Launch of an Atlas V 401 carrying the LRO and LCROSS
|Function||EELV/Medium-heavy launch vehicle|
|Manufacturer||United Launch Alliance|
|Country of origin||United States|
|Height||58.3 m (191.2 ft)|
|Diameter||3.81 m (12.49 ft)|
|Mass||334,500 kg (737,400 lb)|
|Payload to LEO||9,370–29,400 kg (20,650–64,820 lb)|
|4,750–13,000 kg (10,470–28,660 lb)|
|Launch sites||SLC-41, Cape Canaveral
SLC-3E, Vandenberg AFB
(401: 18, 411: 3, 421: 3, 431: 2)
(501: 4, 521: 2, 531: 2, 541: 1, 551: 3)
(401: 17, 411: 3, 421: 3, 431: 2)
(501: 4, 521: 2, 531: 2, 541: 1, 551: 3)
|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
|Notable payloads||Mars Reconnaissance Orbiter
Lunar Reconnaissance Orbiter
Solar Dynamics Observatory
Mars Science Laboratory
|Boosters (Not Heavy) - Aerojet|
|No. boosters||1 to 5 (see text)|
|Thrust||1,270 kN (285,500 lbf)|
|Specific impulse||275 seconds|
|Burn time||94 seconds|
|Boosters (Atlas V Heavy (5HX) (Proposed)) - Atlas CCB|
|Engines||1 RD-180 (2 nozzles)|
|Thrust||4,152 kN (933,406 lbf)|
|Specific impulse||311 seconds|
|Burn time||253 seconds|
|First stage - Atlas CCB|
|Engines||1 RD-180 (2 nozzles)|
|Thrust||4,152 kN (933,400 lbf)|
|Specific impulse||311 seconds|
|Burn time||253 seconds|
|Second stage (Atlas V XX1) - Centaur|
|Thrust||99.2 kN (22,300 lbf)|
|Specific impulse||451 seconds|
|Burn time||842 seconds|
|Second stage (Atlas V XX2) - Centaur|
|Thrust||185 kN (41,600 lbf)|
|Specific impulse||449 seconds|
|Burn time||421 seconds|
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. 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 and the RL10 engines by Pratt & Whitney Rocketdyne. Some configurations also use strap-on booster rockets made by Aerojet. The standard payload fairing sizes are 4 or 5 meters in diameter and of various lengths, are made by RUAG Space. Fairings sizes as large as 7.2m in diameter and up to 32.3m in length have been considered. The rocket is assembled in Decatur, Alabama; Harlingen, Texas; San Diego, California; and at United Launch Alliance's headquarters near Denver, Colorado.
In its more than three dozen launches, starting with its maiden launch in August 2002, Atlas V has had a near-perfect success rate. One flight on June 15, 2007, NRO L-30, experienced an upper-stage anomaly when the engine in the vehicle's Centaur upper stage shut down four seconds early, leaving the payload—a pair of ocean surveillance satellites—in a lower than intended orbit. However, the customer, the National Reconnaissance Office, categorized the mission as a success.
- The "1.5 staging" technique was dropped on the Atlas III, in favor of a more-advanced RD-180 engine.
- The main-stage diameter increased from 10 feet to 12.5 feet. As with the Atlas III, the different mixture ratio of the engine called for a larger oxygen tank (relative to the fuel tank) compared to western engines and stages.
- First-stage tanks no longer use stainless steel monocoque "balloon" construction. The tanks are isogrid aluminum and are stable when unpressurized.
- Use of aluminum, with a higher thermal conductivity than stainless steel, requires insulation for the liquid oxygen. The tanks are covered in a polyurethane-based layer.
- Accommodation points for parallel stages, both smaller solids and identical liquids, are built into first-stage structures.
The Atlas V was developed by Lockheed Martin Commercial Launch Services as part of the US Air Force Evolved Expendable Launch Vehicle (EELV) program. The term expendable launch vehicle means each vehicle is only used once. Launches are from 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.
The first Atlas V was launched on August 21, 2002, and all subsequent launches have been successful except for the 2007 anomaly. The Atlas V family uses a single-stage Atlas main engine, the Russian RD-180 and the newly developed Common Core Booster (CCB) with up to five Aerojet made strap-on solid rocket boosters. The CCB is 12.5 ft (3.8 m) in diameter by 106.6 ft (32.5 m) long and uses 627,105 lb (284,450 kg) of liquid oxygen and RP-1 rocket fuel propellants. The booster operates for about four minutes, providing about 4 meganewtons (860,000 lbf) of thrust at start, the major part of this thrust, 4.152 meganewtons being provided by Russian RD-180 engine.
The Centaur upper stage uses a pressure stabilized propellant tank design and cryogenic propellants. The Centaur stage for Atlas V is stretched 5.5 ft (1.68 m) relative to the Atlas IIAS Centaur and is powered by either one or two Pratt & Whitney RL10A-4-2 engines, each engine developing a thrust of 99.2 kN (22,300 lbf). Operational and reliability upgrades are enabled with the RL10A-4-2 engine configuration. The inertial navigation unit (INU) located on the Centaur provides guidance and navigation for both Atlas and Centaur, and controls both Atlas and Centaur tank pressures and propellant use. The Centaur engines are capable of multiple in-space starts, making possible insertion into low-earth parking orbit, followed by a coast period and then insertion into GTO. A subsequent third burn following a multi-hour coast can permit direct injection of payloads into geostationary orbit. As of 2006[update], the Centaur vehicle had the highest proportion of burnable propellant relative to total mass of any modern hydrogen upper stage and hence can deliver substantial payloads to a high energy state.
Many systems on the Atlas V have been the subject of upgrade and enhancement both prior to the first Atlas V flight and since that time. Work on a new Fault Tolerant Inertial Navigation Unit (FTINU) started in 2001 to enhance mission reliability for Atlas vehicles by replacing the existing non-redundant navigation and computing equipment with a fault tolerant unit.[full citation needed] The upgraded FTINU first flew in 2005,[full citation needed] and in 2010 a follow-on order for more FTINU units was awarded.[full citation needed]
2007 valve anomaly 
The only anomalous event in the use of the Atlas V launch system occurred June 15, 2007, when the engine in the Centaur upper stage of an Atlas V shut down early, leaving its payload–a pair of NRO L-30 ocean surveillance satellites–in a lower-than-intended orbit. The cause of the anomaly was traced to a leaky valve, which allowed fuel to leak during the coast between the first and second burns. The resulting lack of fuel caused the second burn to terminate 4 seconds early. Replacing the valve led to a delay in the next Atlas V launch.
GX rocket 
The Atlas V Common Core Booster was to have been used as the first stage of the joint US-Japanese GX rocket, which was scheduled to make its maiden flight in 2012. GX launches would have been from the Atlas V launch complex at Vandenberg AFB, SLC-3E.
In December 2009, Japanese government decided to cancel the GX project.
In 2013, the cost for an Atlas V 541 launch to GTO (including launch services, payload processing, launch vehicle integration mission, unique launch site ground support and tracking, data and telemetry services) was about US$ 223 million (inflation adjusted US$ 223 million in 2013).
Future developments 
Atlas V CTS (Crew Transportation System) 
As early as 2006, ULA's predecessor company Lockheed Martin was looking at a human-rated version of the Atlas V. An agreement between Lockheed and Bigelow Aerospace that year was reported that could lead to commercial private trips to low-Earth orbit (LEO).
Beginning in 2010, ULA did design and simulation work to human-rate the Atlas V for carrying passengers. ULA won a 2010 small contract of US$6.7 million in the first phase of the NASA Commercial Crew Development Program (CCDev) to develop an Emergency Detection System (EDS) for human-rating the Atlas V launch vehicle. As of February 2011[update], ULA "is still finishing up work on its $6.7-million award... In December ULA carried out a demonstration of its Emergency Detection System ... The company said it received an extension from NASA until April 2011 'to enable us to finish critical timing analyses tasks' for [the] fault coverage analysis work."
NASA solicited proposals for CCDev phase 2 in October 2010, under which ULA made a proposal for funding to "finish designing a key safety system for potential commercial crew launches on its Atlas and Delta rocket fleet." While NASA's goal is to get astronauts to orbit by 2015, ULA President and CEO Michael Gass has stated "I think we need to stretch our goals to have commercial crew service operating by 2014" and has committed ULA to meet that schedule. Other than the addition of the Emergency Detection System, no major changes are expected to the Atlas V rocket, but ground infrastructure modifications are planned. The most likely candidate for the human-rating is the 402 configuration, with dual RL10 engines on the Centaur upper stage and no solid rocket boosters.
On July 18, 2011 NASA and ULA announced an agreement on the possibility of certifying the Atlas V to NASA's "human-rating" standards. ULA will provide NASA with data on the Atlas V, while NASA will provide ULA with draft human certification requirements. As of July 2011[update] Bigelow Aerospace is still considering the use of a human-rated Atlas V for carrying spaceflight participants to its private space station. Sierra Nevada Corporation (SNC) picked the Atlas V to be the booster for its still in development Dream Chaser crewed spacecraft. The Dream Chaser is designed to be a crewed vertical-takeoff, horizontal-landing (VTHL) lifting-body spaceplane that will be placed into LEO by an Atlas V, and is a proposed CCDev ISS crew transport vehicle.
On August 4, 2011 Boeing announced it would use the Atlas V as the initial launch vehicle for its CST-100 crewed spaceship, intended for both NASA-funded trips to the International Space Station, as well as private trips to the proposed Bigelow Commercial Space Station. A three-flight test program is projected to be completed by 2015, and potentially will certify the Atlas V/CST-100 combination for human-spaceflight operations. The first flight is expected to include an Atlas 5 rocket integrated with an unpiloted CST-100 capsule, to launch from Cape Canaveral's LC-41 in early 2015 into LEO. The second flight is scheduled to be an in-flight launch abort system demonstration in the middle of that year. The test-flight phase is expected to culminate with a crewed mission at the end of 2015, carrying two Boeing test-pilot astronauts into LEO and returning them safely. In August 2012, George Sowers, ULA's vice president for Human Launch Services, stated that if funded the first manned flight of the Atlas V could occur by late 2015.
Atlas V HLV 
The Atlas V HLV (Heavy Lift Vehicle) would use three Common Core Booster (CCB) stages strapped together to lift a 29,400 kg (64,816 lb) payload to low Earth orbit. Approximately 95% of the hardware required for the Atlas HLV has already been flown on the Atlas V single core vehicles.
A report, prepared by RAND Corporation for the Office of the Secretary of Defense in 2006, stated that Lockheed Martin had decided not to develop an Atlas V heavy-lift vehicle (HLV). The report recommended for the Air Force and the National Reconnaissance Office to "determine the necessity of an EELV heavy-lift variant, including development of an Atlas V Heavy", and to "resolve the RD-180 issue, including coproduction, Stockpile, or U.S. development of an RD-180 replacement."
The lifting capability of the Atlas V HLV is roughly equivalent to the Delta IV Heavy. The latter utilizes RS-68 engines developed and produced domestically by Pratt & Whitney Rocketdyne.
Atlas Phase 2 
With the merger of Boeing and Lockheed-Martin space operations into United Launch Alliance, the Atlas V program gained access to the tooling and processes for 5-meter-diameter stages, used on Delta IV. At 5 meters, a stage can accept dual RD-180 engines.[clarification needed] The proposed heavy-lift vehicle is "Atlas Phase 2" or "PH2".[clarification needed] An Atlas V PH2-Heavy (three 5 m stages in parallel; six RD-180s) along with Shuttle-derived, Ares V and Ares V Lite, was considered as a possible heavy lifter for use in future space missions in the Augustine Report. The Atlas PH2 HLV would launch a payload mass of approximately 70 metric tons into an orbit of 28.5 degree-inclination.
Each Atlas V booster configuration has a three-digit designation, that indicates the features of that configuration. The first digit shows the diameter (in meters) of the payload fairing, and always has a value of '4' or '5'. The second digit indicates the number of solid rocket boosters attached to the base of the rocket, and can range from '0' through '3' with the 4-meter fairing, and '0' through '5' with the 5-meter fairing. The third digit represents the number of engines on the Centaur stage, either '1' or '2'. As of 2009, only the single-engine Centaur (SEC) has been used, and no launches using a dual-engine Centaur (DEC) are currently planned. For example, an Atlas V 552 has a 5-meter fairing, five solid rocket boosters, and two Centaur engines. An Atlas V 431 has a 4-meter fairing, three solid rocket boosters, and a single Centaur engine.
The 4-meter fairing, originally designed for the Atlas II booster, comes in three different lengths, the original 9-meter high version, as well as fairings 10 meters (first flown on the AV-008/Astra 1KR launch) and 11 meters (seen on the AV-004/Inmarsat-4 F1 launch) high. Lockheed Martin had the 5.4-meter (4.57 meters usable) payload fairing for the Atlas V developed and built by RUAG Space (former Oerlikon Space[full citation needed]) in Switzerland.[not in citation given] The RUAG fairing uses carbon fiber composite construction, based on flight proven hardware from the Ariane 5. Three configurations will be manufactured to support Atlas V. The short (10-meter long) and medium (13-meter long) configurations will be used on the Atlas V 500 series. The 16-meter long configuration will be used on the Atlas V-Heavy. The classic fairing covers only the payload, leaving the Centaur stage exposed to open air. The RUAG fairing encloses the Centaur stage as well as the payload.
Versions: List Date: March 20, 2013. Mass to LEO numbers are at an inclination of 28.5 degrees.
|Version||Fairing||CCBs||SRBs||Upper stage||Payload to LEO||Payload to GTO||Launches to date|
|401||4 m||1||–||SEC||9,797 kg||4,750 kg||18|
|402||4 m||1||–||DEC||12,500 kg||–||0|
|411||4 m||1||1||SEC||12,150 kg||5,950 kg||3|
|421||4 m||1||2||SEC||14,067 kg||6,890 kg||3|
|431||4 m||1||3||SEC||15,718 kg||7,700 kg||2|
|501||5.4 m||1||–||SEC||8,123 kg||3,775 kg||4|
|511||5.4 m||1||1||SEC||10,986 kg||5,250 kg||0|
|521||5.4 m||1||2||SEC||13,490 kg||6,475 kg||2|
|531||5.4 m||1||3||SEC||15,575 kg||7,475 kg||2|
|541||5.4 m||1||4||SEC||17,443 kg||8,290 kg||1|
|551||5.4 m||1||5||SEC||18,814 kg||8,900 kg||3|
|552||5.4 m||1||5||DEC||20,520 kg||–||0|
|Heavy (HLV/5H1)||5.4 m||3||–||SEC||–||–||0|
|Heavy (HLV DEC/5H2)||5.4 m||3||–||DEC||29,400 kg||–||0|
Atlas V launches 
List Date: May 15, 2013
|#||Date and time(UTC)||Type||Serial no.||Launch site||Payload||Type of payload||Orbit||Outcome||Remarks|
|1||August 21, 2002, 22:05||401||AV-001||CCAFS SLC-41||Hot Bird 6||Commercial communications satellite||GSO||Success ||First Atlas V launch|
|2||May 13, 2003, 22:10||401||AV-002||CCAFS SLC-41||Hellas Sat 2||Commercial communications satellite||GSO||Success ||First satellite for Greece and Cyprus|
|3||July 17, 2003, 23:45||521||AV-003||CCAFS SLC-41||Rainbow 1||Commercial communications satellite||GSO||Success ||First Atlas V 500 launch
First Atlas V launch with SRBs
|4||December 17, 2004, 12:07||521||AV-005||CCAFS SLC-41||AMC 16||Commercial communications satellite||GSO||Success|
|5||March 11, 2005, 21:42||431||AV-004||CCAFS SLC-41||Inmarsat 4-F1||Commercial communications satellite||GSO||Success ||First Atlas V 400 launch with SRBs|
|6||August 12, 2005, 11:43||401||AV-007||CCAFS SLC-41||Mars Reconnaissance Orbiter||Mars orbiter||Areocentric||Success||First Atlas V launch for NASA|
|7||January 19, 2006, 19:00||551||AV-010||CCAFS SLC-41||New Horizons||Pluto and Kuiper Belt probe||Hyperbolic||Success||Boeing Star 48B third stage used, first Atlas V launch with a third stage|
|8||April 20, 2006, 20:27||411||AV-008||CCAFS SLC-41||Astra 1KR||Commercial communications satellite||GSO||Success|
|9||March 8, 2007, 03:10||401||AV-013||CCAFS SLC-41||Space Test Program-1||6 military research satellites||LEO||Success|
|10||June 15, 2007, 15:11||401||AV-009||CCAFS SLC-41||USA-194 (NRO L-30/NOSS-4-3A & B)||Two NRO Reconnaissance satellites||LEO||Partial launch failure (Lower than intended orbit) ||First Atlas V flight for the National Reconnaissance Office|
|11||October 11, 2007, 00:22||421||AV-011||CCAFS SLC-41||USA-195 (WGS SV-1)||Military communications satellite||GTO||Success||Valve replacement|
|12||December 10, 2007, 22:05||401||AV-015||CCAFS SLC-41||USA-198 (NRO L-24)||NRO reconnaissance satellite||Molniya||Success|
|13||March 13, 2008, 10:02||411||AV-006||VAFB SLC-3E||USA-200 (NRO L-28)||NRO reconnaissance satellite||Molniya||Success||First Atlas V launch from Vandenberg|
|14||April 14, 2008, 20:12||421||AV-014||CCAFS SLC-41||ICO G1||Commercial communications satellite||GTO||Success|
|15||April 4, 2009, 00:31||421||AV-016||CCAFS SLC-41||USA-204 (WGS SV2)||Military communications satellite||GTO||Success|
|16||June 18, 2009, 21:32||401||AV-020||CCAFS SLC-41||LRO/LCROSS||Lunar exploration||HEO||Success||First Centaur stage to impact on the Moon.|
|17||September 8, 2009, 21:35||401||AV-018||CCAFS SLC-41||USA-207 (PAN)||Military communications satellite||GTO||Success|
|18||October 18, 2009, 16:12||401||AV-017||VAFB SLC-3E||USA-210 (DMSP 5D3-F18)||Military weather satellite||LEO||Success|
|19||November 23, 2009, 06:55||431||AV-024||CCAFS SLC-41||Intelsat 14||Commercial communications satellite||GTO||Success||LMCLS launch|
|20||February 11, 2010, 15:23||401||AV-021||CCAFS SLC-41||SDO||Solar Observatory||GTO||Success|
|21||April 22, 2010, 23:52||501||AV-012||CCAFS SLC-41||USA-212 (X-37B OTV-1)||Military orbital test vehicle||LEO||Success||A piece of the external fairing did not break up on impact, but washed up on Hilton Head Island.|
|22||August 14, 2010, 11:07||531||AV-019||CCAFS SLC-41||USA-214 (AEHF-1)||Military communications satellite||GTO||Success|
|23||September 21, 2010, 04:03||501||AV-025||VAFB SLC-3E||USA-215 (NRO L-41)||NRO reconnaissance satellite||LEO||Success|
|24||March 5, 2011, 22:46||501||AV-026||CCAFS SLC-41||USA-226 (X-37B OTV-2)||Military orbital test vehicle||LEO||Success|
|25||April 15, 2011, 04:24||411||AV-027||VAFB SLC-3E||USA-228 (NRO L-34)||NRO reconnaissance satellite||LEO||Success|
|26||May 7, 2011, 18:10||401||AV-022||CCAFS SLC-41||USA-230 (SBIRS-GEO-1)||Missile Warning satellite||GTO||Success|
|27||August 5, 2011, 16:25||551||AV-029||CCAFS SLC-41||Juno||Jupiter orbiter||Jovicentric||Success|
|28||November 26, 2011, 15:02||541||AV-028||CCAFS SLC-41||Mars Science Laboratory||Mars rover||Hyperbolic||Success||First launch of the 541 configuation
Centaur entered orbit around the sun
|29||February 24, 2012, 22:15||551||AV-030||CCAFS SLC-41||MUOS-1||Military communications satellite||GTO||Success||*200th Centaur launch
|30||May 4, 2012, 18:42||531||AV-031||CCAFS SLC-41||USA-235 (AEHF-2)||Military communications satellite||GTO||Success|
|31||June 20, 2012, 12:28||401||AV-023||CCAFS SLC-41||USA-236 (NROL-38)||NRO reconnaissance satellite||GEO||Success||50th EELV launch|
|32||August 30, 2012, 08:05||401||AV-032||CCAFS SLC-41||Van Allen Probes (RBSP)||Van Allen Belts exploration||HEO||Success|
|33||September 13, 2012, 21:39||401||AV-033||VAFB SLC-3E||USA-238 (NROL-36)||NRO reconnaissance satellites||LEO||Success|
|34||December 11, 2012, 18:03||501||AV-034||CCAFS SLC-41||USA-240 (X-37B OTV-3)||Military orbital test vehicle||LEO||Success|
|35||January 31, 2013, 01:48||401||AV-036||CCAFS SLC-41||TDRS-11 (TDRS-K)||Data relay satellite||GTO||Success|
|36||February 11, 2013, 18:02||401||AV-035||VAFB SLC-3E||Landsat 8||Earth Observation satellite||LEO||Success||First West Coast Atlas V Launch for NASA|
|37||March 19, 2013, 21:21||401||AV-037||CCAFS SLC-41||USA-241 (SBIRS-GEO 2)||Missile Warning satellite||GTO||Success|
|38||May 15, 2013, 21:38||401||AV-039||CCAFS SLC-41||USA-242 (GPS IIF-4)||Navigation satellite||MEO||Success|
List of Atlas launches (2010–2019)
Photo gallery 
X-37B OTV-1 (Orbital Test Vehicle) was the military spaceplane within the April 22, 2010 launch.
See also 
|Wikinews has related news: NASA launches two space probes to the moon|
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- Space Home. RUAG. Retrieved on 2011-11-19.
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- Atlas V Mission Planner's Guide – March 2010. (PDF) . Retrieved on 2011-11-19.
- "2010 U.S. Commercial Space Transportation Developments and Concepts: Vehicles, Technologies, and Spaceports". Federal Aviation Administration. 2010-01. Retrieved 2011-11-26.
- "Inaugural Atlas V Scores Success for ILS, Lockheed Martin". International Launch Services. August 21, 2002. Retrieved 2013-02-28.
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- "ILS Launches Rainbow 1 Satellite". International Launch Services. July 17, 2003. Retrieved 2013-02-28.
- "ILS Launches AMC-16; Wraps Up Year With 10 Mission Successes". International Launch Services. December 17, 2004.
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- "NASA's Multipurpose Mars Mission Successfully Launched". NASA. 2005-08-12. Retrieved 2011-12-04.
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- "ILS Launches ASTRA 1KR Satellite". International Launch Services. April 20, 2006.
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- "United Launch Alliance Inaugural Atlas V West Coast Launch a Success". United Launch Alliance. March 13, 2008.
- "United Launch Alliance Launches Heaviest Commercial Satellite for Atlas V". United Launch Alliance. April 14, 2008.
- "United Launch Alliance Atlas V Successfully Launches AF WGS-2 Satellite". United Launch Alliance. April 3, 2009.
- "United Launch Alliance Successfully Launches Moon Mission for NASA". United Launch Alliance. June 18, 2009.
- "Clues about mystery payload emerge soon after launch". Spaceflight Now. September 8, 2009.
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- :::: United Launch Alliance, LLC ::::
- Spaceflight Now | Atlas Launch Report | Mission Status Center
- :::: United Launch Alliance, LLC ::::
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