Flight day 9 saw the end of STS-115's tasks at the ISS as Atlantis undocked from the International Space Station at 12:50 UTC.

Following the traditional farewell ceremonies between Expedition 13 and STS-115, the hatch between Atlantis and the ISS was closed and locked at 10:27 UTC.
Then, after a series of checks for leaks, Atlantis left the dock to begin its 360 degree flyaround of the expanded ISS to document the new configuration.
Flight day 9 saw the end of STS-115's tasks at the ISS as Atlantis undocked from the International Space Station at 12:50 UTC.
Following the traditional farewell ceremonies between Expedition 13 and STS-115, the hatch between Atlantis and the ISS was closed and locked at 10:27 UTC. Then, after a series of checks for leaks, Atlantis left the dock to begin its 360 degree flyaround of the expanded ISS to document the new configuration.
STS-115