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Uncrewed spaceflights to the International Space Station

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Clockwise: Progress, H-II Transfer Vehicle, Automated Transfer Vehicle, Enhanced Cygnus, Standard Cygnus, and SpaceX Dragon

Uncrewed spaceflights to the International Space Station (ISS) are made primarily to deliver cargo, however several Russian modules have also docked to the outpost following uncrewed launches. Resupply missions typically use the Russian Progress spacecraft, European Automated Transfer Vehicles, Japanese Kounotori vehicles, and the American Dragon and Cygnus spacecraft. The primary docking system for Progress spacecraft is the automated Kurs system, with the manual TORU system as a backup. ATVs also use Kurs, however they are not equipped with TORU. The other spacecraft — the Japanese HTV, the SpaceX Dragon (under CRS phase 1) and the Northrop Grumman[1] Cygnus — rendezvous with the station before being grappled using Canadarm2 and berthed at the nadir port of the Harmony or Unity module for one to two months. Progress, Cygnus and ATV can remain docked for up to six months.[2][3] Under CRS phase 2, Cargo Dragon docks autonomously at IDA-2 or 3 as the case may be. As of December 2022, Progress spacecraft have flown most of the uncrewed missions to the ISS.

To avoid confusion, this list includes Soyuz MS-23, which was launched uncrewed and landed crewed, but does not include Soyuz MS-22, which was launched crewed and landed uncrewed, which is listed at List of human spaceflights to the International Space Station.

Current and completed spaceflights

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Graphical representation of history of uncrewed flights, divided by year and rocket family.

This is a list of uncrewed spaceflights to the International Space Station.

Key to box background colors:

  •   Module launch
  •   Launch failure, spacecraft did not reach orbit
  •   Partial failure, spacecraft reached orbit but did not rendezvous with ISS

Note: Russia has delivered cargo via the uncrewed missions of Progress since the launch of the ISS, while the U.S. had used Space Shuttles for hybrid human/cargo missions, resulting in a greater number of Russian uncrewed flights to the ISS. Since the discontinuation of the Space Shuttle program in 2011, the numbers of crewed and uncrewed flights by the U.S. and Russia are more closely matched.

^ For vehicles that are berthed to the station using the Space Station Remote Manipulator System (SSRMS) the times of berthing and unberthing are given. For those vehicles whose berthing and unberthing time is not sure is not provided, SSRMS capture and release is taken. This is because these vehicles remain physically attached to the station longer than indicated when counting the time between initial SSRMS capture and release. Formerly, the Japanese HTV and the SpaceX Dragon and currently, the Cygnus are the visiting vehicles to attach in this manner. For all other vehicles the times of docking and undocking are given.

Future spaceflights

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Scheduled future flights are shown below:

Spacecraft ISS flight number Mission Launcher Scheduled date
(UTC)[85][86][87]
SpaceX CRS-31 CRS SpX-31 Logistics Falcon 9 Block 5 September 2024
Progress MS-29 ISS-90P Logistics Soyuz-2.1a November 2024
Cygnus NG-22 CRS NG-22 Logistics Falcon 9 Block 5 2025
SNC Demo-1 ISS-SNC-1 Logistics Vulcan Centaur VC4L 2025
HTV-X1 HTV-X1 Logistics H3-24W 2025
US Deorbit Vehicle ? Deorbit ? 2030

Spaceports

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Baikonur Cosmodrome

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Baikonur Cosmodrome in Kazakhstan is the oldest and busiest spaceport. The first module of the ISS was launched from Baikonur Cosmodrome Site 81 as the uncrewed spacecraft Zarya in 1998 and flew uncrewed for about two years before the first crew arrived. The Progress spacecraft is the most frequent cargo ship sent from Baikonur to the station, bringing supplies such as food, fuel, gas, experiments, and parts. Its light payload is offset by its ability to deliver critical replacement parts at short notice. Fresh fruit and vegetables from the earth are an important part of the crew's diet.

Tanegashima Space Center

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A Kounotori departing Tanegashima Space Center bound for the International Space Station.

Located in Japan on an island 115 kilometres (71 mi) south of Kyūshū, the Tanegashima Space Center (TCS) is the launch site for H-II Transfer Vehicle (HTV), called Kounotori (こうのとり, Oriental stork or white stork), used to resupply the Kibō Japanese Experiment Module (JEM) and the ISS. The name Kounotori was chosen for the HTV by JAXA because "a white stork carries an image of conveying an important thing (a baby, happiness, and other joyful things), therefore, it precisely expresses the HTV's mission to transport essential materials to the ISS".[88]

White Kounotori can carry 6,000 kilograms (13,000 lb) of cargo in total, about 3,500–4,500 kilograms (7,700–9,900 lb) of which is accessible by the crew in the pressurized section, the remainder is unpressurised cargo on Exposed Pallet to be handled by the ISS's robotic arm.[89]

Guiana Space Centre

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The European Space Agency (ESA) uses the Guiana Space Centre near Kourou in French Guiana. Operational since 1968, it is particularly suitable as a location for a spaceport due to its proximity to the equator, and that launches are in a favorable direction over water. The near-equatorial launch location provides an advantage for launches to low-inclination (or geostationary) Earth orbits compared to launches from spaceports at higher latitude, the eastward boost provided by the Earth's rotation is about 463 metres per second (1,520 ft/s; 1,040 mph) at this spaceport.

The ESA's Automated Transfer Vehicle weighs 20,700 kilograms (45,600 lb) at launch and has a cargo capacity of 8,000 kilograms (18,000 lb) including 1,500 to 5,500 kilograms (3,300 to 12,100 lb) of dry cargo, up to 1,000 kilograms (2,200 lb) of gases (water, nitrogen, oxygen, air), with up to two gases per flight, and up to 4,700 kilograms (10,400 lb) of propellant for boosting and refueling the station.

Cape Canaveral Space Force Station

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A SpaceX Dragon cargo launch to ISS aboard a Falcon 9.

Cape Canaveral Space Force Station, located in Florida, United States, has been operational since 1950; with its first orbital launch occurring in 1958. All of NASA's crewed Mercury and Gemini missions were launched from the Cape, along with some of the earlier Apollo missions. Cape Canaveral is adjacent to the Kennedy Space Center, where the majority of Apollo missions and all the Space Shuttle missions were launched from. Under contract with NASA, SpaceX launches the Dragon 2 Cargo variant spacecraft to resupply the American portion of the ISS. The Dragon can transport 6,000 kilograms (13,000 lb) of pressurized and unpressurized cargo and can return 3,000 kilograms (6,600 lb) to Earth. It is the only uncrewed resupply vehicle capable of returning a payload.

Mid-Atlantic Regional Spaceport

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The Mid-Atlantic Regional Spaceport, located at Wallops Island, Virginia, United States, is the launch site for the Northrop Grumman Cygnus spacecraft for resupplying the American portion of the ISS.


See also

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References

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