Topic: NOAA-20 VIIRS Lunar Calibration Roll Maneuver Scheduled for November 01, 2025
Date/Time Issued: October 17, 2025 2116z
Product(s) or Data Impacted: All NOAA-20 Sensor Data
Date/Time of Initial Impact: November 01, 2025 19:37:46z
Date/Time of Expected End: November 01, 2025 20:33:46z
Length of Outage: See Details.
Details/Specifics of change: On November 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 November 01, 2025 during the Lunar Roll Activity:
19:37:46z – 20:33:46z CERES will be in Contam-Safe and Standby, science data will not be
available
19:57:14z – 20:04:18z VIIRS encoder offset and gain will be set for Moon observation
19:57:46z – 20:03:46z NOAA-20 will be pointing off-nadir, collected data may be impacted and not disseminated