Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for January 9, 2025

Date/Time Issued: January 08, 2025 1639Z

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

Date/Time of Initial Impact: January 9, 2025 21:18:58Z

Date/Time of Expected End: January 9, 2025 22:20:58Z

Length of Outage: See Details.

Details/Specifics: On January 09, 2025, S-NPP will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -3 degrees centered at 21:43:58Z. 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 January 9th, 2025 :

21:18:58Z – 22:20:58Z CERES will be in Contam-Safe and Standby, science data will not be available

21:33:58Z – 21:55:58Z HRD will be off, data for direct broadcast users will be unavailable

21:38:28Z – 21:51:27Z VIIRS encoder offset and gain will be set for Moon observation

21:38:58Z – 21:50:58Z S-NPP will be pointing off-nadir, collected data may be impacted and not disseminated

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