Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for April 08, 2025

 

Date/Time Issued: April 5, 2025 15:49Z

 

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

 

Date/Time of Initial Impact:  April 08, 2025 06:46:58Z

 

Date/Time of Expected End: April 08, 2025 07:42:58Z

 

Length of Outage:  See Details.

 

Details/Specifics: On April 08, 2025, S-NPP will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -1.5 degrees centered at 07:09:58Z.

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 April 08, 2025 :

06:46:58Z – 07:42:58Z  CERES will be in Contam-Safe and Standby, science data will not be available

07:01:58Z – 07:17:58Z   HRD will be off, data for direct broadcast users will be unavailable

07:06:28Z – 07:13:27Z   VIIRS encoder offset and gain will be set for Moon observation

07:06:58Z – 07:12:58Z   S-NPP will be pointing off-nadir, collected data may be impacted and not disseminated.

 

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