Progress MS-31

Progress MS-31 (Russian: Прогресс МC-31), Russian production No. 461, identified by NASA as Progress 92, is a Progress cargo spacecraft launched by Roscosmos to resupply the International Space Station (ISS). It is the 184th flight of a Progress spacecraft.

Progress MS-31

Progress MS-31 docked to the Poisk module
Names	Progress 92 ISS 92P
Mission type	ISS resupply
Operator	Roscosmos
COSPAR ID	2025-146A
SATCAT no.	64751
Mission duration	114 days, 11 hours and 45 minutes (in progress)
Spacecraft properties
Spacecraft	Progress MS-31 No. 461[1]
Spacecraft type	Progress MS
Manufacturer	Energia
Launch mass	7,280 kg (16,050 lb)[2]
Start of mission
Launch date	3 July 2025, 19:32:40 UTC (4 July 2025, 00:32:40 AQTT)[2]
Rocket	Soyuz-2.1a
Launch site	Baikonur, Site 31/6
Contractor	RKTs Progress
End of mission
Disposal	Deorbited (planned)
Decay date	December 2025 (planned)
Orbital parameters
Reference system	Geocentric orbit
Regime	Low Earth orbit
Inclination	51.65°
Docking with ISS
Docking port	Poisk zenith
Docking date	5 July 2025, 21:25 UTC
Undocking date	December 2025 (planned)
Time docked	112 days, 9 hours and 52 minutes (in progress)
Cargo
Mass	2,625 kg (5,787 lb)
Pressurised	1,205 kg (2,657 lb)
Fuel	950 kg (2,090 lb)
Gaseous	50 kg (110 lb)
Water	420 kg (930 lb)
Progress flights ← Progress MS-30 Progress MS-32 →

Mission

Progress MS-31 was launched on 3 July 2025 at 19:32 UTC.^[2] Following a two-day free flight, it docked to the zenith (space-facing) port of the ISS's Poisk module on 5 July at 21:27 UTC.

Cargo

Each Progress mission delivers pressurized and unpressurized cargo to the station. The pressurized section carries consumables such as food, water, and air, along with equipment for maintenance and scientific research. The unpressurized section contains tanks of fuel, water, and gases, which are transferred to the station through automated systems.^[3]

For this mission, Progress MS-31 carried a total of 2,625 kg (5,787 lb) of cargo and supplies, including:^[4]

• Pressurized supplies: 1,205 kg (2,657 lb)
• Fuel: 950 kg (2,090 lb)
• Water: 420 kg (930 lb)
• Nitrogen gas: 50 kg (110 lb)