Update on Terra Constellation Exit Maneuvers

Nov 07, 2022

The Terra flight operations team successfully conducted Constellation Exit Maneuvers (CEMs) to lower the Terra satellite to an altitude of 694 km by performing retrograde maneuvers on October 12 and 19, 2022.

Following the CEMs, the space and nadir view doors for Terra MODIS were opened on October 21, and the formatter resumed nominal day/night mode operations from October 22. All instrument temperatures had attained their nominal values by October 23. Assessments carried out by the MODIS validation team now indicate nominal performance and no major cause for concerns, barring slight gain changes that have been noticed for some of the Short-Wave Infrared (SWIR) bands (mainly for Band 5), and a possible slight change in cross-talk behaviors for some of the photovoltaic (PV) long-wave infrared (LWIR) detectors. The gain changes in the SWIR bands should have been addressed by the updated L1B Look Up Tables (LUTs) that were used to resume production. MODIS Terra forward processing was successfully resumed from day 296 (October 23) 22:35 UTC, using the updated L1B LUTs that were delivered by the MODIS Calibration team.

An update is expected from the ASTER validation team in the near future.

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