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STS-75
Part of STS
STS-75
STS-75
Credit: www.spacefacts.de
Carried TSS-1R tether satellite; satellite tether broke during deployment, making TSS-1R an unintentional free flyer.

AKA: Columbia. Launched: 1996-02-22. Returned: 1996-03-09. Number crew: 7 . Duration: 15.74 days.

Payloads: Tethered Satellite System (TSS) Reflight (1R); Orbital Acceleration Research Experiment (OARE) (part of United States Microgravity Payload 3); USMP-3; Commercial Protein Crystal Growth (CPCG) 09, Block IV; Middeck Glovebox Experiment (MGBX) (part of USMP-3). During the deployment of TSS, the tether broke and the satellite was lost.

Orbits of Earth: 252. Distance traveled: 10,460,735 km. Orbiter Liftoff Mass: 118,610 kg. Payload to Orbit: 10,592 kg. Landed at: Concrete runway 33 at Kennedy Space Center, Florida.

NASA Official Mission Summary:

STS-75
(TSS-1R; USMP-3)
Columbia
Pad B
75th Shuttle mission
19th flight OV-102
Extended mission
29th KSC landing
Crew:
Andrew M. Allen, Mission Commander (3rd Shuttle flight)
Scott J. "Doc" Horowitz, Pilot (1st)
Franklin R. Chang-Diaz, Payload Commander (5)
Jeffrey A. Hoffman, Mission Specialist (5)
Maurizio Cheli, Mission Specialist (1st) (European Space Agency)
Claude Nicollier, Mission Specialist (2nd) (European Space Agency)
Umberto Guidoni, Payload Specialist (1st) (Italian Space Agency)
Orbiter Preps (move to):
OPF - Nov. 5, 1995
VAB - Jan. 23, 1996
Pad - Jan. 29, 1996

Launch:

February 22, 1996, 3:18:00 p.m. EST. Liftoff occurred on-time following smooth countdown. Six seconds after liftoff, crew reported left main engine chamber pressure tape meter was reading only 40 percent thrust instead of 104 percent prior to throttle-down. Mission controllers in Houston reported telemetry showed all three engines were performing nominally and there was no effect on the ascent phase Problem was later traced to a malfunctioning tape meter mechanism.

Landing:

March 9, 1996, 8:58:21 a.m. EST, Runway 33, Kennedy Space Center, Fla. Rollout distance: 8,459 feet (2,578 meters). Rollout time: one minute, four seconds. Mission duration: 15 days, 17 hours, 40 minutes, 21 seconds. Landed revolution 252. Landing opportunities March 8 waved off due to unfavorable weather conditions. First KSC landing opportunity at KSC March 9 waved off, again due to weather.

Mission Highlights:

Re-flight of U.S./Italian Tethered Satellite System (TSS-1R) marred by loss of satellite on flight day three, although valuable scientific data was still gathered. Other primary payload, U.S. Microgravity Payload-3 (USMP-3), performed nominally. TSS considered primary payload at beginning of mission and USMP-3 primary following TSS operations.

TSS flew previously on Mission STS-46 in June 1992, but mission curtailed due to jammed tether. TSS concept designed to study electrodynamics of a tether system in electrically charged portion of Earth's atmosphere called the ionosphere. Satellite provided by Italy and tether/deployer assembly U.S.-built. Twelve investigations - six NASA, five Italian Space Agency (ASI) and one U.S. Air Force - planned. Deployment of TSS-1R on STS-75 delayed one day to allow troubleshooting of onboard TSS computers by flight crew. Excellent scientific data was being gathered when tether snapped on flight day three as satellite was just short of full deployment of 12.8 miles (20.5 kilometers). Satellite immediately began speeding away from orbiter as a result of orbital forces and the crew was never in any danger. Reason for tether break not immediately clear and investigative board convened on ground to determine cause. Crew retracted deployer and remaining tether following day.

Meanwhile, scientists did gather useful data from curtailed deployment. Currents measured during deployment phase were at least three times greater than predicted by analytical modeling, and amount of power generated was directly proportional to the current. Tether voltages of as high as 3,500 volts were developed across the tether, and current levels of about 480 milliamps were achieved. Researchers also able to study how gas from satellite's thrusters interacts with ionosphere. Also collected first-time measurements of ionized shock wave around the TSS satellite, a phenomenon that cannot be studied in the laboratory and is difficult to mathematically model. Another first was collection of data on the plasma wakes created by moving body through electrically charged ionosphere. Some experiments conducted using free-flying satellite and attached tether before it re-entered Earth's atmosphere and broke up.

USMP-3, flying on Shuttle for third time, included U.S. and international experiments, all of which had flown at least once before: Advanced Automated Directional Solidification Furnace (AADSF), a crystal growth facility; Critical Fluid Light Scattering Experiment (Zeno), to study element Xenon at its critical point; Isothermal Dendritic Growth Experiment (IDGE), to study formation of dendrites, tree-shaped crystals that in metals manufacturing dictate final properties of material; Materials for the Study of Interesting Phenomena of Solidification on Earth and in Orbit (MEPHISTO) to study how metals solidify in microgravity using a furnace.

USMP-3 experiments conducted primarily through telescience, where principal investigators could control research from Marshall Space Flight Center's Spacelab Mission Operations Control Center. In MEPHISTO investigation, changes in microgravity environment caused by orbiter thruster firings were correlated with fluid flows in crystal sample. Also able to monitor point at which crystal sample underwent critical change during solidification process. IDGE experiment yielded twice expected amount of data. Best images of dendrites ever transmitted were gathered. This also was first experiment controlled by principal investigator at a remote non- NASA site, foreshadowing types of research which will be conducted on International Space Station, where researchers may be based at universities.

Zeno allowed investigators to observe with unprecedented clarity behavior of Xenon at critical point, when it exists as both gas and liquid.

Space Acceleration Measurement Systems (SAMS) and Orbital Acceleration Research Experiment (OARE), both of which have flown previously, provided data about on-orbit environment. In middeck, crew worked with Middeck Glovebox Facility (MGBX) featuring three combustion experiments, all of which were successful. Glovebox and Forced Flow Flamespreading Test experiment, both slated to fly on Russian Space Station Mir later this year, and glovebox also will fly on International Space Station. Also flying in middeck was Commercial Protein Crystal Growth (CPCG-09) experiment to process nine proteins into crystals to better understand their molecular structure.

More at: STS-75.
Family: Manned spaceflight. People: Allen, Andy, Chang-Diaz, Cheli, Guidoni, Hoffman, Horowitz, Nicollier. Country: USA. Spacecraft: Columbia. Projects: STS. Launch Sites: Cape Canaveral. Agency: NASA, NASA Houston.
1996 February 22 - . 20:18 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC39B. Launch Platform: MLP3. LV Family: Shuttle. Launch Vehicle: Space Shuttle.
1996 March 9 - .
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