Titan IV

Titan IV

A Titan IV-B rocket carrying the Cassini-Huygens space research mission before takeoff from Launch Complex 40 on Cape Canaveral, 12 October 1997 (NASA)
Function	Heavy-lift launch vehicle
Manufacturer	Lockheed Martin
Country of origin	United States
Cost per launch	$432 million (USD)
Size
Height	50-62 m (164-207 ft)
Diameter	3.05 m (10 ft)
Mass	943,050 kg (2,079,060 lb)
Stages	3-5
Capacity
Payload to LEO
Mass	21,680 kg(47,790 lb)
Payload to Polar LEO
Mass	17,600 kg(38,800 lb)
Payload to GSO
Mass	5,760 kg(12,690 lb)
Payload to HCO
Mass	5,660 kg(12,470 lb)
Associated rockets
Family	Titan
Comparable	Atlas V, Delta IV Heavy, Falcon 9
Launch history
Status	Retired
Launch sites	SLC-40/41, Cape Canaveral SLC-4E, Vandenberg AFB
Total launches	39[1] (IVA: 22, IVB: 17)
Success(es)	35 (IVA: 20, IVB: 15)
Failure(s)	4 (IVA: 2, IVB: 2)
First flight	IV-A: 14 June 1989 IV-B: 23 February 1997
Last flight	IV-A: 12 August 1998 IV-B: 19 October 2005
Type of passengers/cargo	Lacrosse DSP Milstar Cassini-Huygens
Boosters (IV-A) – UA1207
No. boosters	2
Powered by	United Technologies UA1207
Maximum thrust	14.234 MN (3,200,000 lbf)
Specific impulse	272 seconds (2667 N·s/kg)
Burn time	120 seconds
Propellant	PBAN
Boosters (IV-B) – SRMU
No. boosters	2
Powered by	Hercules USRM[2]
Maximum thrust	15.12 MN (3,400,000 lbf)
Specific impulse	286 seconds (2805 N·s/kg)
Burn time	140 seconds
Propellant	HTPB
First stage
Powered by	2 LR87[3]
Maximum thrust	2,440 kN (548,000 lbf)
Specific impulse	302 seconds (2962 N·s/kg)
Burn time	164 seconds
Propellant	N2O4 / Aerozine 50
Second stage
Powered by	1 LR91
Maximum thrust	467 kN (105,000 lbf)
Specific impulse	316 seconds (3100 N·s/kg)
Burn time	223 seconds
Propellant	N2O4 / Aerozine 50
Third stage (Optional) – Centaur-T
Powered by	2 RL10
Maximum thrust	147 kN (33,100 lbf)
Specific impulse	444 seconds (4354 N·s/kg)
Burn time	625 seconds
Propellant	LH2/LOX
[edit on Wikidata]

Titan IV was a family of heavy-lift space launch vehicles developed by Martin Marietta and operated by the United States Air Force from 1989 to 2005.^[4] Launches were conducted from Cape Canaveral Air Force Station, Florida^[5] and Vandenberg Air Force Base, California.^[6]

The Titan IV was the last of the Titan family of rockets, originally developed by the Glenn L. Martin Company in 1958. It was retired in 2005 due to their high cost of operation and concerns over its toxic hypergolic propellants, and replaced with the Atlas V and Delta IV launch vehicles under the EELV program. The final launch (B-30) from Cape Canaveral occurred on 29 April 2005, and the final launch from Vandenberg AFB occurred on 19 October 2005.^[7] Lockheed Martin Space Systems built the Titan IVs near Denver, Colorado, under contract to the US government.^[1]

Two Titan IV vehicles are currently on display at the National Museum of the United States Air Force in Dayton, Ohio and the Evergreen Aviation and Space Museum in McMinnville, Oregon.