Expedition 73
.jpg) The Expedition 73 crew posing for a portrait inside the Zvezda module | |
| Mission type | Long-duration expedition |
|---|---|
| Operator | NASA / Roscosmos |
| Mission duration | 123 days, 2 hours and 10 minutes (in progress) |
| Expedition | |
| Space station | International Space Station |
| Began | 19 April 2025 |
| Ended | 9 December 2025 |
| Arrived aboard | |
| Departed aboard | |
| Crew | |
| Crew size | 7–11 |
| Members | |
| EVAs | 1 |
| EVA duration | 5 hours, 44 minutes |
 Expedition 73 mission patch .jpg) Left to right, top row: Peskov, Kim, Ryzhikov, Zubritsky and Onishi. Bottom row: Ayers and McClain. | |
Expedition 73 is the 73rd long-duration expedition to the International Space Station (ISS). The expedition began with the departure of Soyuz MS-26 on 19 April 2025 with JAXA astronaut Takuya Onishi taking over the ISS command.[1] It continues the extensive scientific research conducted aboard the ISS, focusing on various fields, including biology, human physiology, physics, and materials science. The crew members also maintain and upgrade the space station systems.
Background, Crew, and Events
The expedition consisted of NASA astronauts Anne McClain, Nichole Ayers, and Jonny Kim, JAXA astronaut Takuya Onishi, and Roscosmos cosmonauts Kirill Peskov, Sergey Ryzhikov, and Alexey Zubritsky.
The expedition has seen one spacewalk so far. On May 1, 2025, McClain and Ayers performed a 5-hour, 44-minute EVA to install a modification kit on the port side of the station’s truss structure enabling the future installation of its seventh iROSA and relocated an antenna that communicates with approaching and departing commercial crew and cargo spacecraft.
On June 26, 2025, the crew was joined by the staff of Axiom Mission 4's Crew Dragon Grace: commander Peggy Whitson of the United States, pilot Shubhanshu Shukla of India, and mission specialists Sławosz Uznański-Wiśniewski of Poland and Tibor Kapu of Hungary.[2][3] Their mission marked India, Poland, and Hungary's return to crewed spaceflight for the first time in over 40 years.[4] During their two-week stay aboard the ISS, the astronauts carried out 60 experiments planned by 31 different countries.[3][5]
SpaceX Crew-11 arrived at the ISS on August 2, transporting NASA astronauts Zena Cardman and Michael Fincke, JAXA astronaut Kimiya Yui, and Roscosmos cosmonaut Oleg Platonov. The mission featured a handover with Crew-10 of six days. Onishi handed over command of the space station to Ryzhikov on August 5. Crew-10 departed with McClain, Ayers, Onishi, and Peskov on August 8.
Events manifest
Events involving crewed spacecraft are listed in bold.
Previous mission: Expedition 72
19 April 2025 - Soyuz MS-26 Undocking, official switch from Expedition 72
22 April 2025 - CRS SpX-32 Docking
1 May 2025 - EVA 1 (US-93) McClain/Ayers: 5 hrs, 44 mins
23 May 2025 - CRS SpX-32 Undocking
26 June 2025 - Axiom Mission 4 Docking (Non-Expedition crew)
1 July 2025 - Progress MS-29/90P Undocking
5 July 2025 - Progress MS-31/92P Docking
14 July 2025 - Axiom Mission 4 Undocking (Non-Expedition crew)
2 August 2025 - SpaceX Crew-11 Docking
5 August 2025 - ISS Expedition 73 Change of Command Ceremony from Takuya Onishi to Sergey Ryzhikov
8 August 2025 - SpaceX Crew-10 Undocking
25 August 2025 - CRS SpX-33 Docking (planned)
27 November 2025 - Soyuz MS-28 Docking (planned)
8 December 2025 - ISS Expedition 73/74 Change of Command Ceremony from Sergey Ryzhikov to Michael Fincke
9 December 2025 - Soyuz MS-27 Undocking, official switch to Expedition 74 (planned)
Next mission: Expedition 74
Crew
| Flight | Astronaut | Increment 73a | Increment 73b | Increment 73c | Increment 73d |
|---|---|---|---|---|---|
| 19 Apr-2 Aug 2025 | 2-8 Aug 2025 | 8 Aug-27 Nov 2025 (ongoing) |
27 Nov-9 Dec 2025 (planned) | ||
| Soyuz MS-27 |  Sergey Ryzhikov, RoscosmosThird spaceflight |
Flight Engineer | Commander | ||
| Alexey Zubritsky, Roscosmos First spaceflight |
Flight Engineer | ||||
 Jonny Kim, NASAFirst spaceflight |
Flight Engineer | ||||
| SpaceX Crew-10 | Anne McClain, NASA Second spaceflight |
Flight Engineer | Off Station | ||
| Nichole Ayers, NASA First spaceflight |
Flight Engineer | Off Station | |||
 Takuya Onishi, JAXASecond spaceflight |
Commander | Off Station | |||
| Kirill Peskov, Roscosmos First spaceflight |
Flight Engineer | Off Station | |||
| SpaceX Crew-11 | Zena Cardman, NASA First spaceflight |
Off Station | Flight Engineer | ||
| Michael Fincke, NASA Fourth spaceflight |
Off Station | Flight Engineer | |||
| Kimiya Yui, JAXA Second spaceflight |
Off Station | Flight Engineer | |||
| Oleg Platonov, Roscosmos First spaceflight |
Off Station | Flight Engineer | |||
| Soyuz MS-28 (planned) |
Sergey Kud-Sverchkov, Roscosmos Second spaceflight |
Off Station | Flight Engineer | ||
| Sergey Mikayev, Roscosmos First spaceflight |
Off Station | Flight Engineer | |||
| Christopher Williams, NASA First spaceflight |
Off Station | Flight Engineer | |||
Vehicle manifest
| Vehicle | Purpose | Port | Docking date | Undocking date |
|---|---|---|---|---|
| Vehicles inherited from Expedition 72 | ||||
| Progress MS-29
|
Cargo | Poisk zenith | 23 Nov 2024 | 1 Jul 2025 |
| Progress MS-30
|
Cargo | Zvezda aft | 1 Mar 2025 | Aug 2025 |
| SpaceX Crew-10 "Endurance"
|
Exp. 72/73 crew | Harmony forward | 16 Mar 2025 | 8 Aug 2025 |
| Soyuz MS-27 "Favor"
|
Exp. 72/73 crew | Prichal nadir | 8 Apr 2025 | 9 Dec 2025 |
| Vehicles docked during Expedition 73 | ||||
| CRS SpX-32
|
Cargo | Harmony zenith | 22 Apr 2025 | 23 May 2025 |
| Ax-4 "Grace"
|
Visiting commercial mission | Harmony zenith | 26 Jun 2025 | 14 Jul 2025 |
| Progress MS-31
|
Cargo | Poisk zenith | 3 Jul 2025 | Dec 2025 |
| SpaceX Crew-11 "Endeavour"
|
Exp. 73/74 crew | Harmony zenith | 2 Aug 2025 | April 2026 (Exp. 74) |
| CRS SpX-33
|
Cargo | Harmony forward | 25 Aug 2025 | Fall 2025 |
| Soyuz MS-28 "Gyrfalcon"
|
Exp. 73/74 crew | Rassvet nadir | 27 Nov 2025 | 15 June 2026 (Exp. 74) |
| Segment | US Orbital Segment
|
Russian Orbital Segment
| ||||||
|---|---|---|---|---|---|---|---|---|
| Period | Harmony forward | Harmony zenith | Harmony nadir | Unity nadir | Rassvet nadir | Prichal nadir | Poisk zenith | Zvezda aft |
| 19–22 Apr 2025 | SpaceX Crew-10 | Vacant | Vacant | Vacant | Vacant | Soyuz MS-27 | Progress MS-29 | Progress MS-30 |
| 22 Apr–23 May 2025 | CRS SpX-32 | |||||||
| 23 May–26 Jun 2025 | Vacant | |||||||
| 26 Jun–1 Jul 2025 | Ax-4 | |||||||
| 1–5 Jul 2025 | Vacant | |||||||
| 5–14 Jul 2025 | Progress MS-31 | |||||||
| 14 Jul–2 Aug 2025 | Vacant | |||||||
| 2-8 Aug 2025 | SpaceX Crew-11 | |||||||
| 8 Aug 2025–present | Vacant | |||||||
The Prichal aft, forward, starboard, and aft ports all have yet to be used since the module originally docked to the station and are not included in the table.
References
- ^ "大西卓哉宇宙飛行士のISS船長（ISSコマンダー）就任決定" [Astronaut Takuya Onishi appointed as ISS Commander]. JAXA (in Japanese). 2 December 2024. Retrieved 24 December 2024. [ We are pleased to announce that Takuya Onishi, an astronaut from the Japan Aerospace Exploration Agency (JAXA), has been selected as the ISS commander for the International Space Station (ISS) Expedition 73. Astronaut Onishi will be the third Japanese ISS commander and will lead the ISS during the Expedition 73 mission.]
- ^ "Axiom Mission 4". nasa.gov. NASA. Retrieved 25 June 2025.
- ^ a b Harwood, William (26 June 2025). "Ax-4 crew docks with International Space Station after 28-hour rendezvous". cbsnews.com. CBS News. Retrieved 27 June 2025.
- ^ "India, Poland, Hungary make spaceflight comeback with ISS mission". france24.com. Agence France-Presse. 25 June 2025. Retrieved 27 June 2025.
- ^ "Polska na orbicie. Misja IGNIS wystartowała!". gov.pl. Ministerstwo Rozwoju i Technologii. 25 June 2025. Retrieved 25 June 2025.
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