Hydrazine Operations at Near-Freezing Temperatures During the Ulysses Extended Mission

Details Hydrazine Operations at Near-Freezing Temperatures During the Ulysses Extended Mission Hydrazine Operations at Near-Freezing Temperatures During the Ulysses Extended Mission

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.555e...6m&link_type=abstract

Proceedings of the 4th International Spacecraft Propulsion Conference (ESA SP-555). 2-9 June, 2004, Chia Laguna (Cagliari), Sard

Physics

Scientific paper

The Ulysses mission was recently extended for the third time to March 2008. This extension will require Ulysses to operate far beyond its intended design lifetime at very low power and thermal margins. As a result, it will enter the coldest part of its orbit, as it returns from aphelion at Jupiter distance, with parts of the Reaction Control System (RCS) pipework containing the hydrazine propellant already at near-freezing temperatures. With limited telemetry, no simulator and only a thermal model optimized for the prime mission case, the operations team faces many challenges to avoid freezing of propellant in the RCS, and the hazardous consequences which would result. This paper gives an overview and operational history of the Ulysses monopropellant pressurized hydrazine RCS, describes techniques for detecting possible indications of hydrazine freezing, and potential contingency strategies should partial freezing occur.

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