Progress MS-31

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

Progress MS-31

Names	Progress 92 ISS 92P
Mission type	ISS resupply
Operator	Roscosmos
COSPAR ID	2025-146A
SATCAT no.	64751
Mission duration	23 days, 15 hours and 12 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 UTC[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	21 days, 13 hours and 19 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 launched on 3 July 2025 at 19:32 UTC.^[2] Following a two-day free flight, it will dock with the zenith port of the ISS's Poisk module on 5 July at 21:27 UTC.

Manifest

Each Progress mission delivers over a thousand kilograms of supplies in its pressurized section, accessible to crewmembers. These supplies include consumables such as food, water, and air, along with equipment for maintenance and scientific research. In its unpressurized section, the spacecraft carries tanks of water, fuel, and gases to replenish the station’s resources and sustain its onboard atmosphere. These resources are transferred to the station through an automated process.^[3]

For this mission, Progress MS-31 was loaded with a total of 2,625 kg (5,787 lb) of cargo and supplies prior to launch. The cargo manifest includes the following:^[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)