Date/Time Issued: December 19, 2025 1633Z
Product(s) or Data Impacted: All NOAA-21 Sensor Data
Date/Time of Initial Impact: December 30, 2025 1653Z
Date/Time of Expected End: December 30, 2025 1707Z
Length of Outage: See Details.
Details/Specifics: On December 30, 2025, NOAA-21 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. 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:
16:54:38z - 17:06:40z HRD will be off, data for direct broadcast users will be unavailable
16:54:08z - 17:07:11z VIIRS encoder offset and gain will be set for Moon observation
16:54:40z - 17:06:40z NOAA-21 will be pointing off-nadir, collected data may be impacted and not disseminated
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