S-NPP VIIRS Lunar Calibration Roll Maneuver
4/8/5
6:46
7:42
V
ESPC Operations Notice
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On April 08, 2025, S-NPP will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -1.5 degrees centered at 07:09:58Z.
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 08, 2025 :
06:46:58Z – 07:42:58Z CERES will be in Contam-Safe and Standby, science data will not be available
07:01:58Z – 07:17:58Z HRD will be off, data for direct broadcast users will be unavailable
07:06:28Z – 07:13:27Z VIIRS encoder offset and gain will be set for Moon observation
07:06:58Z – 07:12:58Z S-NPP will be pointing off-nadir, collected data may be impacted and not disseminated.