Topic: S-NPP VIIRS Lunar Roll
Date/Time Issued: February 26, 2015 1940 UTC
Product(s) or Data Impacted: All Suomi-NPP Sensor Data
Date/Time of Initial Impact: March 1, 00:09:22 UTC
Date/Time of Expected End: March 1, 01:11:22 UTC
Length of Outage: See Details.
Details/Specifics of Change: Suomi-NPP will perform a spacecraft attitude maneuver, for the VIIRS Lunar Calibration, with a roll of -4.048 degrees centered at 2015-03-01T00:34:22 UTC. 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 placed in a contamination safe mode. The timeline of events for this maneuver are provided below.
The following observatory systems will be affected on 2015 March 1:
00:09:22 UTC – 01:11:22 UTC CERES will be in Contam-Safe, science data will not be available
00:24:22 UTC – 00:46:22 UTC HRD will be off, data for direct broadcast users will be unavailable
00:28:52 UTC – 00:41:53 UTC VIIRS encoder offset and gain will be set for Moon observation
00:29:22 UTC – 00:41:22 UTC S-NPP will be pointing off-nadir and collected data during that time period may be impacted