Topic: NOAA-21 VIIRS Non-Roll Lunar Calibration Scheduled for June 24, 2026

Date/Time Issued: June 22, 2026 1502Z

Product(s) or Data Impacted: NOAA-21 VIIRS Data

Date/Time of Initial Impact: June 24, 2026 02:21:27Z

Date/Time of Expected End: June 24, 2026 02:26:33Z

Length of Outage: See Details.

Details/Specifics of change: On June 24, 2026, NOAA-21 VIIRS will perform a Lunar Calibration without a spacecraft roll maneuver, centered at 02:24:00Z. Only VIIRS science data will be impacted while VIIRS encoder offset and gain are set for Moon observation.

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