Dextre to Work with Spacewalkers for the First Time Ever!

Canadarm2 and Dextre

Dextre and Canadarm2. (Credit: NASA)

Dextre, the Canadian robotic handyman on board the International Space Station (ISS), will have a very important job to do from to . Dextre will convert an existing docking port on the ISS into a spaceport able to welcome the upcoming new US commercial crew vehicles. This means that crew vehicles other than the Russian Soyuz will be able to dock to the ISS. An International Docking Adapter (IDA) was designed to convert the port and was shipped to the ISS on board SpaceX's latest Dragon cargo ship. Next, Canada's robots are being called in to do the heavy lifting.

Dextre's job

The IDA was brought up on board SpaceX's Dragon-9 spacecraft. Both Canadarm2 and Dextre (riding on Canadarm2) are capable of removing equipment from Dragon's trunk, but because of the way Dextre moves, he is the only robot on the ISS that can reach and handle the IDA.

SpaceX Dragon, Canadarm2 and Dextre

SpaceX Dragon, Canadarm2 and Dextre. The ISS crew captured this view of Dextre at the end of Canadarm2, prepared to remove cargo from Dragon. (Credit: NASA)

Here are the steps that he will go through during the mission:

The animation below shows "in fast-forward" how this will be done.

Dextre helps astronauts install a docking adaptor on the ISS (Credit: Canadian Space Agency)

Dextre helps astronauts install a docking adaptor on the ISS (Credit: Canadian Space Agency)

This delicate operation will mark the first time that Dextre will hand off a payload directly to an astronaut. This operation cannot be done by Dextre alone, simply due to the design of the IDA and PMA2. The work requires extreme care on the part of the ground controllers and the astronauts to ensure that neither the IDA nor Dextre are damaged. The installation must be done properly to allow future astronauts and cargo to move safely from docked vehicles at this port to the ISS in a pressurized environment.

Expedition 48 Commander Jeff Williams and NASA astronaut Kate Rubins will conduct the spacewalk to install the equipment. This will be the fourth spacewalk in Williams' career, the first for Rubins, and the 194th for the Space Station.

Implications for the future

In addition to being yet another first for robot-kind, the new spaceport will be a gateway for the future of US spacecraft built by Boeing and SpaceX that will carry astronauts to the ISS. This will increase the number of opportunities to fly astronauts, and consequently, allow for more crew time dedicated to science. The new IDA will allow vehicles to dock in a gentler manner and will be more efficient than existing ports.

Watch Dextre at work live starting on around 6:30 p.m. EDT on UStream. Coverage of the spacewalk will begin on at 6:30 a.m. EDT on NASA TV.

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