Topic: NOAA 20 VIIRS Lunar Calibration Roll Maneuver Scheduled for May 22, 2021

Date/Time Issued: May 21, 2021 2000Z

Product(s) or Data Impacted:  All NOAA 20 Sensor Data

Date/Time of Initial Impact:  May 22, 2021 19:08:52Z

Date/Time of Expected End: May 22, 2021 20:04:52Z

Length of Outage:  See Details.

Details/Specifics of change: On May 22, 2021, NOAA-20 will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -1.72 degrees centered at 19:31:52Z. Science data may be impacted while the spacecraft is pointing off-nadir during the attitude maneuver and the CERES instrument will not provide nominal science data as it will placed in a contamination safe mode.  The timeline of events for this maneuver are provided below.

The following observatory systems will be affected on 2021 May 22:

19:08:52Z – 20:04:52Z CERES will be in Contam-Safe and Standby, science data will not be available
19:28:20Z – 19:35:24Z VIIRS encoder offset and gain will be set for Moon observation
19:28:52Z – 19:34:52Z NOAA-20 will be pointing off-nadir, collected data may be impacted and not disseminated.   ATMS data may be perturbed due to maneuver-induced spacecraft vibrations

Contact Information for Further Information: ESPC Operations at ESPCOperations@noaa.gov or 301-817-3880 

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

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