Topic:  NOAA-21 VIIRS Lunar Calibration Roll Maneuver Scheduled for December 11, 2024

Date/Time Issued:  December 9, 2024 1933Z

Product(s) or Data Impacted:  All NOAA 21 Sensor Data

Date/Time of Initial Impact: December 11, 2024 11:57:53Z

Date/Time of Expected End: December 11, 2024 12:11:28Z

Length of Event:   See Details.

Details/Specifics:  On December 11, 2024, NOAA-21 will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -10.09 degrees centered at 12:03:56Z. Science data may be impacted while the spacecraft is pointing off-nadir during the attitude maneuver.  The timeline of events for this maneuver are provided below.

The following observatory systems will be affected on 2024 December 11:

11:58:54Z – 12:10:56Z HRD will be off, data for direct broadcast users will be unavailable
11:58:24Z – 12:11:27Z VIIRS encoder offset and gain will be set for Moon observation
11:58:56Z – 12:10:56Z NOAA-21 will be pointing off-nadir, collected data may be impacted and not disseminated.

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