Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for April 23, 2021

Date/Time Issued: April 22, 2021 1455Z

Product(s) or Data Impacted: All S-NPP Sensor Data

Date/Time of Initial Impact: April 23, 2021 08:43:03Z

Date/Time of Expected End: April 23, 2021 09:39:03Z

Length of Outage: See Details.

Details/Specifics of change: On April 23, 2021, S-NPP will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -1.27 degrees centered at 09:06:03Z. Science data may be impacted while the spacecraft is pointing off-nadir during the attitude maneuver and the CERES instrument will not provide nominal science data as it will be placed in a contamination safe mode. The timeline of events for this maneuver are provided below.

The following observatory systems will be affected on April 23, 2021:

08:43:03Z – 09:39:03Z CERES will be in Contam-Safe and Standby, science data will not be available
08:58:03Z – 09:14:03Z HRD will be off, data for direct broadcast users will be unavailable
09:02:33Z – 09:09:34Z VIIRS encoder offset and gain will be set for Moon observation
09:03:03Z – 09:09:03Z S-NPP will be pointing off-nadir, collected data may be impacted and not disseminated. ATMS data may be perturbed due to spacecraft vibrations during the maneuver.

Contact Information for Further Information: ESPC Operations at ESPCOperations@noaa.gov or 301-817-3880

Web Site(s) for applicable information: See https://www.ospo.noaa.gov/Operations/messages.html for this and other satellite related messages.

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