S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for December 01, 2025
12/1/25
6:09
7:11
V
ESPC Operations Notice
---
On December 01, 2025, S-NPP will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration. Science data may be impacted while the spacecraft is pointing off-nadir during the attitude
maneuver and the CERES instrument will not provide nominal science data as it will be placed in a contamination safe mode. The timeline of events for this maneuver are provided below.
The following observatory systems will be affected on December 01, 2025 during the Lunar Roll Activity:
06:09:14z - 07:11:14z CERES will be in Contam-Safe and Standby, science data will not be available
06:24:14z - 06:46:14z HRD will be off, data for direct broadcast users will be unavailable
06:28:44z - 06:41:43z VIIRS encoder offset and gain will be set for Moon observation
06:29:14z – 06:41:14z S-NPP will be pointing off-nadir, collected data may be impacted and not disseminated