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

Contact Information for Further Information: ESPC Operations at or 301-817-3880 

Web Site(s) for applicable information: N/A

This message was sent by You have been sent this and other notifications because you have opted in to receive it. If for any reason, you wish to unsubscribe, please contact ESPC Help Desk at or (301) 817-3880. Please note: it may take up to two business days to process your unsubscribe request.