Topic: NOAA-20 VIIRS Lunar Calibration Roll Maneuver Scheduled for December 30, 2025

Date/Time Issued: December 19, 2025 16:33Z

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

Date/Time of Initial Impact: December 30, 2025 15:43:56Z

Date/Time of Expected End: December 30, 2025 16:45:56Z

Length of Outage: See Details.

Details/Specifics: On December 30, 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 30, 2025 during the Lunar Roll Activity:

15:43:56z - 16:45:56z CERES will be in Contam-Safe and Standby, science data will not be available

15:58:56z - 16:20:56z HRD will be off, data for direct broadcast users will be unavailable

16:03:24z - 16:16:28z VIIRS encoder offset and gain will be set for Moon observation

16:03:56z - 16:15:56z NOAA-20 will be pointing off-nadir, collected data may be impacted and not disseminated

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