Inertial Upper Stage

IUS
The Inertial Upper Stage (IUS), originally designated the Interim Upper Stage, was a two-stage solid-fueled rocket upper stage developed by Boeing for the United States Air Force beginning in 1976 for raising payloads from low Earth orbit to higher orbits or interplanetary trajectories following launch aboard a Titan 34D or Titan IV rocket, or from the payload bay of the Space Shuttle.wikipedia
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Titan IV

Titan IV(401)BTitan IVBTitan IVB/Centaur
The Inertial Upper Stage (IUS), originally designated the Interim Upper Stage, was a two-stage solid-fueled rocket upper stage developed by Boeing for the United States Air Force beginning in 1976 for raising payloads from low Earth orbit to higher orbits or interplanetary trajectories following launch aboard a Titan 34D or Titan IV rocket, or from the payload bay of the Space Shuttle.
The post-Challenger program also involved flying IUS (Inertial Upper Stage) or even no upper stages.

Titan 34D

Commercial Titan IIIInadvertent Separation Destruct System
The Inertial Upper Stage (IUS), originally designated the Interim Upper Stage, was a two-stage solid-fueled rocket upper stage developed by Boeing for the United States Air Force beginning in 1976 for raising payloads from low Earth orbit to higher orbits or interplanetary trajectories following launch aboard a Titan 34D or Titan IV rocket, or from the payload bay of the Space Shuttle.
A variety of upper stages were available, including the Inertial Upper Stage, the Transfer Orbit Stage, and the Transtage.

Space Shuttle

Shuttlespace shuttlesSpace Shuttle Program
The Inertial Upper Stage (IUS), originally designated the Interim Upper Stage, was a two-stage solid-fueled rocket upper stage developed by Boeing for the United States Air Force beginning in 1976 for raising payloads from low Earth orbit to higher orbits or interplanetary trajectories following launch aboard a Titan 34D or Titan IV rocket, or from the payload bay of the Space Shuttle.
Some payloads were launched into higher orbits with either of two different upper stages developed for the STS (single-stage Payload Assist Module or two-stage Inertial Upper Stage).

STS-51-C

shuttle flight in January 1985
The Air Force only stated that the shuttle successfully launched its payload with an Inertial Upper Stage on the mission's seventh orbit.

Centaur (rocket stage)

CentaurCentaur upper stageCentaur-G
The candidates were the Centaur, propelled by liquid hydrogen and liquid oxygen, the Transtage, propelled by hypergolic storable propellants Aerozine-50 and, and the Interim Upper Stage, using solid propellant.
During the development of the shuttle in the 1970s, NASA debated whether to use a solid-fueled Inertial Upper Stage (IUS) instead of a Centaur.

TDRS-B

TDRS-B was launched in the payload bay of Challenger, attached to an Inertial Upper Stage (IUS).

Magnum (satellite)

MagnumMagnum/OrionMagnum satellite
The satellites reportedly have a mass of 2200 - 2700 kg, operating in near-geosynchronous orbits, using Inertial Upper Stages to get from the shuttle's orbit to the higher geosynchronous orbit.

Magellan (spacecraft)

MagellanMagellan'' spacecraftMagellan'' (spacecraft)
The Magellan probe was the first interplanetary mission to be launched from the Space Shuttle, the first one to use the Inertial Upper Stage booster for launching, and the first spacecraft to test aerobraking as a method for circularizing its orbit.

STS-6

6makes its maiden voyage
The first launch of the IUS was in 1982 on a Titan 34D rocket from the Cape Canaveral Air Force Station shortly before the STS-6 Space Shuttle mission.
Although the 5000 lbs TDRS satellite was successfully deployed from Challenger, its two-stage booster rocket, the Inertial Upper Stage (IUS), tumbled out of control, placing the satellite into a low elliptical orbit.

STS-30

30
The primary payload, the Magellan spacecraft with its attached Inertial Upper Stage (IUS), was successfully deployed later that day.

STS-51-J

12its maiden flight
Its cargo was classified, but it was reported that two ( USA-11 and USA-12) DSCS-III (Defense Satellite Communications System) satellites were launched into stationary orbits by an Inertial Upper Stage.

Galileo (spacecraft)

GalileoGalileo'' spacecraftGalileo spacecraft
The Inertial Upper Stage booster was going to be used at first, but this changed to the Centaur booster, then back to IUS after Challenger.

Transtage

TS-1
The candidates were the Centaur, propelled by liquid hydrogen and liquid oxygen, the Transtage, propelled by hypergolic storable propellants Aerozine-50 and, and the Interim Upper Stage, using solid propellant.
Inertial Upper Stage

STS-41

Attached to Ulysses were two upper stages, the Inertial Upper Stage (IUS) and a mission-specific Payload Assist Module-S (PAM-S), combined together for first time to send Ulysses toward an out-of-ecliptic trajectory.

STS-34

34Mission STS-34
The primary payload, the Galileo spacecraft with its attached Inertial Upper Stage (IUS), was successfully deployed on its journey to Jupiter.

STS-43

The primary payload, Tracking and Data Relay Satellite-5 (TDRS-5 or TDRS-E), attached to an Inertial Upper Stage (IUS), was deployed about six hours into flight, and the IUS propelled the satellite into geosynchronous orbit.

STS-26

STS-26RReturn to Flight
TDRS-C, which became TDRS-3 in orbit, and its attached Inertial Upper Stage (IUS), were deployed from Discovery's cargo bay six hours and 13 minutes into the flight.

Defense Support Program

DSPDSP-23(DSP)
Typically, DSP satellites were launched on Titan IVB boosters with Inertial Upper Stages.

TDRS-3

TDRS-CTDRS-3,
TDRS-C was deployed from Discovery around six hours after launch, and was raised to geostationary orbit by means of an Inertial Upper Stage.

TDRS-4

TDRS-D
TDRS-D was deployed from Discovery a few hours after launch, and was raised to geostationary orbit by means of an Inertial Upper Stage.

STS-44

A launch set for 19 November was delayed due to replacement and testing of a malfunctioning redundant inertial measurement unit on the Inertial Upper Stage booster attached to the Defense Support Program satellite.

STS-54

DXS
It was later successfully transferred to its proper orbit by the Inertial Upper Stage booster.

STS-70

70
The primary mission was the launch and deployment of the 7th Tracking and Data Relay Satellite (TDRS) by means of the two-stage Inertial Upper Stage (IUS) solid rocket.

STS-93

The primary objective of the STS-93 mission was to deploy the Chandra X-ray Observatory (formerly the Advanced X-ray Astrophysics Facility) with its Inertial Upper Stage booster.

Chandra X-ray Observatory

ChandraChandra observatoryChandra Space Telescope
At 22753 kg, it was the heaviest payload ever launched by the shuttle, a consequence of the two-stage Inertial Upper Stage booster rocket system needed to transport the spacecraft to its high orbit.