Progress MS-21

Names	Progress 82P
Mission type	ISS resupply
Operator	Roscosmos
COSPAR ID	2022-140A
SATCAT no.	54155
Mission duration	660 days, 1 hour and 10 minutes (247 days planned)
Spacecraft properties
Spacecraft	Progress MS-21 no.451
Spacecraft type	Progress MS
Manufacturer	Energia
Launch mass	7000 kg
Payload mass	2.8 tons
Start of mission
Launch date	26 October 2022, 00:20:09
Rocket	Soyuz-2.1a
Launch site	Baikonur, Site 31
Contractor	Progress Rocket Space Centre
End of mission
Disposal	Deorbited (planned)
Decay date	2022 (planned)
Orbital parameters
Reference system	Geocentric orbit
Regime	Low Earth orbit
Inclination	51.65°
Docking with ISS
Docking port	Poisk zenith
Docking date	28 October 2022, 02:49:03 UTC
Time docked	657 days, 22 hours and 41 minutes (247 days planned)
Payload
Cargo and SCCS part of MLM Means of Attachment of Large payloads
Progress ISS Resupply ← Progress MS-20 Progress MS-22 →

Progress MS-21 (Russian: Прогресс МC-21), Russian production No.451, identified by NASA as Progress 82P, is a Progress spaceflight launched by Roscosmos to resupply the International Space Station (ISS). It is the 174th flight of a Progress spacecraft.

The Progress-MS is an uncrewed freighter based on the Progress-M featuring improved avionics. This improved variant first launched on 21 December 2015. It has the following improvements:^[1][2][3][4]

• New external compartment that enables it to deploy satellites. Each compartment can hold up to four launch containers. First time installed on Progress MS-03.
• Enhanced redundancy thanks to the addition of a backup system of electrical motors for the docking and sealing mechanism.
• Improved Micrometeoroid (MMOD) protection with additional panels in the cargo compartment.
• Luch Russian relay satellites link capabilities enable telemetry and control even when not in direct view of ground radio stations.
• GNSS autonomous navigation enables real time determination of the status vector and orbital parameters dispensing with the need of ground station orbit determination.
• Real time relative navigation thanks to direct radio data exchange capabilities with the space station.
• New digital radio that enables enhanced TV camera view for the docking operations.
• Unified Command Telemetry System (UCTS) replaces previous Ukrainian Chezara Kvant-V as the Progress spacecraft's on-board radio and antenna/feeder system.
• Replacement of the Kurs A with Kurs NA digital system.

On 3 February 2021, the State Commission for Testing of the Piloted Space Systems, chaired by Roskosmos head Dmitry Rogozin, approved the latest ISS schedule for 2021 and the first quarter of 2022.

A Soyuz-2.1a launched Progress MS-21 to the International Space Station from Baikonur Site 31 on 26 October 2022. Around 2 days after the launch, Progress MS-21 automatically docked with Poisk and continues its mission, supporting Expedition 68 aboard the ISS.

The MS-21 cargo capacity is 2,520 kg (5,560 lb) as follows:

• Dry cargo: 1,357 kg (2,992 lb)
• Fuel: 702 kg (1,548 lb)
• Nitrogen: 41 kg (90 lb)
• Water: 420 kg (930 lb)

It also delivered SCCS part of MLM Means of Attachment of Large payloads to ISS. It is a 4 segment external payload interface called means of attachment of large payloads (Sredstva Krepleniya Krupnogabaritnykh Obyektov, SKKO)^{[5][6][7][8][9]} According to plans, once the nadir end of SKKO was soft docked to Nauka and bolted down, the launch locks on SKKO would be released by the spacewalkers to allow it to be unfolded and extended with its joints self locking in the extended position to create a rigid frame. Then the Zenith end of SKKO would be soft docked to Nauka and bolted down. The three passive payload adapters and the one active payload adapter (i.e. active remote sensing payload like MIR Priroda's Travers Synthetic Aperture Radar) would then be outfitted. The SKKO was derived from the setup used on the Priroda module.^[10] SKKO will be launched inside the Progress spacecraft and transferred to a temporary storage location inside one of the station modules. It would be taken outside and installed on the aft facing side of Nauka during the VKD-60 spacewalk.^[11][12] LCCS part of MLM Means of Attachment of Large payloads was delivered to ISS by Progress MS-18 spacecraft.^[13] It was taken outside and installed on the ERA aft facing base point on Nauka during the VKD-55 spacewalk.^[14]

• Uncrewed spaceflights to the International Space Station

v t e Uncrewed spaceflights to the International Space Station
See also: ((Crewed ISS flights)) ((ISS expeditions))
2000–2004	2000 2R / Zvezda 1P 2P 3P 2001 4P 5P SO1 / Pirs 6P 2002 7P 8P 9P 2003 10P 11P 12P 2004 13P 14P 15P 16P
2005–2009	2005 17P 18P 19P 20P 2006 21P 22P 23P 2007 24P 25P 26P 27P 2008 28P ATV-1 29P 30P 31P 2009 32P 33P 34P HTV-1 35P MIM2 / Poisk
2010–2014	2010 36P 37P 38P 39P 40P 2011 HTV-2 41P ATV-2 42P 43P 44P† 45P 2012 46P ATV-3 47P SpX-D HTV-3 48P SpX-1 49P 2013 50P SpX-2 51P ATV-4 52P HTV-4 Orb-D1 53P 2014 Orb-1 54P 55P SpX-3 Orb-2 56P ATV-5 SpX-4 Orb-3† 57P
2015–2019	2015 SpX-5 58P SpX-6 59P† SpX-7† 60P HTV-5 61P OA-4 62P 2016 OA-6 63P SpX-8 64P SpX-9 OA-5 65P† HTV-6 2017 SpX-10 66P OA-7 SpX-11 67P SpX-12 68P OA-8E SpX-13 2018 69P SpX-14 OA-9E SpX-15 70P HTV-7 71P NG-10 SpX-16 2019 SpX-DM1 72P NG-11 SpX-17 SpX-18 73P 60S HTV-8 NG-12 SpX-19 74P Boe-OFT†
2020–2024	2020 NG-13 SpX-20 75P HTV-9 76P NG-14 SpX-21 2021 77P NG-15 SpX-22 78P Nauka NG-16 SpX-23 79P M-UM / Prichal SpX-24 2022 80P NG-17 Boe-OFT 2 81P SpX-25 82P NG-18 SpX-26 2023 83P SpX-27 84P SpX-28 NG-19 85P SpX-29 86P 2024 NG-20 87P SpX-30 88P NG-21
Future	2024 89P SpX-31 90P 2025 SpX-32 NG-22 SNC Demo-1 HTV-X1 SNC-1 2030 ISS Deorbit Vehicle
Spacecraft	Roscosmos Progress ESA ATV (past) JAXA HTV NASA CRS SpaceX Dragon 1 (past) SpaceX Dragon 2 Northrop Grumman Cygnus Sierra Nevada Dream Chaser (future) ISS Deorbit Vehicle
Ongoing spaceflights in underline Future spaceflights in italics † - mission failed to reach ISS