Watch the latest water satellite unfold itself in space
This illustration shows the SWOT spacecraft with its antenna mast and solar arrays fully deployed. Credit: NASA/JPL-Caltech

Engineers are working to prepare the mission to begin measuring the height of water on over 90 percent of Earth's surface.

The satellite needs to unfold its mast and antenna panels after it deploys the solar panel array that powers it. The satellite is monitored and controlled using data from the mission, but it also has cameras to record the action.

It took about 10 minutes for the solar array to deploy.

Two cameras aboard the Surface Water and Ocean Topography (SWOT) satellite captured the large mast and antenna panels of the spacecraft’s main science instrument deploying over four days, a process that was completed on Dec. 22, 2022. The masts, which unfold from opposite sides of the spacecraft, can be seen extending out from the spacecraft and locking in place, but the cameras stopped short of capturing the antennas at the ends of the masts being fully deployed (a milestone the team confirmed with telemetry data). This video places the two camera views side by side. Credit: NASA/JPL-Caltech/CNES

The antennas were successfully deployed over a four day period. The two cameras focused on the KaRIn antennas were unable to capture the mast being fully deployed, but they were able to capture the locking in of the mast.

The two antennas at either end of the mast are connected to the KaRIn instrument. The measurement of the height of water in Earth's freshwater bodies and ocean will be captured by KaRIn. It will collect data on lakes larger than 15 acres, as well as rivers larger than 100 meters across.

This series of images shows the deployment of the solar arrays that power the international Surface Water and Ocean Topography (SWOT) satellite. The mission, led by NASA and the French space agency Centre National d’Études Spatiales (CNES), captured the roughly 10-minute process with two of the four commercial cameras aboard the satellite (the same type used to capture NASA’s Perseverance rover landing on Mars). SWOT launched Dec. 16, 2022, at 3:46 a.m. PST from Vandenberg Space Force Base in California, and the arrays started their deployment at 5:01 a.m. PST. Credit: NASA/JPL-Caltech/CNES

KaRIn will do this by bouncing radar waves off the surface of water on Earth and receiving the signals with both of those antennas, collecting data along a swath that's 30 miles wide on either side of the satellite

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