Soyuz 2 (Russian: Союз 2, lit.'Union 2') (GRAU index 14A14) is a modernized expendable medium-lift launch vehicle and the seventh major version of the Soyuz rocket family. It includes key enhancements over its predecessors including improved engines along with digital flight control and telemetry systems, enabling launches from fixed platforms and the use of large payload fairings.

Soyuz 2 (2.1a / 2.1b)
A MetOp spacecraft ready for launch atop a Soyuz 2.1a rocket.
FunctionMedium-lift launch vehicle
ManufacturerProgress
Country of originRussia
Cost per launchUS$35−48.5 million (Roscosmos)[1][2]
US$80 million (Arianespace)[3]
Size
Height46.3 m (152 ft)[4]
Diameter10.3 m (33 ft 10 in)
Mass312,000 kg (688,000 lb)
Stages3 or 4
Capacity
Payload to LEO[a]
MassA: 7,020 kg (15,480 lb)
B: 8,200 kg (18,100 lb)[4]
Payload to SSO[b]
MassA: 4,230 kg (9,330 lb)
B: 4,900 kg (10,800 lb)[5]
Payload to GTO[c]
MassA: 2,810 kg (6,190 lb)
B: 3,250 kg (7,170 lb)[5]
Payload to TLI[d]
MassB: 2,350 kg (5,180 lb)[6]
Payload to GSO[e]
MassB: 1,360 kg (3,000 lb)[6]
Associated rockets
FamilyR-7 (Soyuz)
Based onSoyuz-FG
Derivative workSoyuz ST-A/B
Soyuz 2.1v
Launch history
StatusActive
Launch sites
Total launches
  • 170 (+1 suborbital)
  •     A: 79 (+1 suborbital)
  •     B: 91
Success(es)
  • 164 (+1 suborbital)
  •     A: 76 (+1 suborbital)
  •     B: 88
Failure(s)4 (A: 2, B: 2)
Partial failure(s)2 (A: 1, B: 1)
First flight
  • A: 8 November 2004
  • B: 27 December 2006
Last flight
  • A: Active
  • B: Active
Type of passengers/cargo
Boosters (First stage)
No. boosters4
Height19.6 m (64 ft)
Diameter2.68 m (8 ft 10 in)
Empty mass3,784 kg (8,342 lb)
Gross mass44,413 kg (97,914 lb)
Propellant mass39,160 kg (86,330 lb)
Powered by1 × RD-107A
Maximum thrustSL: 839.48 kN (188,720 lbf)
vac: 1,019.93 kN (229,290 lbf)
Specific impulseSL: 263.3 s (2.582 km/s)
vac: 320.2 s (3.140 km/s)
Burn time118 seconds
PropellantLOX / RP-1
Second stage (core)
Height27.10 m (88.9 ft)
Diameter2.95 m (9 ft 8 in)
Empty mass6,545 kg (14,429 lb)
Gross mass99,765 kg (219,944 lb)
Propellant mass90,100 kg (198,600 lb)
Powered by1 × RD-108A
Maximum thrustSL: 792.41 kN (178,140 lbf)
vac: 921.86 kN (207,240 lbf)
Specific impulseSL: 257.7 s (2.527 km/s)
vac: 320.6 s (3.144 km/s)
Burn time286 seconds
PropellantLOX / RP-1
Third stage
Height6.70 m (22.0 ft)
Diameter2.66 m (8 ft 9 in)
Empty mass2,355 kg (5,192 lb)
Gross mass27,755 kg (61,189 lb)
Propellant mass25,400 kg (56,000 lb)
Powered byA: 1 × RD-0110
B: 1 × RD-0124
Maximum thrustA: 298 kN (67,000 lbf)
B: 294.3 kN (66,200 lbf)
Specific impulseA: 326 s (3.20 km/s)
B: 359 s (3.52 km/s)
Burn time270 seconds
PropellantLOX / RP-1
Fourth stage (optional) – Fregat / Fregat-M / Fregat-MT[7]
Height1.5 m (4 ft 11 in)
DiameterFregat / Fregat-M: 3.35 m (11.0 ft)
Fregat-MT: 3.80 m (12.5 ft)
Empty massFregat: 930 kg (2,050 lb)
Fregat-M: 980 kg (2,160 lb)
Fregat-MT: 1,050 kg (2,310 lb)
Propellant massFregat: 5,250 kg (11,570 lb)
Fregat-M: 5,600 kg (12,300 lb)
Fregat-MT: 7,100 kg (15,700 lb)
Powered by1 × S5.92
Maximum thrust19.85 kN (4,460 lbf)
Specific impulse333.2 s (3.268 km/s)
Burn timeUp to 1,100 seconds (up to 20 starts)
PropellantN2O4 / UDMH
Fourth stage (optional) – Volga[8]
Height1.025 m (3 ft 4.4 in)
Diameter3.2 m (10 ft)
Empty mass840 kg (1,850 lb)
Propellant mass300–900 kg (660–1,980 lb)
Powered by1 × 17D64[9]
Maximum thrust2.94 kN (660 lbf)
Specific impulse307 s (3.01 km/s)
PropellantN2O4 / UDMH

In its standard configuration, Soyuz 2 is a three-stage launch vehicle designed for low Earth orbit missions. Notably, its stage numbering differs from some rockets. The boosters are considered to be its first stage, while the central core is the second one. For higher orbits like Molniya or geosynchronous, an optional upper (fourth) stage can be added. The most common upper stage is the Fregat, but the smaller Volga is also an option. These upper stages have their own independent flight control and telemetry systems.

The Soyuz 2 family has two major variants, with the Soyuz 2.1a being the base version that first launched on 8 November 2004. The Soyuz 2.1b, with a 15 percent more powerful third stage, followed on 27 December 2006. In 2011, the Soyuz ST-A and Soyuz ST-B were introduced, derivative versions with extensive modifications to launch from the Guiana Space Centre in French Guiana. Soyuz launches from Guiana were suspended in 2022 after the Russian invasion of Ukraine. The derivative Soyuz 2.1v with a more powerful core stage and no boosters was introduced in December 2013.

The Soyuz 2 rocket utilizes the existing facilities of its R-7 derived predecessors, Site 31 at the Baikonur Cosmodrome in Kazakhstan and Site 43 at the Plesetsk Cosmodrome in northwestern Russia. An additional launch locations opened at Site 1S at the Vostochny Cosmodrome in eastern Russia in 2016.

The Soyuz 2 has replaced the Molniya-M, Soyuz-U and Soyuz-FG rockets since 2010, 2017 and 2019 respectively.[10][11][12]

Variants

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Soyuz 2.1a

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The Soyuz 2.1a incorporates upgraded RD-107A engines in the first stage (the four boosters) and the upgraded RD-108A engine in the second stage (the central core). The engines have improved injection systems to enhance overall performance. The RD-0110 engine remains in use on the third stage.

The 2.1a has a digital flight control system, replacing the analog system used on prior Soyuz models. This system allows the vehicle to adjust its trajectory in-flight (a capability the analog system lacked) eliminating the requirement for a complex rotating launchpad.

The digital flight control system also unlocks the potential for deploying larger commercial satellites housed within wider and longer payload fairings. These fairings introduced too much aerodynamic instability for the old analog system to handle.

The first launch of a Soyuz 2.1a took place from Plesetsk Cosmodrome Site 43 on 8 November 2004 with a boilerplate payload, simulating the size and weight of a Zenit-8 spy satellite. The first launch of a Soyuz ST-A took place from Guiana Space Centre on 17 December 2011 carrying four satellites (including Pléiades-HR 1A, SSOT and ELISA).

Soyuz 2.1b

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The Soyuz 2.1b has all the same features as the Soyuz 2.1a, but uses an upgraded engine (RD-0124) on the third stage, which greatly increases specific impulse (326 to 359 seconds), improving payload capability to LEO from 7,200 kilograms (15,900 lb) to 8,200 kilograms (18,100 lb).

The first launch of a Soyuz 2.1b took place from Plesetsk Cosmodrome Site 43 on 26 July 2008 with a classified military payload.[13] The first launch of a Soyuz ST-B took place from Guiana Space Centre on 21 October 2011 carrying two Galileo satellites.

Modifications for various launch sites

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Guiana Space Centre

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To accommodate the conditions and requirements of the Guiana Space Centre (CSG), Soyuz rockets underwent several key modifications. These adaptations ensure the vehicle's optimal performance and safety within the tropical environment.

Launch Infrastructure and Payload Integration

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  • Mobile Service Tower: Unlike other Soyuz launch complexes, the ELS employed a mobile service tower that enabled vertical payload integration directly on the launchpad.[14]
  • European Payload Adapters: Launch vehicles used European-supplied payload adapters, enhancing compatibility with a broader range of spacecraft.[14]
  • Engine Ignition: At the ELS, the engines of the boosters and first stage were pyrotechnically ignited. At other Soyuz launch complexes, engines are chemically ignited.[15]

Enhanced Safety Systems

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  • European Safeguard Kit (French: Kit de Sauvegarde Européenne): This system can locate the rocket in real-time and, if necessary, transmit a flight termination signal, ensuring the safe destruction of the vehicle in the event of an anomaly.[14][15]
  • Destruct System for Boosters and Core Stage: Boosters and core stage are equipped with pyrotechnic devices to ensure they sink in the ocean for disposal after flight.[15]
  • S-Band Telemetry System Adaptation: The S band telemetry system is modified to operate on the Inter-Range Instrumentation Group standard used at the CSG.[14]

Environmental Adaptation

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  • Tropical Climate Adaptation: The air conditioning system is adapted to keep the payload cool inside the faring, and protective measures are added to reduce icing when loading cryogenic fluids in the humid environment.[14]
  • Pest Control: To avoid potential wildlife intrusions, all cavities and openings within the rocket were studied and certified to be adequately sealed against insects and rodents.[15]

Vostochny Cosmodrome

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Modifications for the Vostochny Cosmodrome version includes:[16]

  • New and upgraded computer, N.A.Semikhatov NPO Automatika's Malachite-7, with six times more performance, better obsolescence protection, reduced weight.[17][18][19]
  • The new computer enabled a significant reduction on the cable network complexity thanks to multiplexing lines and using common buses.[16][19][20]
  • New nickel-cadmium batteries that eliminate the need for a dedicated battery charging station.[17]
  • The inclusion of on-board video system, that will enable real-time views of the launch.[17]
  • Since the launch pad at Vostochny also has a mobile gantry for vertical payload integration, similar to the ELS at Guiana, it has the necessary piping to direct the oxygen purges outside the gantry.[16]

On 1 October 2015, it was announced that parts of the assembly complex for the Soyuz 2 at Vostochny Cosmodrome were designed for a different modification of the rocket and are too small, so that the planned first launch in December 2015 was under question.[21] The first launch occurred on 28 April 2016 at 02:01:21 UTC.[22]

Notable missions

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Suborbital test flight

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On 8 November 2004, at 18:30 UTC, the first Soyuz 2 rocket, in the Soyuz 2.1a configuration, was launched from the Plesetsk Cosmodrome in Russia. The rocket followed a sub-orbital trajectory, with the third stage and Boilerplate landing in the Pacific Ocean.

Maiden launch

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The first attempt at launching a Soyuz 2 to orbit, with the MetOp-A satellite, occurred on 17 July 2006. It was scrubbed two hours before the launch by an automatic sequence, after the onboard computer failed to check the launch azimuth. Fuelling of the rocket was underway at the time, and all launch complex equipment and on-board preliminary checks had proceeded without incident. The rocket was left fuelled on the launch pad, for the next attempt on 18 July 2006. Launch was eventually conducted on 19 October 2006.

First crewed mission

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First crewed launch of Soyuz 2 took place at 9 April 2020, carrying Soyuz MS-16 to the ISS.

Naphthyl fuel

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Following successful ground testing, a naphthyl (Russian: нафтил) fueled Soyuz 2.1b launch took place on 22 October 2022 at Vostochny. Naphthyl is an environmentally safe hydrocarbon fuel with fewer aromatic compounds than kerosene, that also slightly improves engine performance. There are only minor differences in thermal properties, viscosity, and surface tension, so this did not require significant engine changes.[23]

Launch statistics

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Since 2006, Soyuz 2 rockets have accumulated a total of 170 launches, 164 of which were successful, yielding a 96.5% success rate.

Launch outcomes

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5
10
15
20
25
30
2006
2010
2015
2020
  •   Failure
  •   Partial failure
  •   Success
  •   Scheduled

Launch sites

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5
10
15
20
25
30
2006
2010
2015
2020

List of launches

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Planned launches

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Launch date
Time (UTC)
Configuration Spaceport Result Payload Function Remark
27 November 2024 Soyuz 2.1b Plesetsk, Site 43 Planned Kosmos-2580 (Lotos-S1 №8)[164]
30 November 2024[165] Soyuz 2.1a / Fregat-M Vostochny, Site 1S Planned Kondor-FKA No.2 Reconnaissance
Q4 2024 Soyuz 2.1b / Fregat-M Plesetsk, Site 43 Planned GLONASS-K 18 Navigation
2024[166] Soyuz 2.1a / Fregat Plesetsk, Site 43 Planned GLONASS-K2 No.2 (2xx) Navigation
2024[167] Soyuz 2.1a / Fregat Plesetsk, Site 43 Planned Meridian-M 11 (21L) Communications
12 February 2025[168] Soyuz 2.1a Baikonur, Site 31/6 Scheduled Progress MS-30 ISS logistics
17 March 2025[165] Soyuz 2.1b / Fregat-M Vostochny, Site 1S Planned Aist-2T №1
Aist-2T №2
Earth observation
20 March 2025[169] Soyuz 2.1a Baikonur, Site 31 Planned Soyuz MS-27 ISS crew transport
May 2025[168] Soyuz 2.1a Baikonur, Site 31/6 Scheduled Progress MS-31 ISS logistics
August 2025[168] Soyuz 2.1a Baikonur, Site 31/6 Scheduled Progress MS-32 ISS logistics
September 2025[169] Soyuz 2.1a Baikonur, Site 31 Planned Soyuz MS-28 ISS crew transport
October 2025[168] Soyuz 2.1a Baikonur, Site 31/6 Scheduled Progress MS-33 ISS logistics
2025[170] Soyuz 2.1a Plesetsk, Site 43 Planned Obzor-R №1 Earth observation
2025[165] Soyuz 2.1b / Fregat Vostochny, Site 1S Planned Ionosfera-M №3
Ionosfera-M №4
Ionospheric research
2025[171] Soyuz 2.1a / Fregat Vostochny, Site 1S Planned Meteor-M No.2-5 Weather
2025[172] Soyuz 2.1b Baikonur, Site 31/6 Planned Bion-M No.2 Biological science
2025[173] Soyuz 2.1b Baikonur, Site 31 Planned Resurs-P No.5 Earth observation
2025[165] Soyuz 2.1b Vostochny, Site 1S Planned Resurs-PM №1 Earth observation
2025[174][175] Soyuz 2.1a / Fregat Vostochny, Site 1S Planned Kondor-FKA-M No.1 Reconnaissance
2025[171] Soyuz 2.1a / Fregat Vostochny, Site 1S Planned Meteor-M No.2-6 Weather
2025[165] Soyuz 2.1b Vostochny, Site 1S Planned Resurs-PM №2 Earth observation
February 2026[168] Soyuz 2.1a Baikonur, Site 31/6 Scheduled Progress MS-34 ISS logistics
March 2026[169] Soyuz 2.1a Baikonur, Site 31 Planned Soyuz MS-29 ISS crew transport
May 2026[168] Soyuz 2.1a Baikonur, Site 31/6 Scheduled Progress MS-35 ISS logistics
August 2026[168] Soyuz 2.1a Baikonur, Site 31/6 Scheduled Progress MS-36 ISS logistics
September 2026[169] Soyuz 2.1a Baikonur, Site 31 Planned Soyuz MS-30 ISS crew transport
October 2026[168] Soyuz 2.1a Baikonur, Site 31/6 Scheduled Progress MS-37 ISS logistics
2027[176] Soyuz 2.1b / Fregat Vostochny, Site 1S Planned Luna 26 Lunar orbiter
Soyuz 2.1b / Fregat Plesetsk, Site 43 Planned GLONASS-K 19–23 Navigation

See also

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Notes

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  1. ^ 200 km (120 mi) circular LEO 51.8° inclination from Baikonur
  2. ^ 820 km (510 mi) SSO with Fregat from Guiana
  3. ^ 1,500 m/s (4,900 ft/s) Delta-V deficit GTO with Fregat from Guiana
  4. ^ with Fregat from Baikonur
  5. ^ with with Fregat from Guiana

References

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