Topic: Suomi-NPP SCC Table 34 with Gyro axes alignments scheduled for load on December 11, 2018

Date/Time Issued: December 10, 2018 2104Z

Product(s) or Data Impacted: No significant impacts expected

Date/Time of Initial Impact: December 11, 2018 1615Z

Date/Time of Expected End: December 17, 2018 2000Z

Length of Outage: See details below

Detail/Specifics of Change: On December 11, 2018 during SVL 36906, AOS 16:13:34Z - LOS 16:25:54Z, SCC Table 34 containing updated Gyro axes alignment matrix and associated scale factors will be loaded to the SNPP Spacecraft Control Computer (SCC) in order to characterize Gyro axis alignment impacts on star tracker performance during Lunar intrusions of the star tracker FOV from December 12 through December 14. This updated table will be flown on-board until the current SCC Table 34 is restored on Monday Dec 17. No significant impact to spacecraft operations or data is expected, however, there may be minor attitude perturbations for several minutes after the new tables are loaded on December 11, and when the original Table 34 is restored on December 17.

Contact Information for Further Information: ESPC Operations at and 301-817-3880

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