Topic: S-NPP VIIRS Non-Roll Lunar Calibration Scheduled for January 29, 2026

Date/Time Issued: January 22, 2026 1727Z

Product(s) or Data Impacted: S-NPP VIIRS Data

Date/Time of Initial Impact: January 29, 2026 01:08:06Z (029)

Date/Time of Expected End: January 29, 2026 01:13:10Z (029)

Length of Outage: 5 Minutes

Details/Specifics: On January 29, 2026, S-NPP VIIRS will perform a Lunar Calibration without a spacecraft roll maneuver, centered at 01:10:38Z. Only VIIRS science data will be impacted while VIIRS encoder offset and gain are set for Moon observation.

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