Supply Ship Boosts Space Station’s Orbit

ISS Crew Welcomes Fresh Russian Cargo Ship
The Russian unmanned cargo ship Progress 21 is caught by a camera mounted to the exterior of the International Space Station as it prepared to dock at the outpost on April 26, 2006.
(Image: © NASA TV/collectSPACE.com.)

The InternationalSpace Station (ISS) reached a higher orbit Thursday after a cargo ship firedits engines during a brief, but successful, maneuver, NASA and Russian spaceofficials said.

TheProgress 21 cargo ship docked at the aft end of the station's Zvezda modulefired its onboard engines for 6.5 minutes, boosting the orbital laboratory'sorbit by about 1.7 miles (2.8 kilometers), NASA Johnson Space Centerspokesperson James Hartsfield told SPACE.com.

NASAofficials said the orbital boost prepared the ISS for the June arrival ofProgress 22, a new cargo ship that will launch from the Baikonur Cosmodrome,Kazakhstan in Central Asia atop a Soyuz rocket.

Progress 22is expected to launch on June 24 and dock at the ISS two days later, Hartsfieldsaid, adding that an older cargo ship - Progress20 - will be cast off prior to the new spacecraft's arrival. Progress 20has been dockedat the Russian-built Pirs docking compartment since December 23, 2005.

Thursday'sISS orbit reboost comes after an abortedtest of the two ISS engines attached to the Zvezdamodule's aft end. Russian ISS controllers used the test to check whetherthe Zvezda engines, which were last used in July 2000, were still operational.The failed engine firing did not affect the docking of Progress 21.

Progress 21arrived at the ISS on April 26 after a two-day spaceflightfrom Baikonur Cosmodrome. The cargo ship ferried 2.5 tons of food and suppliesto ISSExpedition 13 commander PavelVinogradov and flight engineer JeffreyWilliams. The two astronauts are in the midst of a six-month mission aboardthe ISS and arrivedat the station on April 1.

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