Correction:  Details/specifics of change  (made to burn time***) S-NPP will perform a 1.0 second propulsive Drag Makeup Maneuver (DMU).

Topic:  S-NPP DMU Maneuver scheduled for April 29, 2021


Date/Time Issued: April 28, 2021 1716Z


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


Date/Time of Initial Impact: April 29, 2021 1620z


Date/Time of Expected End: April 29, 2021 1827z


Length of Outage:  Approximately 2 hours, 7 minutes.


Details/Specifics of Change: On April 29th, 2021 at 16:46:00z, S-NPP will perform a 1.5 second propulsive Drag Makeup Maneuver (DMU) to maintain Sun Synchronous, Mean Local Time of Ascending Node (MLTAN) at 13:30 ±10 min.


The following observatory systems will be affected on April 29, 2021:


16:20:00Z – 18:27:04Z CERES in Contam-Safe mode, science data will not be available

16:30:00Z – 16:57:06Z OMPS in Decon mode, Science data will not be available

16:35:00Z – 16:58:05Z HRD will be off, data for direct broadcast users will be unavailable.


16:40:00Z – NPP Slew Maneuver to 0 Deg

16:46:00.5Z – 16:46:01Z Maneuver Start/Stop

16:53:04Z – Slew Back to Nadir Attitude

16:40:00Z- 16:57:06z - ATMS data may be perturbed due to maneuver-induced spacecraft vibrations

Contact Information for Further Information: ESPC Operations at at 301-817-3880

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

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