Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for May 14, 2019

Date/Time Issued: May 13, 2019 1610Z

Product(s) or Data Impacted: All S-NPP Sensor Data

Date/Time of Initial Impact: May 14, 2019 20:51:25Z

Date/Time of Expected End: May 14, 2019 21:53:25Z

Length of Outage: See Details.

Details/Specifics of change: On May 14, 2019, S-NPP will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -3.1 degrees centered at 21:16:25Z. 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 are provided below.

The following observatory systems will be affected on May 14, 2019:

20:51:25 Z M-bM-^@M-^S 21:53:25 Z M-BCERES will be in Contam-Safe and Standby, science data will not be available

21:06:25 Z M-bM-^@M-^S 21:28:25 Z M-BHRD will be off, data for direct broadcast users will be unavailable

21:10:55 Z M-bM-^@M-^S 21:23:56 Z M-BVIIRS encoder offset and gain will be set for Moon observation
21:11:25 Z M-bM-^@M-^S 21:23:25 Z M-BS-NPP 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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