Next Spaceflight

Status

Success

Space Shuttle Discovery | STS-51-I

Launch Time
Tue Aug 27, 1985 10:58 UTC

Rocket

Space Shuttle Discovery
NASA
Status: Retired
Price: $450.0 million
Liftoff Thrust: 30,250 kN
Payload to LEO: 27,500 kg
Payload to GTO: 3,810 kg
Stages: 2
Strap-ons: 2
Rocket Height: 56.1 m

Vehicles

OV-103-6

Edwards Runway 23

Missions

STS-51-I

The three communications satellites were Aussat 1, a multi-purpose spacecraft owned by Australia; ASC-1, owned and operated by the American Satellite Company; and Syncom IV-4, leased to the Department of Defense by its builder, Hughes Co. Both Aussat 1 and ASC-1 were deployed on the day of the launch, 27 August. Syncom IV-4 was deployed two days later. All three achieved their planned geosynchronous orbits and became operational. On the fifth day of the mission, astronauts Fisher and van Hoften began repair efforts on the malfunctioning Syncom IV-3, following a successful rendezvous maneuver by Discovery. The effort was slowed by a problem in the Remote Manipulator System elbow joint. After a second EVA by Fisher and van Hoften, the satellite's control lever was repaired, permitting commands from the ground to activate the spacecraft's systems and eventually send it into its proper geosynchronous orbit. The two EVAs lasted a total of 11 hours and 46 minutes.
Total Mass: 17,540 kg
Low Earth Orbit

Location