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Tdrs-7

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Title: Tdrs-7  
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Subject: STS-70, Tracking and Data Relay Satellite, Inertial Upper Stage, 1995 in spaceflight, List of TDRS satellites, TDRS-B
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Tdrs-7

TDRS-7, known before launch as TDRS-G, is an American communications satellite which is operated by NASA as part of the Tracking and Data Relay Satellite System. It was constructed by TRW as a replacement for TDRS-B, which had been lost in the Challenger accident, and was the last first-generation TDRS satellite to be launched.

History

TDRS-7 is based on a custom satellite bus which was used for all seven first generation TDRS satellites.[1] Whilst similar to its predecessors, it differed from them slightly in that twelve G/H band (IEEE C band) transponders which had been included on the previous satellites were omitted.[2] It was the last communications satellite, other than amateur radio spacecraft, to be deployed by a Space Shuttle.

Launch

The TDRS-G satellite was deployed from Space Shuttle Discovery during the STS-70 mission in 1995. Discovery was launched from Kennedy Space Center Launch Complex 39B at 13:41:55 GMT on 13 July 1995.[3] TDRS-G was deployed from Discovery around six hours after launch, and was raised to geosynchronous orbit by means of an Inertial Upper Stage.[3]

Deployment

The twin-stage solid-propellent Inertial Upper Stage made two burns. The first stage burn occurred around an hour after deployment from Discovery, and placed the satellite into a geosynchronous transfer orbit. At 02:30 on 14 July it reached apogee, and the second stage fired, placing TDRS-G into geostationary orbit.[4] At this point it received its operational designation, TDRS-7. It was placed at a longitude 150 degrees West of the Greenwich Meridian, where it underwent on-orbit testing.

Semi-retired

In May 1996 it was moved to 171° West where it was stored as an in-orbit spare, and subsequently entered service.[5] In December 2003, it was relocated to 150.5° West.[6] It arrived the next month, and was returned to storage as a reserve satellite.

See also


References

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