Topic: NOAA 21 VIIRS Lunar Calibration Roll Maneuver Scheduled for November 12, 2024

Date/Time Issued: November 05, 2024 16:11Z

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

Date/Time of Initial Impact: November 12, 2024 04:28:37Z

Date/Time of Expected End: November 12, 2024 04:41:42Z

Length of Outage: See Details.

Details/Specifics of change: On November 12, 2024, NOAA-21 will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -4.678 degrees centered at 04:34:10Z. 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 November 12:

04:29:08Z – 04:41:10Z HRD will be off, data for direct broadcast users will be unavailable
04:28:38Z – 04:41:41Z VIIRS encoder offset and gain will be set for Moon observation
04:29:10Z – 04:41:10Z NOAA-21 will be pointing off-nadir, collected data 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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