Topic: S-NPP VIIRS Lunar Calibration Roll Maneuver Scheduled for May 22, 2021
Date/Time Issued: May 21 20:40Z
Product(s) or Data Impacted: All S-NPP Sensor Data
Date/Time of Initial Impact: May 22, 2021 18:17:16Z
Date/Time of Expected End: May 22, 2021 19:13:16Z
Length of Outage: See Details.
Details/Specifics
of change: On May 22, 2021 , S-NPP will perform a spacecraft attitude
maneuver for the VIIRS Lunar Calibration, with a roll of -2.18 degrees
centered at 18:40:16Z. 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 22, 2021 :
18:17:16Z – 19:13:16Z CERES will be in Contam-Safe and Standby, science data will not be available
18:32:16Z – 18:48:16Z HRD will be off, data for direct broadcast users will be unavailable
18:36:46Z – 18:43:47Z VIIRS encoder offset and gain will be set for Moon observation
18:37:16Z
– 18:43:16Z S-NPP will be pointing off-nadir, collected data may be
impacted and not disseminated. ATMS data may be perturbed due to
maneuver-induced spacecraft vibrations