Atlas 5
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Launch of an Atlas V 401 carrying the LRO and LCROSS
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| Function | EELV/Medium-heavy launch vehicle |
|---|---|
| Manufacturer | United Launch Alliance |
| Country of origin | United States |
| Size | |
| Height | 58.3 meters (191 ft) |
| Diameter | 3.81 meters (12.5 ft) |
| Mass | 334,500 kilograms (737,400 lb) |
| Stages | 2 |
| Capacity | |
| Payload to LEO | 9,800–18,810 kilograms (21,610–41,470 lb) |
| Payload to GTO | 4,750–8,900 kilograms (10,470–19,620 lb) |
| Associated rockets | |
| Comparable | Delta IV, Falcon 9 FT |
| Launch history | |
| Status | Active |
| Launch sites |
Cape Canaveral SLC-41 Vandenberg SLC-3E |
| Total launches | 71 (401: 36, 411: 4, 421: 6, 431: 3) (501: 6, 521: 2, 531: 3, 541: 4, 551: 7) |
| Successes | 70 (401: 35, 411: 4, 421: 6, 431: 3) (501: 6, 521: 2, 531: 3, 541: 4, 551: 7) |
| Partial failures | 1 (401) |
| First flight |
401: 21 August 2002 411: 20 April 2006 421: 10 October 2007 431: 11 March 2005 501: 22 April 2010 521: 17 July 2003 531: 14 August 2010 541: 26 November 2011 551: 19 January 2006 |
| Last flight |
401: 18 April 2017 (OA-7) 411: 09 September 2016 (OSIRS-REx) 421: 28 July 2016 (NROL-61) 431: 18 December 2016 (EchoStar-19) 501: 20 May 2015 (AFSPC-5) 521: 17 December 2004 (AMC-16) 531: 18 September 2013 (AEHF-3) 541: 19 November 2016 (GOES-R) 551: 24 June 2016 (MUOS-5) |
| Notable payloads |
Mars Reconnaissance Orbiter New Horizons LRO/LCROSS Solar Dynamics Observatory Boeing X-37B Juno Mars Science Laboratory Van Allen Probes TDRS-K, L Landsat 8 MAVEN MMS Cygnus OA-4, OA-6, OA-7 OSIRIS-REx GOES-R |
| Boosters - AJ-60A | |
| No. boosters | 0 to 5 |
| Length | 17.0 m (669 in) |
| Diameter | 1.6 m (62 in) |
| Gross mass | 46,697 kg (102,949 lb) |
| Thrust | 1,688.4 kN (379,600 lbf) |
| Specific impulse | 279.3 seconds (2.739 km/s) |
| Burn time | 94 seconds |
| Fuel | HTPB |
| First stage - Atlas CCB | |
| Length | 32.46 m (106.5 ft) |
| Diameter | 3.81 m (12.5 ft) |
| Empty mass | 21,054 kg (46,416 lb) |
| Propellant mass | 284,089 kg (626,309 lb) |
| Engines | 1 RD-180 |
| Thrust | 3,827 kN (860,000 lbf) (SL) 4,152 kN (933,000 lbf) (Vac) |
| Specific impulse | 311.3 seconds (3.053 km/s) (SL) 337.8 seconds (3.313 km/s) (Vac) |
| Burn time | 253 seconds |
| Fuel | RP-1/LOX |
| Second stage - Centaur | |
| Length | 12.68 m (41.6 ft) |
| Diameter | 3.05 m (10.0 ft) |
| Empty mass | 2,316 kg (5,106 lb) |
| Propellant mass | 20,830 kg (45,920 lb) |
| Engines | 1 RL10A or 1 RL10C |
| Thrust | 99.2 kN (22,300 lbf) (RL10A) |
| Specific impulse | 450.5 seconds (4.418 km/s) (RL10A-4-2) |
| Burn time | 842 seconds (RL10A-4-2) |
| Fuel | LH2/LOX |
Atlas V is an active expendable launch system in the Atlas rocket family. Atlas V was formerly operated by Lockheed Martin, and is now operated by the Lockheed Martin-Boeing joint venture United Launch Alliance (ULA). Each Atlas V rocket uses a Russian-built RD-180 engine burning kerosene and liquid oxygen to power its first stage and an American-built RL10 engine burning liquid hydrogen and liquid oxygen to power its Centaur upper stage. The RD-180 engines are provided by RD Amross, while Aerojet Rocketdyne provides both the RL10 engines and the strap-on boosters used in some configurations. The standard payload fairing sizes are 4 or 5 meters in diameter and of various lengths. Fairings sizes as large as 7.2 m in diameter and up to 32.3 m in length have been considered. The rocket is assembled in Decatur, Alabama and Harlingen, Texas.
The Atlas V was developed by Lockheed Martin Commercial Launch Services as part of the US Air Force Evolved Expendable Launch Vehicle (EELV) program and made its inaugural flight on August 21, 2002. The vehicle operates out of Space Launch Complex 41 at Cape Canaveral Air Force Station and Space Launch Complex 3-E at Vandenberg Air Force Base. Lockheed Martin Commercial Launch Services continues to market the Atlas V to commercial customers worldwide.
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