STS-51-I

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STS-51-I
STS-51-I SYNCOM IV-3 EVA by James van Hoften.jpg
van Hoften next to the crippled Syncom IV-3 (Leasat-3) satellite, during the mission's first EVA.
Names Space Transportation System-20
Mission typeSatellites deployment
Satellite repair
Operator NASA
COSPAR ID 1985-076A OOjs UI icon edit-ltr-progressive.svg
SATCAT no. 15992 OOjs UI icon edit-ltr-progressive.svg
Mission duration7 days, 2 hours, 17 minutes, 42 seconds
Distance travelled4,698,602 km (2,919,576 mi)
Orbits completed112
Spacecraft properties
Spacecraft Space Shuttle Discovery
Launch mass118,981 kg (262,308 lb)
Landing mass89,210 kg (196,670 lb)
Payload mass17,540 kg (38,670 lb) [1]
Crew
Crew size5
Members
EVAs 2
EVA duration
  • 11 hours, 46 minutes
  • 1st EVA: 7 hours, 20 minutes
  • 2nd EVA: 4 hours, 26 minutes
Start of mission
Launch dateAugust 27, 1985, 10:58:01 (August 27, 1985, 10:58:01)  UTC (6:58:01 am  EDT)
Launch site Kennedy, LC-39A
Contractor Rockwell International
End of mission
Landing dateSeptember 3, 1985, 13:15:43 (September 3, 1985, 13:15:43) UTC (6:15:43 am  PDT)
Landing site Edwards, Runway 23
Orbital parameters
Reference system Geocentric orbit
Regime Low Earth orbit
Perigee altitude 350 km (220 mi)
Apogee altitude 465 km (289 mi)
Inclination 28.45°
Period 92.00 minutes
Instruments
Physical Vapor Transport Organic Solid Experiment (PVTOS)
Sts-51-i-patch.png
STS-51-I mission patch
STS-51-I crew.jpg
Back row: James D. A. van Hoften, John M. Lounge, William F. Fisher
Front row: Joe H. Engle, Richard O. Covey
  STS-51-F (19)
STS-51-J (21) 

STS-51-I was the 20th mission of NASA's Space Shuttle program and the sixth flight of Space Shuttle Discovery. During the mission, Discovery deployed three communications satellites into orbit. The mission launched from Kennedy Space Center, Florida, on August 27, 1985, and landed at Edwards Air Force Base, California, on September 3, 1985.

Contents

Crew

Position Astronaut
Commander Joe H. Engle
Second and last spaceflight
Pilot Richard O. Covey
First spaceflight
Mission Specialist 1 James D. A. van Hoften
Second and last spaceflight
Mission Specialist 2
Flight Engineer
John M. Lounge
First spaceflight
Mission Specialist 3 William F. Fisher
Only spaceflight

Spacewalks

EVA 1
EVA 2

Crew seat assignments

Seat [2] LaunchLanding Space Shuttle seating plan.svg
Seats 1–4 are on the flight deck.
Seats 5–7 are on the mid-deck.
1Engle
2Covey
3van HoftenFisher
4Lounge
5Fishervan Hoften
6Unused
7Unused

Launch

AttemptPlannedResultTurnaroundReasonDecision pointWeather go (%)Notes
124 Aug 1985, 8:38:00 amScrubbedWeather24 Aug 1985, 9:06 am (T−00:05:00)Thunderstorms in the KSC area and a ship entering the SRB recovery area
225 Aug 1985, 7:57:00 amScrubbed0 days 23 hours 19 minutesTechnical25 Aug 1985, 8:11 am (T−00:09:00 hold)Computer failure
327 Aug 1985, 6:58:01 amSuccess1 day 23 hours 1 minuteLaunch delayed 3 minutes, 1 second for weather and ship in entering SRB recovery area.

Mission summary

Discovery launched at 6:58 a.m. EDT on August 27, 1985. Two earlier launch attempts, one on August 24 and another on August 25, were scrubbed – the first because of poor weather, [3] and the second because the backup orbiter computer failed and had to be replaced. [4] The successful launch on August 27, 1985, took place just as an approaching storm front reached the launch pad area.

The five-man STS-51-I crew included Joe H. Engle, commander; Richard O. Covey, pilot; and James D. A. van Hoften, John M. Lounge, and William F. Fisher, mission specialists. Their primary mission was to deploy three commercial communications satellites and retrieve and repair the Syncom IV-3 (Leasat-3) satellite, which had been deployed during the STS-51-D mission in April 1985, but had malfunctioned. In addition, a mid-deck materials processing experiment, the Physical Vapor Transport Organic Solid Experiment (PVTOS), was flown aboard Discovery.

The three communications satellites were Aussat-1, a multi-purpose spacecraft owned by Australia; ASC-1, owned and operated by the American Satellite Corporation (ASC); and Syncom IV-4 (Leasat-4), leased to the Department of Defense (DoD) by its builder, Hughes Space and Communications. Both Aussat-1 and ASC-1 were deployed on the day of the launch, August 27, 1985. Syncom IV-4 (Leasat-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 with the Remote Manipulator System (Canadarm) 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.

Discovery landed on Runway 23 at Edwards Air Force Base at 6:16 a.m. PDT on September 3, 1985. The flight lasted a total of 7 days, 2 hours, 18 minutes and 42 seconds, during which the shuttle completed 112 orbits of the Earth.

Mission insignia

The insignia depicts an American bald eagle, trailing red and white stripes, and pushing a boundary layer forward. The 19 stars, along with the eagle, are references to the 20th shuttle mission (with the eagle representing the orbiter and thus being the 20th "star"). Lining the patch are the surnames of the crew members.

Wake-up calls

NASA began a tradition of playing music to astronauts during the Project Gemini, and first used music to wake up a flight crew during Apollo 15. Each track is specially chosen, often by the astronauts' families, and usually has a special meaning to an individual member of the crew, or is applicable to their daily activities. [5]

Flight DaySongArtist/Composer
Day 2"Waltzing Matilda" [6] Banjo Paterson
Day 3"Over the Rainbow" Judy Garland
Day 4"I Saw the Light" Willie Nelson
Day 5"I Get Around" Beach Boys
Day 6"Lucky Old Sun" Willie Nelson
Day 7"Stormy Weather" [7] Willie Nelson
Day 8"Living in the USA" Linda Ronstadt

See also

Related Research Articles

Syncom started as a 1961 NASA program for active geosynchronous communication satellites, all of which were developed and manufactured by the Space and Communications division of Hughes Aircraft Company. Syncom 2, launched in 1963, was the world's first geosynchronous communications satellite. Syncom 3, launched in 1964, was the world's first geostationary satellite.

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STS-41-C was NASA's eleventh Space Shuttle mission, and the fifth mission of Space Shuttle Challenger. The launch, which took place on April 6, 1984, marked the first direct ascent trajectory for a Space Shuttle mission. During the mission, Challenger's crew captured and repaired the malfunctioning Solar Maximum Mission satellite, and deployed the Long Duration Exposure Facility (LDEF) experimental apparatus. STS-41-C was extended one day due to problems capturing the Solar Max satellite, and the landing on April 13, 1984, took place at Edwards Air Force Base, instead of at Kennedy Space Center as had been planned. The flight was originally numbered STS-13.

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<span class="mw-page-title-main">STS-41-D</span> 1984 American crewed spaceflight and maiden flight of Space Shuttle Discovery

STS-41-D was the 12th flight of NASA's Space Shuttle program, and the first mission of Space Shuttle Discovery. It was launched from Kennedy Space Center, Florida, on August 30, 1984, and landed at Edwards Air Force Base, California, on September 5, 1984. Three commercial communications satellites were deployed into orbit during the six-day mission, and a number of scientific experiments were conducted, including a prototype extendable solar array that would eventually form the basis of the main solar arrays on the International Space Station (ISS).

<span class="mw-page-title-main">STS-51-A</span> 1984 American crewed spaceflight to deploy and retrieve communications satellites

STS-51-A was the 14th flight of NASA's Space Shuttle program, and the second flight of Space Shuttle Discovery. The mission launched from Kennedy Space Center on November 8, 1984, and landed just under eight days later on November 16, 1984.

<span class="mw-page-title-main">STS-51-C</span> 1985 American crewed spaceflight for the Department of Defense

STS-51-C was the 15th flight of NASA's Space Shuttle program, and the third flight of Space Shuttle Discovery. It launched on January 24, 1985, and made the fourth shuttle landing at the Shuttle Landing Facility at the Kennedy Space Center in Florida on January 27, 1985. STS-51-C was the first shuttle mission dedicated to the United States Department of Defense (DoD), and consequently many details remain classified. NASA reported that a satellite (USA-8) was deployed during the mission using an Inertial Upper Stage booster was deployed and met mission objectives. At just over three days, the mission was shorter in duration than most civilian missions and was the shortest of Discovery's career.

<span class="mw-page-title-main">STS-51-D</span> 1985 American crewed spaceflight to deploy communications satellites

STS-51-D was the 16th flight of NASA's Space Shuttle program, and the fourth flight of Space Shuttle Discovery. The launch of STS-51-D from Kennedy Space Center (KSC), Florida, on April 12, 1985, was delayed by 55 minutes, after a boat strayed into the restricted Solid Rocket Booster (SRB) recovery zone. STS-51-D was the third shuttle mission to be extended.

<span class="mw-page-title-main">STS-61-B</span> 1985 American crewed spaceflight

STS-61-B was the 23rd NASA Space Shuttle mission, and its second using Space Shuttle Atlantis. The shuttle was launched from Kennedy Space Center, Florida, on November 26, 1985. During STS-61-B, the shuttle crew deployed three communications satellites, and tested techniques of constructing structures in orbit. Atlantis landed at Edwards Air Force Base, California, at 16:33:49 EST on December 3, 1985, after 6 days, 21 hours, 4 minutes, and 49 seconds in orbit.

<span class="mw-page-title-main">STS-49</span> 1992 American crewed spaceflight to Intelsat 603 and maiden flight of Shuttle Endeavour

STS-49 was NASA's maiden flight of the Space Shuttle Endeavour, which launched on May 7, 1992. The primary goal of its nine-day mission was to retrieve an Intelsat VI satellite, Intelsat 603, which failed to leave Low Earth orbit two years before, attach it to a new upper stage, and relaunch it to its intended geosynchronous orbit. After several attempts, the capture was completed with the only three-person extravehicular activity (EVA) in space flight history. It would also stand until STS-102 in 2001 as the longest EVA ever undertaken.

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<span class="mw-page-title-main">STS-51</span> 1993 American crewed spaceflight

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<span class="mw-page-title-main">James van Hoften</span> American astronaut and engineer (born 1944)

James Dougal Adrianus "Ox" van Hoften is an American civil and hydraulic engineer, retired U.S. Navy officer and aviator, and a former astronaut for NASA.

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<span class="mw-page-title-main">John M. Lounge</span> American astronaut and engineer (1946–2011)

John Michael "Mike" Lounge was an American engineer, a United States Navy officer, a Vietnam War veteran, and a NASA astronaut. A veteran of three Space Shuttle flights, Lounge logged over 482 hours in space. He was a mission specialist on STS-51-I (1985) and STS-26 (1988) and was the flight engineer on STS-35 (1990).

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References

  1. "STS-51-I Press Kit" (PDF). NASA. February 11, 2015.PD-icon.svg This article incorporates text from this source, which is in the public domain.
  2. 1 2 3 "STS-51I". Spacefacts. Retrieved February 26, 2014.
  3. O'Toole, Thomas (August 24, 1985). "Rain Delays Discovery's Liftoff". The Washington Post. Retrieved November 16, 2024.
  4. O'Toole, Thomas (August 26, 1985). "Computer Failure Grounds Shuttle". The Washington Post. Retrieved November 16, 2024.
  5. Fries, Colin (June 25, 2007). "Chronology of Wakeup Calls" (PDF). NASA. Archived from the original (PDF) on December 20, 2023. Retrieved August 13, 2007.PD-icon.svg This article incorporates text from this source, which is in the public domain .
  6. Chosen to waken the crew as they passed over Australia.
  7. Chosen due to Hurricane Elena, which had been observed earlier from Discovery.