Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for May 26, 2026

Date/Time Issued: May 14, 2026 1608Z

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

Date/Time of Initial Impact: May 26, 2026 16:41:14z

Date/Time of Expected End: May 26, 2026 17:37:14z

Length of Outage: See Details.

Details/Specifics : On May 26, 2026, 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. 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 is provided below.

The following observatory systems will be affected on May 26, 2026 during the Lunar Roll Activity:

16:41:14z - 17:37:14z CERES will be in Contam-Safe and Standby, science data will not be available

16:56:14z - 17:12:14z HRD will be off, data for direct broadcast users will be unavailable

17:00:43z - 17:07:45z VIIRS encoder offset and gain will be set for Moon observation

17:01:14z - 17:07:14z S-NPP will be pointing off-nadir, collected data may be impacted and not disseminated.   

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