Topic: NPP VIIRS Lunar Calibration on January 13, 2022

Date/Time Issued: January 12, 2022 1628Z

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

Date/Time of Initial Impact: January 13, 2022 0401Z

Date/Time of Expected End: January 13, 2022 0503Z

Length of Outage: Approximately 1 hour, 2 minutes.

Details/Specifics of change: On January 13, 2022, S-NPP will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -5.21 degrees centered at 04:26:00Z. 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 13, 2022:

04:01:00Z – 05:03:00Z CERES will be in Contam-Safe and Standby, science data will not be available

04:16:00Z – 04:38:00Z HRD will be off, data for direct broadcast users will be unavailable

04:20:30Z – 04:33:31Z VIIRS encoder offset and gain will be set for Moon observation
04:21:00Z – 04:33:00Z S-NPP will be pointing off-nadir, collected data may be impacted and not disseminated

Contact Information for Further Information: ESPC Operations at ESPCOperations@noaa.gov and 301-817-3880.

Web Site(s) for applicable information: N/A

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