Activities Not Completed:

Thursday, July 01, 2010

Lunar Roll Maneuver (-9.8291 degrees)
2010/182 08:20:17 ATC MOD_OA03_FR_NIGHT_RATE.1 (03:23 early)
2010/182 08:39:18-08:46:04 ATC MOD_OA08_ROLL_MAN.3
2010/182 09:16:22 ATC MOD_OA03_FR_DAY_RATE.2 (03:23 late)

MODIS Lunar Calibration #98 scheduled for DOY 182, Thursday July 01, 2010 was waived due to an erroneous leap second being commanded to Terra on DOY 181. The anomaly lasted throughout the day until change of day (CoD) on DOY 182 when the Command and Telemetry Interface Unit could be changed. The erroneous second led to a geolocation error of ~7.5 km.

Upcoming MODIS Events:

Calibrations for July will include a Lunar Roll (DOY 182), an SDSM Screened (DOY 194), an SRCA Radiometric (DOY 200) and an SRCA Spatial (DOY 214).

Maneuvers:

None

MODIS Anomalies:

None

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:

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.

Following the Inclination Maneuver on DOY 286 (10/13/09), Terra experienced a Hex Bay Battery (BBAT) cell #50 failure and simultaneously (or close to same time) experienced a Battery Heater Control Electronic anomaly which prevents controlling the temperature for 5 of the 9 heater groups within BBAT. Cell #50 has failed and is non-recoverable. Battery temperatures have stabilized and battery cell temperatures are within an acceptable range. Terra has a robust power system with two 54 cell batteries that feed a power control system that maintains a stable 120V spacecraft power bus even if multiple cells fail. Terra is capable of continuing nominal operations with multiple cell failures. Science data acquisition has remained nominal throughout the anomaly and troubleshooting timeframe. Information will be updated periodically.

On DOY 181 (6/30/10), the FOT erroneously commanded an additional second to the Command and Telemetry Interface Unit (CTIU). Since it was not possible to correct the error on DOY 181, a NAV table with an additional second was uplinked prior to the day rollover, thus configuring the S/C similar to the way leap second changes in Dec 2005 and 2008 were implemented. At the day roll-over, the CTIU added the second to the Spacecraft Computer (SCC) flight software (FSW) and the timing bus. A contact was added to observe the day roll-over in real time and no issues were observed. So, from the S/C perspective, as of 182/0000z, its time is one second behind of the actual time. On DOY 182 (7/01/10), the FOT uplinked a NAV table and commanded the CTIU on the Terra S/C to subtract the extra second that was added the previous day. At the day roll-over, a negative second was applied to the S/C, effectively eliminating the erroneous second. The FOT monitored the day roll-over in real time and no issues were observed.

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

Limited Life Item Status:

SRCA 10W Lamp #1: 293.6 of 500 hours
SRCA 10W Lamp #2: 172.1 of 500 hours
SRCA 10W Lamp #3: 190.3 of 500 hours
SRCA 10W Lamp #4: 98.5 of 500 hours

SRCA 1W Lamp #1: 578.5 of 4000 hours
SRCA 1W Lamp #2: 282.0 of 4000 hours

Solar Diffuser Door: 2146 of 3022 Movements
Nadir Aperture Door: 540 of 1316 Movements
Space View Door: 443 of 1316 Movements