Topic: NOAA 20 VIIRS Lunar Calibration Roll Maneuver Scheduled for April 25, 2018

Date/Time Issued: April 23 2018 2102Z

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

Date/Time of Initial Impact: April 25, 2018 19:56:06Z

Date/Time of Expected End: April 25, 2018 20:58:06Z

Length of Outage: See Details.

Details/Specifics of change: On April 25, 2018, NOAA 20 will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -2.54 degrees centered at 20:21:06Z. 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 2018 April 25:

19:56:06 Z M-bM-^@M-^S 20:58:06 Z M-BCERES will be in Contam-Safe, science data will not be available
20:15:34 Z M-bM-^@M-^S 20:28:38 Z M-BVIIRS encoder offset and gain will be set for Moon observation
20:16:06 Z M-bM-^@M-^S 20:28:06 Z M-BNOAA-20 will be pointing off-nadir, collected data may be impacted and not disseminated

Contact Information for Further Information: ESPC Operations at at 301-817-3880

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

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