Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for November 01, 2025

Date/Time Issued: October 17, 2025 2117Z

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

Date/Time of Initial Impact: November 01, 2025 19:15:21Z

Date/Time of Expected End: November 01, 2025 20:17:21Z

Length of Outage: See Details.

Details/Specifics of change: On November 01, 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 November 01, 2025 during the Lunar Roll Activity:

19:15:21z – 20:17:21Z  CERES will be in Contam-Safe and Standby, science data will not be available

19:30:21z – 19:52:21Z  HRD will be off, data for direct broadcast users will be unavailable

19:34:51z – 19:47:50Z  VIIRS encoder offset and gain will be set for Moon observation

19:35:21z – 19:47:21Z  S-NPP will be pointing off-nadir, collected data may be impacted and not disseminated.

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