NOAA-17, Switch to YGC Mode, 30 May 2003 - Issued: 29 May 2003; 2045 UTC

4:46 PM
Subject: NOAA-17, Switch to YGC Mode, 30 May 2003 - Issued: 29 May 2003; 2045 UTC

Switch to YGC mode for weekend

Date/Time(UTC) Message Issued:
29 May 2003, 2045 UTC

Satellite(s) Involved:

Instrument(s) Involved:

Product(s) Involved/Affected:
All products

Date/Time(UTC) of Initial Implementation:
30 May 2003, Time 1435 UTC

Details/Specifics of Change:
The Satellite Operations Control Center (SOCC) issued the following notice:

On 30 May 2003, around 1435 UTC, the NOAA-17 spacecraft will be commanded to
operate in Yaw Gyro Compassing (YGC) attitude control mode instead of normal
attitude control mode. This will last through the weekend and after which
it will be commanded back to normal attitude mode on 2 June 2003 around 1506
UTC. This is being done to prevent a forced, autonomous switch to YGC mode
that has a possibility of occurring when the spacecraft attempts to do a Yaw
update while in the darkness of a solar eclipse.

Users may see a slight change in the accuracy of geolocations while
operating in YGC mode.

Contact Person(s) Name/Email/Phone Number for Questions: ext. 117 ext. 124

Web site(s) that contain other relevant information (where applicable): - History of level 1B
notices - All user notices - SOCC polar satellites status - SOCC morning reports