Topic: S-NPP VIIRS Lunar Roll
Date/Time Issued: May 28, 2015 , 1536 UTC
Product(s) or Data Impacted: All Suomi-NPP Sensor Data
Date/Time of Initial Impact: May 29, 2015 04:24:10 UTC
Date/Time of Expected End: May 29, 2015 05:20:10 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 -2.306 degrees centered at 2015-05-29T04:47:10 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 April 29:
04:24:10 UTC – 05:20:10 UTC CERES will be in Contam-Safe, science data will not be available
04:39:10 UTC – 04:55:10 UTC HRD will be off, data for direct broadcast users will be unavailable
04:43:40 UTC – 04:50:41 UTC VIIRS encoder offset and gain will be set for Moon observation
04:44:10 UTC – 04:50:10 UTC S-NPP will be pointing off-nadir and collected data during that time period may be impacted