Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for May 01, 2023

 Date/Time Issued: April 28, 2023 17:55z

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

Date/Time of Initial Impact: May 01 2023 08:09:18Z

Date/Time of Expected End: May 01, 2023 09:11:18Z

Length of Outage:  See Details.

Details/Specifics of change: 

On May 01, 2023, S-NPP will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -3.13 degrees centered at 08:34:18Z. 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 01, 2023:

08:09:18Z – 09:11:18Z CERES will be in Contam-Safe and Standby, science data will not be available.

08:24:18Z – 08:46:18Z   HRD will be off, data for direct broadcast users will be unavailable.

08:28:48Z – 08:41:47Z   VIIRS encoder offset and gain will be set for Moon observation.

08:29:18Z – 08:41:18Z   S-NPP will be pointing off-nadir, collected data may be impacted and not disseminated.