Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for December 30, 2025

Date/Time Issued: December 19, 2025 16:30Z

Product(s) or Data Impacted: All S-NPP Sensor Data

Date/Time of Initial Impact: December 30, 2025 17:03:56Z

Date/Time of Expected End: December 30, 2025 18:05:56Z

Length of Outage: See Details.

Details/Specifics: On December 30, 2025, S-NPP 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:

17:03:56z - 18:05:56z CERES will be in Contam-Safe and Standby, science data will not be available

17:18:56z - 17:40:56z HRD will be off, data for direct broadcast users will be unavailable

17:23:26z - 17:36:27z VIIRS encoder offset and gain will be set for Moon observation

17:23:56z - 17:35:56z S-NPP will be pointing off-nadir, collected data may be impacted and not disseminated

NOTE: S-NPP is the tertiary satellite in the JPSS constellation and has no data latency requirement. Any instrument or data issue arising from this action will be corrected the next business day during normal, 9AM-5PM Eastern business hours.

This notification was sent to ESPC.Notification@noaa.gov mailing list. If you wish to unsubscribe or subscribe to this list, please contact ESPC Help-Desk at ESPCOperations@noaa.gov with your request. Please note: it may take up to two business days to process your request. For any additional information you can reach ESPC at 301-817-3880 (24x7)