is launched). The second digit indicates the number of solid rocket boosters (SRBs) attached to the base of the launch vehicle and can range from "0" through "3" with the fairing, and "0" through "5" with the fairing. As seen in the first image, all SRB layouts are asymmetrical. The third digit represents the number of engines on the Centaur stage, either "1" or "2". For example, an Atlas V 551 has a 5-meter fairing, 5 SRBs, and 1 Centaur engine, whereas an Atlas V 431 has a 4-meter fairing, 3 SRBs, and 1 Centaur engine. The Atlas V N22 with no fairing, two SRBs, and 2 Centaur engines was first launched in 2019. The flight carried the Starliner vehicle for its first orbital test flight. , all versions of the Atlas V, its design and production rights, and intellectual property rights are owned by ULA and Lockheed Martin. Capabilities List date: 8 August 2019 Mass to LEO numbers are at an inclination of 28.5°. Upper stages SEC – Single Engine Centaur DEC – Dual Engine Centaur Launch system status Launch cost Before 2016, pricing information for Atlas V launches was limited. In 2010, NASA contracted with ULA to launch the MAVEN mission on an Atlas V 401 for approximately US$187 million. The 2013 cost of this configuration for the U.S. Air Force under their block buy of 36 launch vehicles was US$164 million. In 2015, the TDRS-M launch on an Atlas 401 cost NASA US$132.4 million. Starting in 2016, ULA provided pricing for the Atlas V through its RocketBuilder website, advertising a base price for each launch vehicle configuration, which ranges from US$109 million for the 401 up to US$153 million for the 551. Each additional SRB adds an average of US$6.8 million to the cost of the launch vehicle. Customers can also choose to purchase larger payload fairings or additional launch service options. NASA and Air Force launch costs are often higher than equivalent commercial missions due to additional government accounting, analysis, processing, and mission assurance requirements, which can add US$30–80 million to the cost of a launch. In 2013, launch costs for commercial satellites to GTO averaged about US$100 million, significantly lower than historic Atlas V pricing. However, in recent years the price of an Atlas V [401] has dropped from approximately US$180 million to US$109 million, in large part due to competitive pressure that emerged in