Topic:  NPP Drag Make-Up Maneuver (DMU) scheduled for December 20, 2023

Date/Time Issued: December 18, 2023 2120Z

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

Date/Time of Initial Impact: December 20, 2023 17:56:00

Date/Time of Expected End: December 20, 2023 20:03:04

Length of Outage:  See Details.

Details/Specifics of Change: On December 20, 2023 18:22:00Z, S-NPP will perform a 2.0 second propulsive Drag Make-Up Maneuver (DMU) to maintain the Repeating Ground Track box.

The following observatory systems will be affected on December 20, 2023:

17:56:00Z – 20:03:04Z – CERES in Contam-Safe mode, science data will not be available

18:06:00Z – 18:33:06Z – OMPS in Decon mode, Science data will not be available

18:11:00Z – 18:34:05Z – HRD will be off, data for direct broadcast users will be unavailable

18:16:00Z – 18:24:04Z – NPP in Control Frame 2 (DMU) (Delta-V Control Frame)

18:16:00Z – 20:03:04Z – S-NPP pointing off-nadir, collected data during that time period may be impacted and not disseminated

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

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

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