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Progress M-UM Instrument and Assembly Compartment Undocked from the ISS

By Doug Messier
Parabolic Arc
December 22, 2021
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Progress M-UM cargo module departs the International Space Station. (Credit: Anton Shkaplerov)

MOSCOW (Roscosmos PR) — Today, December 23, 2021, at 02:03 Moscow time, the instrument-assembly compartment of the Progress M-UM cargo module undocked from the Prichal module of the International Space Station in the normal mode. Thus, he freed the airlock for subsequent docking of Russian manned and cargo ships.

The Progress M-UM module ship is an assembly of the Pryhal nodal module with an instrument-assembly compartment by means of a newly developed transition compartment. The instrument-assembly compartment by design corresponds to the instrument-assembly compartment of the base ship “Progress M” with modifications to increase its rigidity and strength in connection with the ship’s mass increased to 8,180 kg.

At 02:03 Moscow time, the specialists of the TsNIIMash Mission Control Center (part of the Roscosmos State Corporation) issued a command to undock the instrument-assembly compartment from the ISS, after which they undocked from the station and sent to “free voyage”. After it was withdrawn for safe removal, Russian specialists began a controlled descent of the instrument-assembly compartment from near-earth orbit.

The flight pattern of the instrument-assembly compartment after separation from the Prichal module is similar to the flight pattern of this compartment of the Progress M-CO1 and Progress M-MIM2 module ships. It is expected that the propulsion system will be engaged in braking at 06:45 Moscow time and will operate for about 13 minutes. After that, the instrument-aggregate compartment will begin to de-orbit and in about 24 minutes will enter the dense layers of the Earth’s atmosphere. The main part of the ship will burn up in the atmosphere, and the non-combustible elements will be flooded in the non-navigable region of the Pacific Ocean: 2,460 km from the city of Wellington and 7,030 km from the city of Santiago.

Progress M-UM cargo module departs the International Space Station. (Credit: Anton Shkaplerov)

The state corporation “Roskosmos” has completed all the procedures to establish this area as temporarily dangerous for navigation by sea and aircraft.

The instrument-and-assembly compartment of the Progress M-UM cargo vehicle-module has fully fulfilled its task of delivering the new Russian module to the International Space Station. With the help of Progress M-UM, on November 24, 2021, the Prichal nodal module was launched. Docking with the Russian segment of the ISS took place on November 26 in automatic mode.

The “Prichal” nodal module is designed to increase the technical and operational capabilities of the Russian segment of the ISS. Further development of the Russian segment of the station is ensured by connecting to the nodal module of transport systems, including promising ones. The developer of the nodal module is the Rocket and Space Corporation Energia (included in Roskosmos).

The “Prichal” nodal module is a spherical sealed compartment with components located inside and outside it, ensuring the performance of its tasks. It includes a body and a complex of on-board systems, including a control system for equipment, radio equipment, a system for ensuring a thermal regime, means for providing gas composition, means for controlling movement and navigation, transit lines for refueling, an active hybrid docking system, a passive hybrid docking system, means redocking.

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