Topic: NOAA-20 VIIRS Lunar Calibration Roll Maneuver Scheduled for December 01, 2025

Date/Time Issued: November 20, 2025 2014Z

Product(s) or Data Impacted: All NOAA-20 Sensor Data

Date/Time of Initial Impact:   December 01, 2025 06:31:06Z

Date/Time of Expected End:   December 01, 2025 07:33:06Z

Length of Outage: See Details.

Details/Specifics: On December 01, 2025, NOAA-20 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:
06:31:06z - 07:33:06z   CERES will be in Contam-Safe and Standby, science data will not be available

06:46:06z - 07:08:06z   HRD will be off, data for direct broadcast users will be unavailable

06:50:34z - 07:03:38z   VIIRS encoder offset and gain will be set for Moon observation

06:51:06Z - 07:03:06z   NOAA-20 will be pointing off-nadir, collected data may be impacted and not disseminated

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