Subject: Administrative: Suomi-NPP star tracker Lunar Intrusion
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*Topic:* S-NPP Star Tracker Lunar Intrusion Test scheduled for April
11, 2016
*Date/Time Issued:* April 7, 2016 1430Z
*Product(s) or Data Impacted:* No impact expected
*Date/Time of Initial Impact:* April 11, 2016 18:18:44Z
*Date/Time of Expected End:* April 11, 2016 18:30:02Z
*Length of Outage: * N/A
*Details/Specifics of Change:* On Monday April 11, the S-NPP satellite
will be commanded to ignore Star Tracker inputs from the on-board
Attitude Determination & Control System (ADCS) from 18:18:44 Z to
18:30:02 Z. S-NPP has been experiencing larger than expected attitude
errors when the Moon intrudes the Star Tracker Field-Of-View (FOV),
potentially due to poorly identified stars. Removing the Star Tracker
inputs from the ADCS will prevent inclusion of any poorly identified
stars in the attitude solution, and the ADCS will use Gyro data only
for attitude estimation during this period. No data impacts are
expected and those data should continue to meet specification during
that short test event, however, there is a potential for slightly
degraded attitude that may affect all observations towards the end of
this period.
Contact Information for Further Information: ESPC Operations at
ESPCOperations@noaa.gov at 301-817-3880
Web Site(s) for applicable information: N/A
This message was sent toESPC.Notification@noaa.gov. 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 atESPCOperations@noaa.gov or (301) 817-3880. Please note:
it may take up to two business days to process your unsubscribe
request.
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Topic: S-NPP Star Tracker Lunar Intrusion
Test scheduled for April 11, 2016
Date/Time Issued: April 7, 2016 1430Z
Product(s) or Data Impacted: No impact expected
Date/Time of Initial Impact: April 11, 2016 18:18:44Z
Date/Time of Expected End: April 11, 2016 18:30:02Z
Length of Outage: N/A
Details/Specifics of Change: On Monday April 11, the S-NPP
satellite
will be commanded to ignore Star Tracker inputs from the on-board
Attitude Determination & Control System (ADCS) from 18:18:44 Z to
18:30:02 Z. S-NPP has been experiencing larger than expected attitude
errors when the Moon intrudes the Star Tracker Field-Of-View (FOV),
potentially due to poorly identified stars. Removing the Star Tracker
inputs from the ADCS will prevent inclusion of any poorly identified
stars in the attitude solution, and the ADCS will use Gyro data only
for attitude estimation during this period. No data impacts are
expected and those data should continue to meet specification during
that short test event, however, there is a potential for slightly
degraded attitude that may affect all observations towards the end of
this period.
Contact Information for Further Information: ESPC Operations at
ESPCOperations@noaa.gov
at 301-817-3880
Web Site(s) for applicable information: N/A
This message was sent to ESPC.Notification@noaa.gov.
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 ESPCOperations@noaa.gov or
(301) 817-3880. Please note:
it may take up to two business days to process your unsubscribe
request.
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