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Spacecraft and Ground Segments Status

Spacecraft and Ground Segments Status. March 21, 2014. Dan Ossing STEREO Mission Operations Manager (240) 228-8319. STEREO Phase E Organization Chart. Mission Director D. Quinn Mission System Engineer Josephine San. Project Scientist J. Gurman. Project Manager R. A. Denissen.

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Spacecraft and Ground Segments Status

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  1. Spacecraft and Ground Segments Status March 21, 2014 Dan Ossing STEREO Mission Operations Manager (240) 228-8319

  2. STEREO Phase E Organization Chart Mission Director D. Quinn Mission System Engineer Josephine San Project Scientist J. Gurman Project Manager R. A. Denissen Science Teams SSC W. Thompson Payload Operations Teams System Engineering D. Wilson Mission Operations D. Ossing Subsystem Lead Engineers Mission Operation Team DSN Technical GSFC APL FDF DSN Scheduling JPL NRL, UCBerkeley, UNH, UMinn

  3. Program Status • Operations • Began automated unattended tracks April 30,2007 • Operations team is 6 full time staff. Total manpower is approximately 11 MM/M • Downlink rates: Varies, 720 to 120 Kbps depends on antenna size and track elevation • Switched MOC to CCSDS SLE telemetry standard in July 2011 • Began using ESA stations (35 meter) in January 2012 • Due to very high DSN loading • Awaiting new NASA/ESA agreement • Mission operations center still collecting 3 – 5 Gbits per day in support of the science mission. • Special Observatory Events • 36 instrument roll events to observe Comet ISON • 37 High Gain Antenna Calibrations (every 6 months) • 125 Momentum Dumps (~every 6 weeks on both spacecraft) • >127 instrument calibration and roll events

  4. Spacecraft Status • Both observatories operating nominally using reduced gyro operations • IMU status (gyros) • AHEAD • IMU-A – failed in April 2007 • IMU-B – limited remaining life • BEHIND • IMU-A – limited remaining life • IMU-B – failed in January 2014 • Reduced gyro operations uses IMU only when high rate data is required, i.e., momentum dumps, instrument rolls, etc. • Reaction Wheel Stiction • AHEAD – Wheel 1 • BEHIND – Wheels 3 & 4

  5. Ground Segment Status • All MOC peripheral equipment, i.e., PCs, network equipment, UPS batteries, projectors, monitors, printers, and RAID arrays refreshed in 2012. • Refresh of Solaris Unix systems in progress • Switching to Intel based Sun Unix systems

  6. Concerns • Superior Solar Conjunction in 2015 • Untested configuration • MOC Unix system refresh

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