Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for December 18, 2018

Date/Time Issued: December 17, 2018 20:25Z

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

Date/Time of Initial Impact: December 18, 2018 18:22:31Z

Date/Time of Expected End: December 18, 2018 19:24:31Z

Length of Outage: See Details.

Details/Specifics of change: On December 18, 2018, S-NPP will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -7.545 degrees centered at 18:47:31Z. 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 December 18:

18:22:31 Z M-bM-^@M-^S 19:24:31 Z M-BCERES will be in Contam-Safe, science data will not be available

18:37:31 Z M-bM-^@M-^S 18:59:31 Z M-BHRD will be off, data for direct broadcast users will be unavailable

18:42:01 Z M-bM-^@M-^S 18:55:00 Z M-BVIIRS encoder offset and gain will be set for Moon observation
18:42:31 Z M-bM-^@M-^S 18:54:31 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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