A
trash-filled Russian cargo ship destined for destruction cast off from the
International Space Station (ISS) late Tuesday to help prime the orbital
laboratory for the arrival of a new crew next month.
The
unmanned Progress
25 supply ship undocked from the aft end of the space station's Russian-built
Zvezda service module at 8:37 p.m. EDT (0037 Sept. 19 GMT).
Russian flight
controllers plan to put the disposable space freighter through a week-long
series of propulsion maneuvers before commanding Progress 25 to plunge into
Earth's atmosphere and burn up during reentry.
"It's for
engineering testing and to gather data about the propulsion system," NASA
spokesperson Kylie Clem told SPACE.com of Progress 25's extra week in
space.
The cargo
ship's Tuesday departure clears a berth for a Soyuz spacecraft swap as the
space station's Expedition 15 astronauts prepare for the arrival of their
relief crew next month.
Expedition
15 commander Fyodor Yurchikhin and flight engineers Oleg Kotov and Clayton
Anderson will move their Russian-built Soyuz TMA-10 spacecraft from its
Earth-facing berth on the station's Zarya control module to Progress 25's
former port.
That move,
scheduled for Sept. 27, will clear a space for the incoming Expedition
16 commander Peggy Whitson, flight engineer Yuri Malenchenko and Malaysian
astronaut Sheikh Muszaphar Shukor. The Expedition
16 crew and Shukor are due to launch toward the ISS on Oct. 10 and dock two
days later.
Shukor,
Malaysia's first astronaut, will return to Earth with Yurchikhin and Kotov
while Anderson stays aboard the ISS to join the Expedition 16 crew.
Meanwhile,
space station flight controllers decided Tuesday that the ISS would not have to
have to fire its engines to distance itself from an old Strela rocket component
drifting in Earth orbit. On Monday, mission managers were concerned that the
spent rocket stage could pose a debris risk for the ISS. But after further analysis,
the space junk's trajectory was found to steer it well clear of the station,
NASA said.
Progress
25 arrived
at the space station in May to deliver more than 2.5 tons of fresh supplies
to the Expedition 15 crew. Its Tuesday departure left two Russian spacecraft -
the Soyuz TMA-10 and a newer Progress 26 cargo ship - still docked at the space
station.
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