Topic: NOAA 20 VIIRS Lunar Calibration Roll Maneuver Scheduled for January 24, 2021
Date/Time Issued:  January 22, 2021 1410Z
Product(s) or Data Impacted:  All NOAA 20 Sensor Data
Date/Time of Initial Impact:  January 24, 2021 08:52:01Z
Date/Time of Expected End: January 24, 2021 09:54:01Z
Length of Outage:  See Details.
Details/Specifics of change: On January 24, 2021, NOAA-20 will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -2.97 degrees centered at 09:17:01Z. 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 January 24, 2021:
08:52:01Z –  09:54:01Z CERES will be in Contam-Safe and Standby, science data will not be available
09:07:01Z – 09:29:01Z  HRD will be off, data for direct broadcast users will be unavailable
09:11:29Z – 09:24:33Z VIIRS encoder offset and gain will be set for Moon observation
09:12:01Z – 09:24:01Z NOAA-20 will be pointing off-nadir, collected data may be impacted and not disseminated
Contact information for further information: ESPC Operations at or 301-817-3880 24x7 or during normal business hours 
Web Site(s) for applicable information: N/A    
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