Topic: NOAA-20 VIIRS Lunar Calibration Roll Maneuver Scheduled for April 27, 2026

Date/Time Issued: April 16, 2026 15:27Z

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

Date/Time of Initial Impact: April 27, 2026 03:58:14z

Date/Time of Expected End: April 27, 2026 05:00:14z

Length of Outage: See Details.

Details/Specifics: On April 27, 2026, 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 April 27, 2026 during the Lunar Roll Activity:

03:58:14z - 05:00:14z   CERES will be in Contam-Safe and Standby, science data will not be available

04:13:14z - 04:35:14z   HRD will be off, data for direct broadcast users will be unavailable

04:17:42z - 04:30:46z   VIIRS encoder offset and gain will be set for Moon observation

04:18:14z - 04:30:14z   NOAA-20 will be pointing off-nadir, collected data may be impacted and not disseminated  

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