Russian Rocket to ISS Faces Docking Glitch, Cosmonaut May Take Control

A Russian cargo spacecraft en route to the International Space Station (ISS) is facing a technical challenge after one of its critical antennas failed to deploy as planned following launch. While the Progress 94 spacecraft remains on course for a Tuesday docking, the issue has triggered a backup plan involving a cosmonaut manually piloting the vehicle to the station.

The Progress 94, launched Sunday at 7:59 a.m. EDT (4:59 p.m. Local time in Baikonur, Kazakhstan) aboard a Soyuz rocket, carries approximately 5,500 pounds of essential supplies – including food, water, fuel, oxygen, scientific equipment, and medical provisions – to the orbiting laboratory. Space.com reports that the launch itself proceeded smoothly, but shortly after separation from the rocket, one of the antennas necessary for automated docking did not function correctly.

Automated Docking Complicated, Manual Control Prepared

The antenna in question is part of the KURS automated rendezvous system, which typically guides the Progress spacecraft to a precise docking with the ISS’s Poisk module. NASA officials confirmed the issue via X (formerly Twitter), stating that all other systems on the spacecraft are operating as designed. NASA’s post detailed that cosmonaut Sergey Kud-Sverchkov is prepared to take manual control of the spacecraft if the antenna cannot be deployed. Kud-Sverchkov will utilize the TORU (Telerobotically Operated Rendezvous System), a backup control panel located in the Zvezda Service Module, to guide the Progress 94 to its docking port.

This isn’t the first time a docking procedure has required a manual override. The TORU system provides a crucial safety net, allowing for continued resupply operations even when automated systems encounter difficulties. The planned docking time remains Tuesday, March 24, at approximately 9:34 a.m. EDT, though the process will be more involved than originally anticipated.

Beyond the Antenna: Recent ISS Challenges

The Progress 94 mission has faced hurdles beyond the antenna issue. Originally slated for launch in mid-December 2025, the mission was delayed due to damage sustained to the launchpad, Site 31 at the Baikonur Cosmodrome. Live Science reported that the damage occurred after the launch of Expedition 73/74, though the exact cause was initially unclear. Russian authorities have since announced the repairs were completed earlier this month.

This incident adds to a series of recent challenges experienced at the ISS and with other space programs. Just two months ago, NASA astronauts were forced to return to Earth prematurely after one experienced an undisclosed medical emergency in space – a first in the station’s 26-year history. Astronauts Butch Wilmore and Sunni Williams were stranded on the ISS for an extended period due to issues with their return capsule, and Chinese astronauts recently faced a similar situation when their spacecraft was struck by debris.

Understanding Automated Docking Systems

Automated docking systems like KURS are vital for efficient and safe resupply missions to the ISS. These systems rely on radar and precise calculations to guide the spacecraft to the station, minimizing the need for direct human intervention. However, as the current situation demonstrates, these systems are not foolproof. Backup systems and the expertise of trained cosmonauts and astronauts are essential for addressing unexpected complications.

The KURS system, developed by Russia, uses a series of radar signals exchanged between the spacecraft and the ISS to determine relative position and velocity. The antenna plays a critical role in transmitting and receiving these signals accurately. Without a fully functioning antenna, the automated system’s ability to guide the spacecraft is compromised, necessitating manual control.

What to Expect During Manual Docking

Manual docking requires a high degree of skill and precision from the cosmonaut at the controls. Kud-Sverchkov, a veteran cosmonaut with previous long-duration spaceflight experience, will leverage the TORU system to visually align the Progress 94 with the docking port and carefully maneuver the spacecraft into place. This process is more time-consuming and requires constant monitoring of the spacecraft’s trajectory and velocity.

NASA will provide live coverage of the rendezvous and docking process, beginning at 8:45 a.m. EDT on Tuesday, March 24, on NASA+, Amazon Prime, and the agency’s YouTube channel. NASA’s blog post details how to access the livestream.

Looking Ahead: Continued ISS Resupply and System Monitoring

Despite the antenna issue, the successful launch of Progress 94 is a positive step towards ensuring a continuous supply of resources to the ISS. The spacecraft is delivering approximately three tons of vital supplies, including food, fuel, and scientific equipment. The incident underscores the importance of robust backup systems and the adaptability of the crews operating in space.

Following the docking, Roscosmos will continue to troubleshoot the antenna issue to determine the cause of the failure and prevent similar problems in the future. Ongoing monitoring of all ISS systems is crucial for maintaining the safety and operational efficiency of the orbiting laboratory. The incident will likely prompt a review of procedures and potential improvements to automated docking systems to enhance their reliability.