Date/Time Issued: January 15, 2019 1715 Z

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

Date/Time of Initial Impact: January 17, 2019 09:33:32 Z

Date/Time of Expected End: January 17, 2019 10:35:32 Z

Length of Outage: See Details.

Details/Specifics of change: On January 17, 2019, NOAA 20 will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -5.425 degrees centered at 09:58:32Z. 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 2019 January 17:

09:33:32 Z M-bM-^@M-^S 10:35:32 Z M-BCERES will be in Contam-Safe, science data will not be available

09:48:32 Z M-bM-^@M-^S 10:10:32 Z M-BHRD will be off, data for direct broadcast users will be unavailable
09:52:59 Z M-bM-^@M-^S 10:06:05 Z M-BVIIRS encoder offset and gain will be set for Moon observation
09:53:32 Z M-bM-^@M-^S 10:05:32 Z M-BNOAA-20 will be pointing off-nadir, collected data may be impacted and not disseminated


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