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TDRS-7

American communications satellite

Field	Value
name	TDRS-7
image	TDRS-G at KSC.jpg
image_caption	TDRS-G before launch at Kennedy Space Center
mission_type	Communication
operator	NASA
COSPAR_ID	1995-035B
SATCAT	23613
mission_duration	Planned: 10 years
Elapsed:
spacecraft_bus	TDRS
manufacturer	TRW
launch_mass	2108 kg
dimensions	17.3 m long
14.2 m wide
power	1700 watts
launch_date	UTC
launch_rocket
STS-70 / IUS
launch_site	Kennedy Space Center, LC-39B
launch_contractor	Rockwell International
deactivated
orbit_epoch	14 July 1995
orbit_reference	Geocentric orbit
orbit_regime	Geostationary orbit
orbit_longitude	150.0° West (1995–1996)
171.0° West (1996–2003)
150.5° West (2003–)
apsis	gee
programme	Tracking and Data Relay Satellite
First-generation
previous_mission	TDRS-6
next_mission	TDRS-8

Elapsed:

14.2 m wide

STS-70 / IUS

171.0° West (1996–2003) 150.5° West (2003–)

First-generation TDRS-7, known before launch as TDRS-G, is an American communications satellite, of first generation, 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. Whilst similar to its predecessors, it differed from them slightly in that twelve G/H band (C band (IEEE)) transponders which had been included on the previous satellites were omitted. 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 during the STS-70 mission in 1995. Discovery was launched from Kennedy Space Center Launch Complex 39B at 13:41:55 UTC on 13 July 1995. TDRS-G was deployed from Discovery around six hours after launch, and was raised to geosynchronous orbit by means of an Inertial Upper Stage.

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 UTC on 14 July 1995 it reached apogee, and the second stage fired, placing TDRS-G into geostationary orbit. At this point, it received its operational designation, TDRS-7. It was placed at a longitude 150.0° West of the Greenwich Meridian, where it underwent on-orbit testing. In May 1996, it was moved to 171.0° West where it was stored as an in-orbit spare, and subsequently entered service. In December 2003, it was relocated to 150.5° West. It arrived the next month, and was returned to storage as a reserve satellite.

Location of TDRS as of 26 May 2020

References

(1 July 2009). "UCS Satellite Database". Union of Concerned Scientists.
"NASA – NSSDCA – Spacecraft – Trajectory Details".
Krebs, Gunter. "TDRS 1, 2, 3, 4, 5, 6". Gunter's Space Page.
Krebs, Gunter. "TDRS 7". Gunter's Space Page.
McDowell, Jonathan. "Launch Log". Jonathan's Space Page.
McDowell, Jonathan. "Index". Jonathan's Space Page.
(1 December 2002). "The TDRS-J satellite". Spaceflight Now.
"TDRS 7". TSE.

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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