The JPSS satellites are scheduled to perform calibration maneuvers on 7 May 2025 which will impact direct broadcast availability. Details for each mission is below.
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Topic: NOAA-21 VIIRS Lunar Calibration Roll Maneuver Scheduled for May 7, 2025
Date/Time Issued: May 5, 2025 1816Z
Product(s) or Data Impacted: All NOAA-21 Sensor Data
Date/Time of Initial Impact: May 7, 2025 21:18:15Z
Date/Time of Expected End: May 7, 2025 21:31:18Z
Length of Outage: See Details.
Details/Specifics of change: On May 7, 2025, NOAA-21 will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -3.89 degrees centered at 21:23:47Z. Science data may be impacted while the spacecraft is pointing off-nadir during the attitude maneuver. The timeline of events for this maneuver are provided below.
The following observatory systems will be affected on 2025 May 7:
21:18:45Z – 21:30:47Z HRD will be off, data for direct broadcast users will be unavailable
21:18:15Z – 21:31:18Z VIIRS encoder offset and gain will be set for Moon observation
21:18:47Z – 21:30:47Z NOAA-21 will be pointing off-nadir, collected data may be impacted and not disseminated
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Topic: NOAA-20 VIIRS Lunar Calibration Roll Maneuver Scheduled for May 7, 2025
Date/Time Issued: May 02, 2025 14:40:00Z
Product(s) or Data Impacted: All NOAA-20 Sensor Data
Date/Time of Initial Impact: May 7, 2025 21:48:57Z J/Day 127
Date/Time of Expected End: May 7, 2025 22:50:57Z J/Day 127
Details/Specifics: On May 7, 2025 , NOAA-20 will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -3 degrees centered at 22:13:57Z. 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 2025 May 7th:
21:48:57Z – 22:50:57Z CERES will be in Contam-Safe and Standby, science data will not be available
22:03:57Z – 22:25:57Z HRD will be off, data for direct broadcast users will be unavailable
22:08:25Z – 22:21:29Z VIIRS encoder offset and gain will be set for Moon observation
22:08:57Z – 22:20:57Z NOAA-20 will be pointing off-nadir, collected data may be impacted and not disseminated
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Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for May 7, 2025
Date/Time Issued: May 02, 2025 14:36Z
Product(s) or Data Impacted: All S-NPP Sensor Data
Date/Time of Initial Impact: May 7, 2025 23:08:14Z J/Day 127
Date/Time of Expected End: May 8, 2025 00:10:14Z J/Day 128
Details/Specifics: On May 7, 2025, S-NPP will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -3 degrees centered at 23:33:14Z. 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 May 7th, 2025:
23:08:14Z – 00:10:14Z CERES will be in Contam-Safe and Standby, science data will not be available
23:23:14Z – 23:45:14Z HRD will be off, data for direct broadcast users will be unavailable
23:27:44Z – 23:40:45Z VIIRS encoder offset and gain will be set for Moon observation
23:28:14Z – 23:40:14Z S-NPP will be pointing off-nadir, collected data may be impacted and not disseminated.