Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for November 19, 2018

Date/Time Issued: November 15, 2018 1750Z

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

Date/Time of Initial Impact: November 19, 2018 00:39:26Z

Date/Time of Expected End: November 19, 2018 01:41:26Z

Length of Outage: See Details.

Details/Specifics of change: On November 19, 2018, S-NPP will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -3.177 degrees centered at 01:04:26Z. 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 November 19:

00:39:26 Z M-bM-^@M-^S 01:41:26 Z M-BCERES will be in Contam-Safe, science data will not be available
00:54:26 Z M-bM-^@M-^S 01:16:26 Z M-BHRD will be off, data for direct broadcast users will be unavailable
00:58:56 Z M-bM-^@M-^S 01:11:57 Z M-BVIIRS encoder offset and gain will be set for Moon observation

00:59:26 Z M-bM-^@M-^S 01:11:26 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 and 301-817-3880.

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

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