Progress MS-11 launches toward ISS on 2-orbit trek
A file photo of a previous Soyuz 2.1a rocket launching a Progress cargo ship. Progress MS-11 launched atop the same type of vehicle on April 4, 2019. Photo Credit: Roscosmos
Russia launched a Soyuz rocket with the latest Progress resupply freighter bound for the International Space Station, docking nearly 3.5 hours later.
Progress MS-11 launched atop a Soyuz 2.1a rocket from site 31 at Baikonur Cosmodrome, Kazakhstan. Liftoff took place at 7:01 a.m. EDT (11:01 GMT) April 4, 2019, setting the stage for the spacecraft to rendezvous with the outpost just over three hours later.
Four boosters fire concurrently with the core stage to push the Soyuz 2.1a rocket with Progress MS-11 off the launch pad at Baikonur Cosmodrome in Kazakhstan. Photo Credit: Roscosmos
Docking with the Pirs module occurred at 10:22 a.m. EDT (14:22 GMT). According to NASA, the spacecraft is brought with it 7,522 pounds (3,412 kilograms) of supplies including about 3,375 pounds (1,530 kilograms) of propellant, 105 pounds (50 kilograms) of oxygen and air and 926 pounds (420 kilograms) of water.
This two-orbit rendezvous profile was only the second time it had been performed successfully. The first time was during Progress MS-09 in July 2018. It is possible this trajectory could be used during future crewed Soyuz flights to get astronauts and cosmonauts to the station even faster.
The Soyuz 2.1a rocket, which rolled to the launch pad on April 1, is a 150-foot (46-meter), three-stage rocket. The first stage is composed of liquid-fueled strap-on boosters. With their RD-107A engines, which consume liquid oxygen and rocket-grade kerosene, they fired concurrently with the core stage, also known as the second stage, for about 2 minutes before falling away, having depleted their fuel.
Not long after, the payload fairing fell away as planned, exposing Progress MS-11 to space. Because the rocket was high enough above the atmosphere, it was no longer needed.
The core stage, powered by RD-108A engine, continued burning until about 5 minutes into flight when it separated and the third stage fired to continue pushing Progress MS-11 into orbit.
The launch of Progress MS-11 as seen from the International Space Station. Photo Credit: David Saint-Jacques/CSA
Orbital insertion took place some 9 minutes after launch. That was followed shortly after by the separation of the spacecraft and the deployment of its solar panels and antennas.
Once Progress MS-11 was within range of the ISS, it autonomously linked up with the Pirs module. Monitoring the launch from the space station’s Zvezda module was Russian cosmonauts Oleg Kononenko and Aleksey Ovchinin of Expedition 59. Kononenko is the commander of the station’s six-person increment.
Should there have been a problem during rendezvous, the two could have used the controls of the TORU, which is a backup manual docking system that can be used to remotely pilot the uncrewed spacecraft to the docking port. However, everything went by the book.
The next steps will be for leak checks to be performed. Following that, hatches between the station and spacecraft will be opened for cargo unloading to begin. Progress MS-11 is expected to remain at the outpost until mid-summer 2019.
This is the first of several cargo ships bound for the space station in April 2019. The next is expected to be Northrop Grumman’s NG-11 Cygnus spacecraft on April 17. That is planned to be followed by SpaceX’s cargo Dragon on April 25.
Video courtesy of Roscosmos
Derek Richardson
Derek Richardson has a degree in mass media, with an emphasis in contemporary journalism, from Washburn University in Topeka, Kansas. While at Washburn, he was the managing editor of the student run newspaper, the Washburn Review. He also has a website about human spaceflight called Orbital Velocity.
The fastest rendezvous and docking in Earth orbit was the 1966 Gemini 11 flight. It was a direct-launch-to-rendezvous in the first orbit. Docking occurred only 94 minutes after launch. Amazing!
The fastest Apollo docking was also a direct Moon to rendezvous on Apollo 14. The time from ascent from the lunar surface to docking with the orbiting command module was one hour and 45 minutes. And this with computers less powerful than your coffee machine.