Soyuz-2

Soyuz-2
source
Name	Soyuz-2
Caption	A Soyuz-ST variant launching from the Guiana Space Centre.
Function	Medium-lift launch vehicle
Manufacturer	Progress Rocket Space Centre
Country origin	Russia
Height	46.3 m (Soyuz-2.1a/b)
Diameter	2.95 m (core)
Mass	312,000 kg (Soyuz-2.1a)
Stages	2 or 3
Status	Active
Sites	Baikonur Cosmodrome, Vostochny Cosmodrome, Plesetsk Cosmodrome, Guiana Space Centre
Launches	150+ (as of 2024)
Success	140+
First	8 November 2004 (Soyuz-2.1a)
Payload	LEO: 7,800–8,200 kg, SSO: 4,500–4,900 kg
Family	Soyuz
Derivatives	Soyuz-2-1v, Soyuz-5

Soyuz-2. It is a modernized version of the venerable Soyuz launch vehicle, representing a significant technological leap from its R-7-derived predecessors. Developed by the Progress Rocket Space Centre in Samara, the rocket family was designed to improve reliability, payload capacity, and operational flexibility. Its introduction marked a key transition for the Russian space program, enabling continued access to space for both government and commercial payloads from multiple global launch sites.

Development and design

The development of the Soyuz-2 was initiated in the 1990s by the Russian Federal Space Agency (now Roscosmos) to create a more capable and digitally controlled successor to the Soyuz-U and Soyuz-FG rockets. Primary design goals included replacing the vehicle's analog control system with a modern digital system, upgrading the RD-108 and RD-107 engines on its core and booster stages for improved performance, and modifying the structure to accommodate larger payload fairings. A major redesign involved the third stage, where the old RD-0110 engine was replaced with the new RD-0124 on the more powerful Soyuz-2.1b variant. These changes were overseen by key aerospace enterprises like Energia and TsSKB-Progress, ensuring compatibility with existing Baikonur Cosmodrome infrastructure while preparing for new spaceports like Vostochny Cosmodrome.

Launch history and variants

The Soyuz-2 family made its maiden flight on 8 November 2004 with a Soyuz-2.1a test launch from the Plesetsk Cosmodrome. Operational variants include the baseline Soyuz-2.1a, the enhanced Soyuz-2.1b with its more efficient upper stage, and the stripped-down Soyuz-2-1v light-lift vehicle which uses an NK-33 engine on its first stage. A significant evolution was the creation of the Soyuz-ST for launches from the Guiana Space Centre under the auspices of Arianespace, featuring a Fregat upper stage and a modified flight control system. Major milestones include its first crewed mission launching the Soyuz MS-14 spacecraft in 2019 and numerous missions deploying satellites for constellations like OneWeb and for agencies including the European Space Agency.

Technical specifications

The Soyuz-2.1a and 2.1b stand approximately 46.3 meters tall, with a core diameter of 2.95 meters and a launch mass around 312,000 kilograms. The first stage consists of four strap-on boosters, each powered by an RD-107A engine, surrounding a central core powered by an RD-108A engine. The second stage uses an RD-0110 or RD-0124 engine, the latter providing a significant specific impulse increase. The vehicle can be topped with several upper stages, most commonly the Fregat or the Volga, and can be fitted with multiple payload fairings, including the modernized "ST-type" fairing used at the Guiana Space Centre. Its digital control system allows in-flight trajectory adjustments and enables launches to a wider range of orbits, including Sun-synchronous orbit and Geostationary transfer orbit.

Operational use and missions

Soyuz-2 rockets are operated from four major spaceports: Baikonur Cosmodrome in Kazakhstan, Plesetsk Cosmodrome for high-latitude government missions, the new Vostochny Cosmodrome in the Russian Far East, and the Guiana Space Centre for equatorial launches. It serves as the primary workhorse for the Russian space program, launching critical missions such as Progress cargo resupply flights to the International Space Station, GLONASS navigation satellites, and a vast array of Earth observation and scientific spacecraft. Internationally, it has launched major missions for the European Space Agency like the Sentinel satellites and commercial payloads for companies such as OneWeb and Planet Labs.

Significance and legacy

The Soyuz-2 represents a crucial modernization of one of the world's most reliable and frequently launched rocket families, ensuring Russia's continued independent access to space. Its development bridged the legacy of the Soviet space program with 21st-century technological demands, directly supporting the operational lifecycle of the International Space Station. The vehicle's adaptation for the Guiana Space Centre cemented a strategic partnership with Arianespace and European Space Agency, giving it a key role in the global commercial launch market. As the direct predecessor to the forthcoming Soyuz-5 (Irtysh) rocket, the Soyuz-2's design and operational experience form the foundation for the next generation of Russian launch vehicles.

Category:Launch vehicles Category:Soyuz programme Category:Spacecraft introduced in 2004