Atlas V Rocket

Atlas V is a significant expendable launch system developed and operated by United Launch Alliance (ULA), based in the United States, and has been used since the early 21st century in a variety of satellite missions and space exploration endeavors. This rocket is a member of the Atlas rocket family developed by Lockheed Martin and was specifically designed with reliability and flexibility as key priorities.

Atlas V under spotlights before the Perseverance Rover launch (NASA)

Development Process and Historical Background

Atlas V originated as part of the Evolved Expendable Launch Vehicle (EELV) program developed by Lockheed Martin in the late 1990s. This program aimed to replace aging launch systems with cost-effective, modular rockets for the United States Air Force.

Atlas V on Launch Pad 41 with GOES-R (NASA)

Its first launch was conducted on 21 August 2002, after which it was employed in numerous civil, military, and scientific missions. In 2006, Lockheed Martin’s Atlas V program merged with Boeing’s Delta IV program to form ULA. Since then, Atlas V has continued to operate under ULA’s umbrella.

Technical Specifications

Structure and Configurations

Atlas V features a modular design and can be launched in various configurations to meet different mission requirements. Its naming convention typically follows the format “Atlas V XYZ”:

• X: Indicates the diameter of the core stage, usually 4 or 5 meters.
• Y: Specifies the number of solid rocket boosters, ranging from 0 to 5.
• Z: Denotes the number of Centaur upper stage engines, typically 1 or 2.

First Stage (Common Core Booster)

• Height: Approximately 32.5 meters
• Diameter: 3.81 meters
• Engine: RD-180, a dual-chamber liquid-fueled engine
• Fuel Type: RP-1 (refined kerosene) and liquid oxygen (LOX)
• Thrust: Approximately 3.83 MN (megaNewtons)

The RD-180 engine is manufactured by NPO Energomash in Russia and provides Atlas V with high-efficiency propulsion.

Second Stage (Centaur Upper Stage)

• Engine: Single or dual RL10C engines
• Fuel Type: Liquid hydrogen (LH2) and liquid oxygen (LOX)
• Thrust: Approximately 100–200 kN
• Relight Capability: Capable of multiple ignitions depending on mission profile.

Payload Fairing

Payload fairings are produced in different diameters (4 meters or 5 meters). The 5-meter version is preferred for larger satellites or missions requiring multiple payloads.

Mission Profiles and Applications

Military Applications

Atlas V has been used for numerous security missions conducted by the United States Department of Defense. These missions have typically involved launching classified satellites for the National Reconnaissance Office (NRO), communication satellites, and missile early warning systems.

Civil and Scientific Applications

NASA has employed Atlas V in many scientific missions, including:

• Mars Science Laboratory (MSL): The Curiosity rover, launched in 2011, was delivered to Mars using the Atlas V 541 configuration.
• Landsat 8: An Earth observation satellite.
• Solar Orbiter: A scientific mission to study the Sun’s polar regions.

Commercial Missions

ULA has also used Atlas V to launch communication and navigation satellites for various commercial customers. It has been particularly favored for its capability to place satellites into geosynchronous orbit (GEO).

Performance Capacity

Atlas V’s payload capacity varies depending on the configuration used. Some representative values include:

• Low Earth Orbit (LEO): 9,800–18,850 kg
• Geostationary Transfer Orbit (GTO): 4,750–8,900 kg
• Mars Transfer Orbit: Approximately 3,800 kg

These figures demonstrate Atlas V’s adaptability to a wide range of mission types.

Reliability and Operational Success

As of 2025, Atlas V has completed over 90 launches, with the vast majority successfully accomplished. Its launch success rate exceeds 98 percent, a figure widely regarded as a benchmark for high reliability among modern launch systems.

AI-generated visualization of an Atlas V liftoff.

The Future of Atlas V

In the 2020s, ULA developed the next-generation Vulcan Centaur rocket to replace Atlas V. Due to the Russian origin of the RD-180 engines, the U.S. government plans to retire Atlas V in the medium term. Vulcan is designed with lower costs and domestically produced components, aiming to assume Atlas V’s mission portfolio.

Atlas V has successfully served a wide array of space missions for over two decades, distinguished by its high reliability and modular design. It has played a vital role in both defense and scientific missions and is now preparing to be succeeded by next-generation rocket technologies. Nevertheless, it has left a lasting legacy in the history of space exploration as a long-lasting and strategic launch vehicle.