Soyuz at the Guiana Space Centre

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N₂O₄ / UDMH

Soyuz-ST-A / ST-B

Inaugural launch on 21 October 2011
Function	Medium-lift launch vehicle
Manufacturer	RKTs Progress
Country of origin	Russia
Cost per launch	US$80 million [1]
Size
Height	46.2 m (151 ft 7 in)
Diameter	10.3 m (33 ft 10 in)
Mass	308,000 kg (679,000 lb)
Stages	4
Capacity
Payload to SSO [a]
Mass	A: 4,230 kg (9,330 lb) B: 4,900 kg (10,800 lb) [2]
Launch history
Status	Retired
Launch sites	Guiana Space Centre, ELS
Total launches	27
Success(es)	26
Partial failure(s)	1
First flight	21 October 2011 [4]
Last flight	10 February 2022
Type of passengers/cargo	CSO Galileo O3b OneWeb Pléiades
Boosters (First stage) – Block B, V, G & D [d]
No. boosters	4
Height	19.6 m (64 ft)
Diameter	2.68 m (8 ft 10 in)
Empty mass	3,784 kg (8,342 lb)
Gross mass	44,413 kg (97,914 lb)
Propellant mass	39,160 kg (86,330 lb)
Powered by	1 × RD-107A
Maximum thrust	SL: 839.48 kN (188,720 lbf) vac: 1,019.93 kN (229,290 lbf)
Specific impulse	SL: 263.3 s (2.582 km/s) vac: 320.2 s (3.140 km/s)
Burn time	118 seconds
Propellant	LOX / RP-1

The Soyuz-ST-A and ST-B were modified versions of the Soyuz-2 rocket, designed to launch from the Guiana Space Centre (CSG) in French Guiana. Developed as part of a European Space Agency (ESA) programme to add a medium-lift launch vehicle to complement the light-lift Vega and heavy-lift Ariane 5 rockets. ^[6]

A collaborative effort between Russia and Europe, the project involved constructing the Ensemble de Lancement Soyouz (ELS; lit. 'Soyuz Launch Complex') at the CSG and adapting the Soyuz 2 to the tropical climate. The first launch of a Soyuz ST-B occurred on 21 October 2011, while the first ST-A launch occurred on 17 December 2011.

The Soyuz-ST-A and ST-B were four-stage rockets designed for low Earth orbit missions. Notably, their stage numbering differs from that of some rockets, with the boosters considered the first stage and the central core the second. Unlike the standard Soyuz-2, the Fregat upper stage was mandatory for the ST variants.

Between 2011 and 2022, 27 Soyuz-ST rockets were launched from the CSG, with 26 successful missions. Most of these launches utilized the more powerful ST-B variant, while nine employed the ST-A.

However, the Russia's invasion of Ukraine in 2022 created diplomatic tensions between Russia and Europe, ending Soyuz launches from the CSG. Additionally, the introduction of the Vega C and Ariane 6 launchers, both offering medium-lift capabilities, rendered the role of Soyuz largely redundant.

Soyuz modifications for the Guiana Space Centre

To accommodate the conditions and requirements of the 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

• Mobile Service Tower: Unlike other Soyuz launch complexes, the ELS employed a mobile service tower that enabled vertical payload integration directly on the launchpad. ^[7]
• European Payload Adapters: Launch vehicles used European-supplied payload adapters, enhancing compatibility with a broader range of spacecraft. ^[7]
• 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. ^[8]

Enhanced Safety Systems

• 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. ^{[7] [8]}
• 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. ^[8]
• 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. ^[7]

Environmental Adaptation

• 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. ^[7]
• 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. ^[8]

Vehicle processing

Soyuz rockets arrive at the CSG by ship, where components are offloaded and stored for assembly. In preparation for launch, these components are transferred to the temperature-controlled Launch Vehicle Integration (LVI) Building. Here, in a horizontal orientation, the four strap-on boosters are attached to the core stage, followed by the third stage. Several days before launch, a dedicated transporter moves the assembled Soyuz stages from the LVI Building to the launchpad. At the pad, the launch vehicle is erected into a vertical position, and the mobile service tower is moved into place.

Concurrently, within the Payload Processing Facility (PPF) clean room, customer teams prepare their spacecraft. The day before leaving the PPF, the spacecraft is integrated with an adapter/dispenser. This assembly is then transferred to the S3B building, where the fueled Fregat upper stage awaits. Here, the spacecraft and Fregat are integrated and encapsulated within the payload fairing.

Everything comes together on the third day prior to launch when the mobile service tower lifts the encapsulated spacecraft and Fregat upper stage, positioning them atop the Soyuz launch vehicle. Finally, approximately one hour before launch commences, the mobile service tower is meticulously retracted, readying the Soyuz for its mission. ^{[9] [10] [11] [12] [13]}

Launch history

Inaugural flight

The first contract for the launch of Soyuz the CSG was signed at the 2009 Paris Air Show by the Director of the Galileo Programme and Navigation-related Activities René Oosterlinck and a CEO of Arianespace Jean-Yves Le Gall. This contract covered 2 launches of two Galileo satellites each. ^[14] The contract for the satellites themselves had already been signed by ESA and Galileo Industries in 2006. ^[15]

Launch vehicle components shipped from Saint Petersburg first arrived in French Guiana by ship in November 2009. ^[16] The Soyuz Launch Site acceptance review took place during the last week of March 2011, leading to the first simulated launch campaign between 29 April and 4 May 2011. ^{[17] [18]} The launch site was officially handed over from ESA to the Arianespace on 7 May 2011. ^[19]

Assembly of the Soyuz ST-B begun on 12 September 2011 in the Assembly and Testing building, while two Galileo satellites underwent final tests after their arrival from Thales Alenia Space facilities in Italy on 7 and 14 September 2011. ^[20] The launch was planned for 20 October 2011, however an anomaly was detected in the pneumatic system responsible for disconnecting the fuel lines from Soyuz third stage, forcing the mission to be postponed for 24 hours. On 21 October 2011, at 10:30 UTC, Soyuz ST-B took off for its inaugural, 3 hour 49 minute, flight, ^[21] making it the first time Soyuz was launched outside of the former Soviet Union territory. ^[22]

Flight VS09

On 22 August 2014, Arianespace launched the first two Full Operational Capability satellites for the Galileo satellite navigation constellation into medium Earth orbit. ^[23] The mission appeared to proceed normally and Arianespace reported the launch to be a success, however analysis of telemetry data provided by ESA and CNES tracking stations showed that the satellites were injected into an incorrect orbit. ^[24]

	Orbit	Inclination	Eccentricity
Targeted	23,222 × 23,222 km	55.0°	0.00
Achieved	25,900 × 13,713 km	49.8°	0.23

The orbit was determined by the European Space Operations Centre within 3 hours after the separation from launcher, and the satellites were operating normally and under control. ^[25] Both satellites were switched to safe mode, pointing at the sun while both ESA/CNES and OHB teams investigated the failure and options for the satellites. ^[26]

On 25 August 2014, Arianespace announced the creation of an independent inquiry commission to investigate the anomaly. ^[27] On 28 August 2014, details emerged on the events that most likely led to a failure of the Fregat upper stage. At the end of the re-orientation phase the flight control system detected an incorrect angular speed and unsuccessfully attempted to use thrusters to correct the situation. The flight control system did not detect the thruster issue and continued the flight plan with the upper stage oriented in a wrong direction, leaving the satellites in an incorrect orbit. ^[28]

In late September 2014, the Roscosmos commission report, quoted by Izvestia , indicated that the Fregat failure was due to a design flaw leading to freezing in one of the hydrazine propellant lines, which was placed alongside a line carrying cold helium used for pressurization of the main propellant tanks. During the long first burn required for Galileo orbital insertion the propellant line was cooled to below the freezing point of hydrazine. Further investigations were focused on the software error and a means to prevent similar failures in future. Izvestia also reported that the failure of flight VS09 caused a serious reaction in Russian government. Oleg Ostapenko, head of Roscosmos, had a "difficult conversation in the (Moscow) White House". ^{[29] [30]}

On 7 October 2014, the Independent Inquiry Board announced the conclusions of its investigation, revealing that a proximity of helium and hydrazine feed lines resulted in a thermal bridge that caused an interruption of propellant supply to the thrusters. Ambiguities in the design documents allowing this to happen were a result of not taking into account thermal transfers in the thermal analyses of the stage system design. The Board recommended 3 corrective actions: Revamping thermal analysis, correcting design documents and modification of manufacture, assembly, integration and inspection procedures of the supply lines. ^[31]

In November 2014, ESA announced the satellites would perform a total of 15 orbital maneuvers to raise their perigee to 17,339 km. This would reduce the satellites' exposure to the Van Allen radiation belt, reduce the doppler effect, increase satellite visibility from the ground, and allow the satellites to keep their antennas pointed at Earth during perigee. These orbits would repeat the same ground track every 20 days, allowing synchronization with other Galileo satellites which repeat the same ground track every 10 days. Once in their new orbits the satellites could begin in-orbit testing. ^[32]

Recovery of the satellites concluded in March 2015, when Galileo-FOC FM2 entered a new orbit, mirrored to the orbit of Galileo-FOC FM1, which concluded its manoeuvres on the end of November 2014 and successfully passed testing. Currently satellites overfly the same location on the ground every 20 days, comparing to 10 days of standard Galileo satellites. ^[33]

Missions

Flight	Launch (UTC)	Configuration	Payload	Payload mass	Orbit	Result	Ref.
VS01	21 October 2011, 10:30:00	Soyuz ST-B / Fregat-M	Galileo IOV-1/2	1,580 kg (3,480 lb)	MEO	Success	[4]
VS02	17 December 2011, 02:03:08	Soyuz ST-A / Fregat-M	Pleiades 1, SSOT, 4 x ELISA	2,191 kg (4,830 lb)	SSO	Success	[34]
VS03	12 October 2012, 18:15:01	Soyuz ST-B / Fregat-MT	Galileo IOV-3/4	1,580 kg (3,480 lb)	MEO	Success	[35]
VS04	2 December 2012, 02:02:51	Soyuz ST-A / Fregat	Pléiades 1B	1,070 kg (2,360 lb)	SSO	Success	[36]
VS05	25 June 2013, 19:27:03	Soyuz ST-B / Fregat-MT	O3b F1	3,204 kg (7,064 lb)	MEO	Success	[37]
VS06	19 December 2013, 09:12:19	Soyuz ST-B / Fregat-MT	Gaia	2,105 kg (4,641 lb)	L2	Success	[38]
VS07	3 April 2014, 21:02:26	Soyuz ST-A / Fregat-M	Sentinel-1A	2,272 kg (5,009 lb)	SSO	Success	[39]
VS08	10 July 2014, 18:55:56	Soyuz ST-B / Fregat-MT	O3b F2	3,204 kg (7,064 lb)	MEO	Success	[40]
VS09	22 August 2014, 12:27:11	Soyuz ST-B / Fregat-MT	Galileo FOC FM1/FM2	1,607 kg (3,543 lb)	MEO	Partial failure	[23] [41]
VS10	18 December 2014, 18:37:00	Soyuz ST-B / Fregat-MT	O3b F3	3,184 kg (7,020 lb)	MEO	Success	[42]
VS11	27 March 2015, 21:46:18	Soyuz ST-B / Fregat-MT	Galileo FOC FM3/FM4	1,597 kg (3,521 lb)	MEO	Success	[43]
VS12	12 September 2015, 02:08:10	Soyuz ST-B / Fregat-MT	Galileo FOC FM5/FM6	1,601 kg (3,530 lb)	MEO	Success	[44]
VS13	17 December 2015, 11:51:56	Soyuz ST-B / Fregat-MT	Galileo FOC FM8/FM9	1,603 kg (3,534 lb)	MEO	Success	[45]
VS14	25 April 2016, 21:02:13	Soyuz ST-A / Fregat-M	Sentinel-1B, MICROSCOPE	3,099 kg (6,832 lb)	SSO	Success	[46] [47]
VS15	24 May 2016, 08:48:43	Soyuz ST-B / Fregat-MT	Galileo FOC FM10/FM11	1,599 kg (3,525 lb)	MEO	Success	[48]
VS16	28 January 2017, 01:03:34	Soyuz ST-B / Fregat-MT	Hispasat 36W-1	3,200 kg (7,100 lb)	GTO	Success
VS17	18 May 2017, 11:54:53	Soyuz ST-A / Fregat-M	SES-15	2,302 kg (5,075 lb)	GTO	Success	[49]
VS18	9 March 2018, 14:10:06	Soyuz ST-B / Fregat-MT	O3b F4	3,198 kg (7,050 lb)	MEO	Success	[50]
VS19	7 November 2018, 03:47:27	Soyuz ST-B / Fregat-M	MetOp-C	4,212 kg (9,286 lb)	SSO	Success	[51] [52]
VS20	19 December 2018, 16:37:14	Soyuz ST-A / Fregat-M	CSO-1	3,565 kg (7,859 lb)	SSO	Success	[53]
VS21	27 February 2019, 21:37:00	Soyuz ST-B / Fregat-MT	OneWeb F6	1,945 kg (4,288 lb)	LEO	Success	[54]
VS22	4 April 2019, 17:03:37	Soyuz ST-B / Fregat-MT	O3b F5	3,177 kg (7,004 lb)	MEO	Success
VS23	18 December 2019, 08:54:20	Soyuz ST-A / Fregat-MT	CHEOPS, COSMO-SkyMed	3,250 kg (7,170 lb)	SSO	Success	[55]
VS24	2 December 2020, 01:33:28	Soyuz ST-A / Fregat-M	FalconEye-2	1,190 kg (2,620 lb)	SSO	Success	[56]
VS25	29 December 2020, 16:42:07	Soyuz ST-A / Fregat-M	CSO-2	3,562 kg (7,853 lb)	SSO	Success	[57]
VS26	5 December 2021, 00:19:20	Soyuz ST-B / Fregat-MT	Galileo FOC FM23/FM24	1,645 kg (3,627 lb)	MEO	Success	[58]
VS27	10 February 2022, 18:09:37	Soyuz ST-B / Fregat-MT	OneWeb F13	5,495 kg (12,114 lb)	LEO	Success	[59]

Flights by Mission Result

1

2

3

4

2011

2012

2013

2014

2015

2016

2017

2018

2019

2020

2021

2022

  Success    Failure    Partial Failure  Cancelled  

Soyuz launch statistics from Guiana as of July 2019. Source: data from wikitable Missions, wikitable Scheduled flights and Arianespace website.

Launch sequence

Launch complex with withdrawn mobile gantry

Typically, operations 3 days before launch include countdown rehearsal for all stages as well as final preparations and verification of the Fregat upper stage. Two days before launch preparations for fueling begin. This is also the last day when pre-launch activity with the payload can occur. ^[60] The launch sequence is optimized for each mission, the sequence described here is based on flight VS07 which lifted the Sentinel-1A satellite: ^{[13] [61]}

Clock	Event	Altitude
T− 06:30:00	Mission control team B on a console, beginning of a network countdown
T− 04:50:00	State Commission meeting giving fueling authorization
T− 04:00:00	Beginning of fueling
T− 03:00:00	Payload switched to pre-launch mode
T− 02:20:00	Readiness report
T− 01:45:00	End of fueling
T− 01:21:00	GO / NO-GO roll-call
T− 01:00:00	Mobile gantry withdrawal
T− 00:10:00	Payload switches to onboard power supply
T− 00:06:10	Beginning of autosequence
T− 00:05:00	Fregat switches to onboard power supply
T− 00:01:00	Activation of automatic launch sequence
T− 00:00:40	Launcher switches to onboard power supply
T− 00:00:20	Lower stage umbilical mast withdrawal
T− 00:00:17	Main engine ignition
T− 00:00:15	Preliminary thrust level
T− 00:00:03	Maximum thrust level
T+ 00:00:00	Liftoff
T+ 00:01:11	Max Q
T+ 00:01:58	Boosters separation	60 km (37 mi)
T+ 00:03:29	Fairing separation	120 km (75 mi)
T+ 00:04:47	2nd stage separation	240 km (150 mi)
T+ 00:04:48	2nd stage ignition
T+ 00:04:53	Aft section separation (connects 1st with 2nd stage)
T+ 00:08:46	Fregat upper stage separation
T+ 00:09:46	Fregat ignition	410 km (250 mi)
T+ 00:20:04	Fregat shutdown
T+ 00:23:29	Payload separation	693 km (431 mi)

Notes

1. 820 km (510 mi) SSO with Fregat from Guiana
2. 1,500 m/s (4,900 ft/s) Delta-V deficit GTO with Fregat from Guiana
3. with with Fregat from Guiana
4. This is a transliteration of the second through fifth letters of the Cyrillic alphabet (Б, В, Г, Д). The English translation is Block B, C, D and E.

References

• Spaceflight portal

1. "Surplus Missile Motors: Sale Price Drives Potential Effects on DOD and Commercial Launch Providers". US Government Accountability Office . Retrieved 5 July 2024.
2. "SOYUZ-ST Launch Vehicle / Power Characteristics". Progress State Research and Production Rocket Space Center. Retrieved 20 August 2015.
3. "The Soyuz-2 rocket series". Russianspaceweb.
4. "A Historic Launch For Arianespace: First Soyuz Mission From Guiana Space Center A Success; First Two Galileo Satellites In Orbit" (Press release). Arianespace. 21 October 2011. Retrieved 17 December 2015.
5. Конструкция разгонного блока "Фрегат" (in Russian). NPO Lavochkin. Archived from the original on 26 December 2015. Retrieved 10 March 2016.
6. "Arianespace takes official delivery from ESA of the Soyuz launch complex at the Guiana Space Center" (Press release). Arianespace. 7 May 2011. Archived from the original on 7 July 2011. Retrieved 24 August 2014.
7. "Soyuz from the Guiana Space Centre – User's manual" (PDF). Arianespace. March 2012. p. 43. Retrieved 16 December 2015.
8. Zak, Anatoly (23 August 2015). "Soyuz-2 launch vehicle (14A14)". RussianSpaceWeb. Retrieved 24 August 2015.
9. Arianespace (10 July 2014). "[Soyuz] Processing Highlights of Soyuz VS-08 Mission with O3b Satellites". YouTube . Retrieved 24 August 2014.
10. "Soyuz launch site; Preparation area". Arianespace. Archived from the original on 16 August 2014. Retrieved 25 August 2014.
11. "Soyuz is in the launch zone for its August 21 mission to loft the first two Galileo FOC satellites". Arianespace. 18 August 2014. Retrieved 16 December 2015.
12. "Inspecting the Soyuz facilities". ESA. 24 September 2014. Retrieved 25 August 2014.
13. Daniel Scuka (3 April 2014). "Sentinel-1A launch timeline". ESA. Retrieved 19 August 2014.
14. "Galileo IOV launch services contract signed". ESA. 16 June 2009. Retrieved 23 August 2014.
15. "Galileo program implementation begins". Thales Group. 19 January 2006. Retrieved 23 August 2014.
16. "Shipment of first two Soyuz to French Guiana readies Arianespace for the growth of its launch vehicle family". Arianespace. 7 November 2009. Archived from the original on 8 November 2013. Retrieved 23 August 2014.
17. "Soyuz launch site ready for first flight". ESA. 1 April 2011. Retrieved 23 August 2014.
18. "First Soyuz almost ready for launch from French Guiana". ESA. 4 May 2011. Retrieved 23 August 2014.
19. "ESA hands over keys to Soyuz launch site". ESA. 7 May 2011. Retrieved 23 August 2014.
20. "Countdown to Europe's first Soyuz launch under way". ESA. 20 September 2011. Retrieved 23 August 2014.
21. "A new countdown for Soyuz first flight from the Spaceport". Arianespace. 20 October 2011. Archived from the original on 23 December 2011. Retrieved 23 August 2014.
22. "Soyuz rocket prepares for first launch from French Guiana". The Guardian. 19 October 2011. Retrieved 23 August 2014.
23. "First two operational satellites in the Galileo constellation (Galileo FOC M1, SAT 5–6), the European Union's flagship program, successfully launched by Arianespace (VS 09 – Soyuz)" (Press release). 22 August 2014. Retrieved 16 December 2015.
24. "Galileo satellites experience orbital injection anomaly on Soyuz launch: Initial report" (Press release). 23 August 2014. Retrieved 16 December 2015.
25. "Team of teams". ESA. 8 September 2014. Retrieved 18 September 2014.
26. "Update on Galileo launch injection anomaly". 26 August 2014. Retrieved 27 August 2014.
27. "VS09 flight: Arianespace names independent inquiry commission" (Press release). 25 August 2014. Retrieved 16 December 2015.
28. Anatoly Zak; George Chambers (30 August 2014). "Galileo network: Complex failure scenario emerges". RussianSpaceWeb. Retrieved 3 September 2014.
29. "Frozen Propellant Line found to be Cause of Galileo Launch Failure". Spaceflight101. 26 September 2014. Archived from the original on 6 October 2014. Retrieved 2 October 2014.
30. Иван Чеберко (19 September 2014). "В падении "Союз-СТ-Б" обвинили конструкторов НПО имени Лавочкина" [Lavochkin designers accused for a failure of "Soyuz-ST-B"]. Izvestia (in Russian). Retrieved 2 October 2014.
31. "Soyuz Flight VS09: Independent Inquiry Board announces definitive conclusions concerning the Fregat upper stage anomaly" (Press release). Evry: Arianespace. 8 October 2014. Retrieved 16 December 2015.
32. "Galileo satellite set for new orbit". SpaceRef. 10 November 2014. Retrieved 10 November 2014.
33. "Sixth Galileo satellite reaches corrected orbit". ESA. 13 March 2015. Archived from the original on 23 April 2016. Retrieved 23 July 2015.
34. "Arianespace VSO2 mission: Soyuz STA orbits Pleiades 1A, ELISA and SSOT" (Press release). 17 December 2011. Retrieved 16 December 2015.
35. "Arianespace flight VS03: Soyuz ST-B orbits two Galileo IOV-2 satellites" (Press release). 12 October 2012. Retrieved 16 December 2015.
36. "Arianespace's fourth Soyuz mission a success: Pléiades 1B in orbit" (Press release). 1 December 2012. Retrieved 16 December 2015.
37. "Arianespace launch VS05 > Soyuz ST-B – O3b: Mission accomplished!" (Press release). 25 June 2013. Retrieved 16 December 2015.
38. "Arianespace successfully launches the Gaia scientific satellite" (Press release). 19 December 2013. Retrieved 16 December 2015.
39. "Arianespace boosts Sentinel-1A Earth observation satellite into orbit" (Press release). 3 April 2014. Retrieved 16 December 2015.
40. "Arianespace launches O3b satellites on Soyuz mission" (Press release). 10 July 2014. Retrieved 16 December 2015.
41. "VS09 Soyuz launch: Galileo satellites orbital injection anomaly" (Press release). Arianespace. 22 August 2014. Retrieved 16 December 2015.
42. "Arianespace launch a success, orbiting four more satellites in the O3b constellation" (Press release). 18 December 2014. Retrieved 16 December 2015.
43. "Arianespace expands Europe's Galileo global navigation satellite system with its latest Soyuz success" (Press release). 27 March 2015. Retrieved 16 December 2015.
44. "Arianespace successfully launches two satellites in the Galileo constellation" (Press release). Arianespace. 27 March 2015. Retrieved 16 December 2015.
45. "Arianespace's Latest Galileo Mission A Success: Soyuz Launcher Orbits Two More Satellites In The Constellation" (Press release). 17 December 2015. Retrieved 17 December 2015.
46. "Flight VS14 – A successful Arianespace launch with Soyuz, supporting sustainable development, fundamental physics and promoting space careers" (Press release). Arianespace. 25 April 2016.
47. "Sentinel-1". European Space Agency. Retrieved 23 January 2016.
48. "Arianespace orbits two more Galileo satellites" (Press release). Arianespace. 24 May 2016.
49. "The 40th SES satellite orbited by Arianespace is lofted on its latest Soyuz mission success". Arianespace. Retrieved 18 May 2017.
50. "Mission Description". Arianespace. Retrieved 9 March 2018.
51. "Mission Description". Arianespace. Retrieved 7 November 2018.
52. Krebs, Gunter. "METOP A, B, C". Gunter's Space Page. Retrieved 8 April 2017.
53. "Soyuz Flight VS20 - Arianespace". Arianespace. Retrieved 23 February 2019.
54. "Soyuz Flight VS21". Arianespace. Retrieved 21 March 2019.
55. Clark, Stephen (7 April 2017). "Italian radar satellite, European exoplanet telescope to launch on Soyuz next year". Spaceflight Now. Retrieved 8 April 2017.
56. "Live coverage: Soyuz launches Falcon Eye 2 satellite on third attempt". Spaceflight Now. 1 December 2020. Retrieved 2 December 2020.
57. "Arianespace, with Russian Soyuz, launches CSO-2 French military satellite". NASASpaceflight. 29 December 2020. Retrieved 29 December 2020.
58. Zak, Anatoly (4 December 2021). "Soyuz delivers a pair of Galileo satellites". RussianSpaceWeb. Retrieved 5 December 2021.
59. "Arianespace's thirteenth flight for OneWeb successfully deployed 34 additional satellites". Arianespace (Press release). 10 February 2022. Retrieved 11 February 2022.
60. "Soyuz Launch operations". Arianespace. Archived from the original on 2 May 2014. Retrieved 19 August 2014.
61. Stephen Clark (4 April 2014). "Mission Status Center – Soyuz Launch Report". Spaceflight Now. Retrieved 19 August 2014.

External links

• European Space Agency about Soyuz-ST (Russian name Soyuz-STK)