Soyuz-2

📷 Bill Ingalls / Wikimedia Commons (Public domain)

Soyuz-2 is the modern version of the most-flown rocket family in history. Built by the Progress Rocket Space Centre in Samara, Russia, it is a direct descendant of the R-7 — the world’s first intercontinental ballistic missile, which launched Sputnik in 1957 and Yuri Gagarin in 1961. Soyuz-2 stands 46.3 m tall, lifts about 8,200 kg to low Earth orbit, and has flown more than 150 times since 2004.

It is Russia’s workhorse: it carries cosmonauts and astronauts to the International Space Station aboard Soyuz spacecraft, sends up Progress cargo ships, orbits military and navigation satellites, and for a decade even flew commercially for Western customers.

Development History

By the 1990s the venerable Soyuz-U was still flying with analog electronics little changed since the 1960s. Soyuz-2 replaced all that with digital flight control, enabling bigger fairings, more accurate orbits and new trajectories. The first version, Soyuz-2.1a, made a suborbital test flight on 8 November 2004 and delivered its first satellite — Europe’s MetOp-A weather spacecraft — to orbit in October 2006.

The 2.1b variant added the new RD-0124 third-stage engine with markedly better efficiency, while the light 2.1v version dropped the four strap-on boosters entirely for small payloads. From 2011 to 2022 a variant called Soyuz-ST flew commercially from Europe’s spaceport in French Guiana under Arianespace — an arrangement that collapsed after Russia’s 2022 invasion of Ukraine ended most space cooperation with the West. More than two dozen Soyuz missions flew from South America in that decade, orbiting Galileo navigation satellites among other European payloads.

In April 2016 a Soyuz-2 inaugurated Vostochny, Russia’s new far-eastern cosmodrome, and in April 2020 the Soyuz MS-16 crew became the first people to ride a Soyuz-2.1a, following the retirement of the older Soyuz-FG.

Design & Capabilities

The layout is pure R-7: four tapered liquid-fueled boosters clustered around a core stage, all burning kerosene and liquid oxygen, with every engine ignited on the pad before release. About two minutes up, the four boosters fall away simultaneously in a spinning pattern nicknamed the Korolev cross, after chief designer Sergei Korolev. A third stage completes the climb to orbit, and an optional Fregat upper stage can restart repeatedly to deliver payloads to high orbits or Earth escape.

Liftoff thrust is about 4,100 kN from the RD-107A booster engines and the RD-108A core engine — modernized versions of designs first flown in the 1950s. Depending on the variant and launch site, it can loft roughly 7,000 to 8,200 kg into low orbit, or about 3,250 kg toward geostationary transfer orbit with Fregat’s help. Soyuz-2 launches from Baikonur in Kazakhstan, Plesetsk in northern Russia and Vostochny, and it stands on one of the deepest statistical records in spaceflight, with nearly 2,000 flights of the R-7 family before it.

Notable Missions

Soyuz-2 handles every Russian crew and cargo flight to the International Space Station today: Soyuz MS capsules carrying three people, and uncrewed Progress freighters several times a year. Between 2020 and 2022 it also launched hundreds of OneWeb internet satellites, dozens at a time, from three different spaceports.

In August 2023 a Soyuz-2.1b launched Luna-25, Russia’s first Moon lander since 1976; the rocket performed flawlessly, though the probe later crashed during its descent to the lunar surface. Routine flights orbit Glonass navigation satellites, weather satellites and military payloads.

Frequently Asked Questions

How is Soyuz-2 related to the rocket that launched Sputnik?

Directly. It keeps the same basic R-7 layout from 1957 — a core stage surrounded by four boosters, burning kerosene and liquid oxygen — continuously modernized for seven decades with new engines and digital controls. Counting all variants, the R-7 family has flown nearly 2,000 times, far more than any other rocket family.

What is the Korolev cross?

About two minutes into flight, the four strap-on boosters shut down and peel away from the core simultaneously, tumbling outward in a cross-shaped pattern visible from the ground. The effect is named after Sergei Korolev, the Soviet chief designer, and it has been the signature of every R-7 family launch since 1957.

Does Soyuz-2 launch people?

Yes. Since Soyuz MS-16 in April 2020, every crewed Soyuz spacecraft has flown on a Soyuz-2.1a topped with a launch-escape tower; before that, crews rode the older Soyuz-FG. The wider family has been carrying humans since Gagarin’s Vostok flight in 1961, an unbroken lineage of crewed launches.

What is the Fregat upper stage?

Fregat is an autonomous space tug that rides atop Soyuz-2 and can reignite many times over several hours. It delivers payloads to precise high orbits — Glonass and Galileo navigation satellites, OneWeb batches — or onto escape trajectories, using its own guidance system and long-storable propellants independent of the rocket below.