Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for February 5, 2020

Date/Time Issued: February 4, 2020 1813Z

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

Date/Time of Initial Impac
t: February 5, 2020 0841Z

Date/Time of Expected End: February 5, 2020 0937Z

Length of Outage:M-B See Details.

Details/Specifics of change: February 5, 2020, S-NPP will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -1.57 degrees centered at 09:04:17Z. 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 February 5, 2020:

08:41:17 Z M-bM-^@M-^S 09:37:17 ZM-B CERES will be in
Contam-Safe and Standby, science data will not be available

08:56:17 Z M-bM-^@M-^S 09:12:17 ZM-B HRD will be off, data for direct broadcast users will be unavailable

09:00:47 Z M-bM-^@M-^S 09:07:48 ZM-B VIIRS encoder offset and gain will be set for Moon observation
09:01:17 Z M-bM-^@M-^S 09:07:17 ZM-B S-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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