Topic: NOAA-21 VIIRS Lunar Calibration Roll Maneuver Scheduled for November 01, 2025
Date/Time Issued: October 17, 2025 2122Z
Product(s) or Data Impacted: All NOAA-21 Sensor Data
Date/Time of Initial Impact: November 01, 2025 19:04:27z
Date/Time of Expected End: November 01, 2025 19:18:02z
Length of Outage: See Details.
Details/Specifics of change: On November 01, 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 November 01, 2025 during the Lunar Roll Activity :
19:05:28z – 19:17:30z HRD will be off, data for direct broadcast users will be unavailable
19:04:58z – 19:18:01z VIIRS encoder offset and gain will be set for Moon observation
19:05:30z – 19:17:30z NOAA-21 will be pointing off-nadir, collected data may be impacted and not dissemination