Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for January 24, 2021 
Date/Time Issued: January 22, 2021 1410Z
Product(s) or Data Impacted:  All S-NPP Sensor Data
 Date/Time of Initial Impact: January 24, 2021 08:00:49Z
 Date/Time of Expected End: January 24, 2021 09:02:49Z
 Length of Outage:  See Details.
 Details/Specifics of change: January 24, 2021, S-NPP will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -3.29 degrees centered at 08:25:49Z. 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 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 24, 2021:
 08:00:49 Z – 09:02:49 Z  CERES will be in Contam-Safe and Standby, science data will not be available 
08:15:49 Z – 08:37:49 Z  HRD will be off, data for direct broadcast users will be unavailable  
08:20:19 Z – 08:33:20 Z  VIIRS encoder offset and gain will be set for Moon observation
 08:20:49 Z – 08:32:49 Z  S-NPP will be pointing off-nadir, collected data may be impacted and not disseminated

Contact information for further information: ESPC Operations at or 301-817-3880 24x7 or during normal business hours   
Web Site(s) for applicable information: N/A   
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