Topic: Suomi-NPP SCC Table 34 with Gyro axes alignments scheduled for load on February 8, 2019

Date/Time Issued: February 7, 2019 21:44Z

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

Date/Time of Initial Impact: February 8, 2019 16:07Z

Date/Time of Expected End: February 12, 2019 22:00Z

Length of Outage: See details below

Detail/Specifics of Change:
On February 8, 2019 during SVL 37743, AOS 16:07Z - LOS 16:19Z, 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 Field-Of-View (FOV) from Februry 9 through February 11. This updated table will be flown on-board until the current SCC Table 34 is restored on Tuesday February 12. 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 February 8, and when the original Table 34 is restored on February 12. Backup opportunity for the load on February 8 is SVL 37744 with AOS at 17:50Z - 18:01Z.

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

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

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