Topic:  NPP Drag Make-Up Maneuver (DMU) scheduled for June 21, 2023

Date/Time Issued: June 20, 2023 1503Z

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

Date/Time of Initial Impact: June 21,2023 16:43:00

Date/Time of Expected End: June 21,2023 18:50:04

Length of Outage:  See Details.

Details/Specifics of Change: On June 21, 2023 17:09:00Z,

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 June 21, 2023:


 – 18:50:04Z CERES in Contam-Safe mode, science data will not be available


 – 17:20:06Z OMPS in Decon mode, Science data will not be available


 – 17:21:05Z - HRD will be off, data for direct broadcast users will be unavailable


 – 17:11:04Z NPP in Control Frame 2 (DMU) (Delta-V Control Frame)


 – 17:16:04Z 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 at 301-817-3880

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

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