S-NPP Drag Make-Up maneuver 29 April 2021

S-NPP Drag Make-Up maneuver 29 April 2021

Postby kathys » Wed Apr 28, 2021 11:43 am

S-NPP DMU Maneuver scheduled for April 29, 2021

Date/Time Issued: April 28, 2021 1635z

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
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