Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for January 27, 2018

Date/Time Issued: January 26, 2018 2102Z

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

Date/Time of Initial Impact: January 27, 2018 19:48:15Z

Date/Time of Expected End: January 27, 2018 20:50:15Z

Length of Outage: See Details.

Details/Specifics of Change: On January 27, 2018, Suomi-NPP will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -4.223 degrees centered at 20:13:15Z. 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 2018 January 27:
19:48:15 Z â€“ 20:50:15 ZÂ CERES will be in Contam-Safe, science data will not be available
20:03:00 Z â€“ 20:25:15 ZÂ HRD will be off, data for direct broadcast users will be unavailable
20:07:45 Z â€“ 20:20:46 ZÂ VIIRS encoder offset and gain will be set for Moon observation
20:08:15 Z â€“ 20:20:15 ZÂ S-NPP will be pointing off-nadir, collected data may be impacted and not disseminated

Contact Information for Further Information: ESPC Operations at ESPCOperations@noaa.gov at 301-817-3880

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

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