Topic: NOAA-21 VIIRS Non-Roll Lunar Calibration Scheduled for January 28, 2026
Date/Time Issued: January 22, 2026 1720Z
Product(s) or Data Impacted: NOAA-21 VIIRS Data
Date/Time of Initial Impact: January 28, 2026 22:56:28Z (028)
Date/Time of Expected End: January 28, 2026 23:01:34Z (028)
Length of Outage: 5 MINUTES
Details/Specifics: On January 28, 2026, NOAA-21 VIIRS will perform a Lunar Calibration without a spacecraft roll maneuver, centered at 22:59:01Z. Only VIIRS science data will be impacted while VIIRS encoder offset and gain are set for Moon observation.
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