S-NPP VIIRS Lunar Calibration scheduled for Dec 7, 2019 - Issued: December 3, 2019 1905Z
Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for December 7, 2019
Date/Time Issued: December 3, 2019 1905Z
Product(s) or Data Impacted: All S-NPP Sensor Data
Date/Time of Initial Impact: December 7, 2019 1928Z
Date/Time of Expected End: December 7, 2019 2030Z
Length of Outage: See Details.
Details/Specifics of change: On December 7, 2019, S-NPP will perform a spacecraft attitude maneuver for the VIIRS Lunar Calibration, with a roll of -6.315 degrees centered at 1953Z. 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 December 7, 2019:
19:28:58 Z – 20:30:58 Z CERES will be in Contam-Safe and Standby, science data will not be available
19:43:58 Z – 20:05:58 Z HRD will be off, data for direct broadcast users will be unavailable
19:48:28 Z – 20:01:29 Z VIIRS encoder offset and gain will be set for Moon observation
19:48:58 Z – 20:00:58 Z S-NPP will be pointing off-nadir, collected data may be impacted and not disseminated