STS-51-I

STS-51-I
	Mission Specialist James Van Hoften working on the crippled Syncom IV-3 satellite
Mission type	Satellite deployment ; Satellite repair
Operator	NASA
COSPAR ID	1985-076A
SATCAT no.	15992
Mission duration	7 days, 2 hours, 17 minutes, 42 seconds
Distance travelled	4,698,602 kilometres (2,919,576 mi)
Orbits completed	112
Spacecraft properties
Spacecraft	Space Shuttle Discovery
Launch mass	118,981 kilograms (262,309 lb)
Landing mass	89,210 kilograms (196,674 lb)
Payload mass	29,772 kilograms (65,635 lb)
Crew
Crew size	5
Members	Joe H. Engle; Richard O. Covey; James D. A. van Hoften; John M. Lounge; William F. Fisher
EVAs	2
EVA duration	11 hours, 46 minutes; First: 7 hours, 20 minutes; Second: 4 hours, 26 minutes
Start of mission
Launch date	August 27, 1985, 10:58:01 UTC
Launch site	Kennedy LC-39A
End of mission
Landing date	September 3, 1985, 13:15:43 UTC
Landing site	Edwards Runway 23
Orbital parameters
Reference system	Geocentric
Regime	Low Earth
Perigee altitude	350 kilometres (220 mi)
Apogee altitude	465 kilometres (289 mi)
Inclination	28.45 degrees
Period	92 min
	; Back row L-R: van Hoften, Lounge, Fisher; Front row L-R: Engle, Covey Space Shuttle program ← STS-51-F STS-51-J →

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.

Crew


Position	Astronaut
Commander	Joe H. Engle Second^[1] spaceflight
Pilot	Richard O. Covey First spaceflight
Mission Specialist 1	James D. A. van Hoften Second spaceflight
Mission Specialist 2	John M. Lounge First spaceflight
Mission Specialist 3	William F. Fisher First spaceflight

Spacewalks

Fisher and van Hoften – EVA 1
EVA 1 Start: August 31, 1985
EVA 1 End: August 31, 1985
Duration: 7 hours, 20 minutes

Fisher and van Hoften – EVA 2
EVA 2 Start: September 1, 1985
EVA 2 End: September 1, 1985
Duration: 4 hours, 26 minutes

Crew seating arrangements

Seat^[2]	Launch	Landing	Seats 1–4 are on the Flight Deck. Seats 5–7 are on the Middeck.
S1	Engle	Engle
S2	Covey	Covey
S3	van Hoften	Fisher
S4	Lounge	Lounge
S5	Fisher	van Hoften

Launch

Attempt	Planned	Result	Turnaround	Reason	Decision point	Notes
1	24 Aug 1985, 10:55:00 am	scrubbed	—	weather	(T-5:00)
2	25 Aug 1985, 10:55:00 am	scrubbed	1 day 0 hours 0 minutes	technical		number 5 computer failure
3	27 Aug 1985, 10:58:01 am	success	2 days 0 hours 3 minutes			launch delayed three minutes, one second for weather and ship in entering SRB recovery area

Mission summary

Discovery launched at 6:58 am 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, and the second because the backup orbiter computer failed and had to be replaced. The successful launch on August 27 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 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 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 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.

Discovery landed on Runway 23 at Edwards Air Force Base at 6:16 am 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 111 orbits of the Earth.

Gallery

Deployment of Aussat 1
Deployment of ASC-1
Deployment of Syncom IV-4

Wake-up calls

NASA began a tradition of playing music to astronauts during the Gemini program, 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.^[3]

Flight Day	Song	Artist/Composer
Day 2	"Waltzing Matilda"^[4]
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"^[5]	Willie Nelson
Day 8	"Living in the USA"	Linda Ronstadt

References

This article incorporates public domain material from websites or documents of the National Aeronautics and Space Administration.

^ Engle exceeded an altitude of 80 kilometres (50 mi) three times as a test pilot in the X-15 program; these are regarded spaceflights by the US Air Force but not by any other body and did not reach what is recognised internationally as the edge of space. STS-51-I was his second Space Shuttle flight, and his second flight above the Kármán line.
^ "STS-51I". Spacefacts. Retrieved February 26, 2014.
^ Fries, Colin (June 25, 2007). "Chronology of Wakeup Calls" (PDF). NASA. Retrieved August 13, 2007.
^ Chosen to waken the crew as they passed over Australia.
^ Chosen due to Hurricane Elena, which had been observed earlier from Discovery.

External links

[1] Engle exceeded an altitude of 80 kilometres (50 mi) three times as a test pilot in the X-15 program; these are regarded spaceflights by the US Air Force but not by any other body and did not reach what is recognised internationally as the edge of space. STS-51-I was his second Space Shuttle flight, and his second flight above the Kármán line.

[2] "STS-51I". Spacefacts. Retrieved February 26, 2014.

[chronology-3] Fries, Colin (June 25, 2007). "Chronology of Wakeup Calls" (PDF). NASA. Retrieved August 13, 2007.

[4] Chosen to waken the crew as they passed over Australia.

[5] Chosen due to Hurricane Elena, which had been observed earlier from Discovery.

[1]

[2]

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[5]

v t e Space Shuttle Discovery (OV-103)
Completed flights	STS-41-D STS-51-A STS-51-C STS-51-D STS-51-G STS-51-I STS-26 STS-29 STS-33 STS-31 STS-41 STS-39 STS-48 STS-42 STS-53 STS-56 STS-51 STS-60 STS-64 STS-63 STS-70 STS-82 STS-85 STS-91 STS-95 STS-96 STS-103 STS-92 STS-102 STS-105 STS-114 STS-121 STS-116 STS-120 STS-124 STS-119 STS-128 STS-131 STS-133
Status	Retired
On display	Steven F. Udvar-Hazy Center, Washington, D.C.
Related	Destiny in Space (1994 documentary)

v t e ← 1984 Orbital launches in 1985 1986 →
January	STS-51-C (USA-8)
February	USA-9 Arabsat-1A Brasilsat A1
March	Geosat Intelsat VA F-10
April	STS-51-D (Anik C1, Leasat 3) STS-51-B (Nusat)
May	GStar-1 Telecom 1B
June	Soyuz T-13 STS-51-G (Morelos 1, Arabsat-1B, Telstar 3D, SPARTAN-101) Progress 24 Intelsat VA F-11
July	Giotto Kosmos 1669 STS-51-F (PDP)
August	STS-51-I (Aussat A1, ASC-1, Leasat 4)
September	Spacenet 3 Soyuz T-14 Kosmos 1686 Intelsat VA F-12
October	STS-51-J (USA-11, USA-12) USA-10 STS-61-A (GLOMR)
November	STS-61-B (Morelos 2, Aussat A2, Satcom K2, OEX, EASE/ACCESS)
Unknown month	Sakigake Kosmos 1616 Kosmos 1617 Kosmos 1618 Kosmos 1619 Kosmos 1620 Kosmos 1621 Kosmos 1622 Molniya-3 No.36 Kosmos 1623 Kosmos 1624 Gorizont No.21L Kosmos 1625 Kosmos 1626 Kosmos 1627 Kosmos 1628 Meteor-2 No.13 Kosmos 1629 Kosmos 1630 Kosmos 1631 Kosmos 1632 Kosmos 1633 Kosmos 1634 Kosmos 1635 Kosmos 1636 Kosmos 1637 Kosmos 1638 Kosmos 1639 Kosmos 1640 Kosmos 1641 Kosmos 1642 Ekran No.28L Kosmos 1643 Kosmos 1644 Unnamed Kosmos 1645 Kosmos 1646 Kosmos 1647 Kosmos 1648 Prognoz 10 Kosmos 1649 Kosmos 1650 Kosmos 1651 Kosmos 1652 Kosmos 1653 Kosmos 1654 Molniya-3 No.39 Kosmos 1655 Kosmos 1656 Kosmos 1657 Kosmos 1658 Kosmos 1659 Kosmos 1660 Kosmos 1661 Kosmos 1662 Kosmos 1663 Unnamed Kosmos 1664 Kosmos 1665 Kosmos 1666 Kosmos 1667 Kosmos 1668 Molniya-3 No.37 Kosmos 1670 Kosmos 1671 Transit-O 24 Transit-O 30 Kosmos 1672 Kosmos 1672 Kosmos 1673 Kosmos 1674 Gran' No.26L Kosmos 1675 Kosmos 1676 Suisei Molniya-1 No.61 Kosmos 1677 Unnamed Kosmos 1678 Kosmos 1679 Kosmos 1680 Kosmos 1681 ECS-3 Kosmos 1682 Kosmos 1683 Kosmos 1684 Kosmos 1685 Kosmos 1687 Kosmos 1688 Kosmos 1689 Molniya-3 No.38 Kosmos 1690 Kosmos 1695 Kosmos 1692 Kosmos 1693 Kosmos 1694 Kosmos 1691 Kosmos 1696 Fanhui Shi Weixing 8 Kosmos 1697 Kosmos 1698 Molniya-1 No.73 Unnamed Meteor-3 No.2 Kosmos 1699 Kosmos 1700 Molniya-1 No.56 Kosmos 1701 Kosmos 1702 Gran' No.28L Kosmos 1703 Kosmos 1704 Kosmos 1705 Kosmos 1706 Kosmos 1707 USA-13 USA-14 Kosmos 1708 Kosmos 1709 Molniya-3 No.40 Kosmos 1710 Kosmos 1711 Kosmos 1712 Meteor-2 No.14 Kosmos 1713 Kosmos 1714
Payloads are separated by bullets ( · ), launches by pipes ( \| ). Crewed flights are indicated in underline. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in (brackets).