Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for May 7, 2025

Date/Time Issued: May 02, 2025 14:36Z

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

Date/Time of Initial Impact: May 7, 2025 23:08:14Z J/Day 127

Date/Time of Expected End: May 8, 2025 00:10:14Z J/Day 128

Length of Outage:  See Details.

Details/Specifics: On May 7, 2025, S-NPP will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -3 degrees centered at 23:33:14Z.
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 May 7th, 2025:
23:08:14Z – 00:10:14Z  CERES will be in Contam-Safe and Standby, science data will not be available
23:23:14Z – 23:45:14Z   HRD will be off, data for direct broadcast users will be unavailable
23:27:44Z – 23:40:45Z   VIIRS encoder offset and gain will be set for Moon observation
23:28:14Z – 23:40:14Z   S-NPP will be pointing off-nadir, collected data may be impacted and not disseminated.

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