Topic: NOAA 20 VIIRS Lunar Calibration Roll Maneuver Scheduled for June 1, 2020

Date/Time Issued: June 1, 2020 1340Z

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

Date/Time of Initial Impact:  June 1, 2020 23:31:45Z

Date/Time of Expected End: June 2, 2020 00:27:45Z

Length of Outage:  See Details.

Details/Specifics of change: On June 1, 2020, NOAA-20 will perform a spacecraft attitude maneuver for the VIIRS lunar calibration, with a roll of -1.46 degrees centered at 23:54:45Z. 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 be placed in a contamination safe mode.  The timeline of events for this maneuver is provided below.

The following observatory systems will be impacted on 2020 June 1:

23:31:45Z – 00:27:45Z CERES will be in Contam-Safe and Standby, science data will not be available
23:51:13Z – 23:58:17Z VIIRS encoder offset and gain will be set for Moon observation
23:51:45Z – 23:57:45Z NOAA-20 will be pointing off-nadir, collected data may be impacted and not disseminated