The five-hour task sets the stage for final packing of the H-2 Transfer Vehicle with trash and refuse before the 33-foot-long craft leaves the space station March 28.
The ship delivered 8,500 pounds of experiments, supplies and spare parts to the station when it arrived Jan. 27. With the bulk of the unpacking already complete, the crew's attention is turning to stowing unnecessary items inside the HTV's pressurized cargo hold.
The trash includes bulky packing material carried to the space station inside the Permanent Multipurpose Module, a new storage room delivered by Discovery that was filled with supplies and experiments to keep the lab operating and producing science results.
But the HTV's mission was interrupted by Discovery's visit over the last few weeks. Nicknamed Kounotori 2, the HTV approached the space station from below, was grasped by the outpost's Canadian robot arm and placed on the Harmony connecting module's nadir, or Earth-facing, berthing port.
But that position would have been in the way of some of Discovery's mission tasks, so managers opted to move the HTV to Harmony's zenith, or space-facing, port Feb. 18.
Kounotori 2 must depart the space station from the bottom of the complex, so astronauts had to move the craft back to Harmony's nadir port Thursday.
Space station flight engineers Cady Coleman and Paolo Nespoli commanded the lab's robot arm for the relocation operation from the seven-window cupola, which offers crews an almost boundless view of the vehicle's exterior. Station commander Scott Kelly assisted Coleman and Nespoli.
Unbolting of the 15-ton spacecraft began around 1100 GMT (6 a.m. EST) and after a carefully choreographed series of robot arm maneuvers, Coleman and Nespoli placed the HTV on Harmony's nadir port at about 1620 GMT (11:20 a.m. EST).
Then two stages of bolts drove to create a firm connection between Harmony and the HTV.
The HTV is scheduled to be grappled again by the robot arm March 28, unberthed from the space station and released about 30 feet below the outpost.
Japanese controllers at the Tsukuba Space Center outside Tokyo plan to order the expendable spacecraft back into Earth's atmosphere March 29 over the Pacific Ocean, destroying the ship and its load of space station garbage.
The barrel-shaped H-2 Transfer Vehicle, covered in reflective power-producing solar panels, was removed from the Harmony module's nadir Earth-facing berthing port at 1142 GMT (6:42 a.m. EST). Flight engineers Paolo Nespoli and Cady Coleman led the HTV relocation procedures from robotic arm controls inside the station's cupola module.
After swinging the HTV from the bottom to the top of the station, astronauts guided the 33-foot-long spacecraft back to the Harmony module's zenith, or space-facing, berthing port at 1656 GMT (11:56 a.m. EST).
Harmony is one of three connecting modules on the U.S. side of the space station. It is the forward-most module of the orbiting lab and is also the arrival point for visiting shuttle missions.
Space station managers decided to move the HTV from Harmony's bottom port because it would be in the way of Discovery's docking to the complex. It would also prohibit removal of important cargo from the shuttle's payload bay.
Discovery is scheduled to launch Feb. 24 and arrive at the space station two days later. The shuttle is delivering more fresh supplies, the Leonardo permanent multi-purpose module and a logistics platform to be mounted outside the complex.
Nicknamed Kounotori 2, the HTV was carrying 8,500 pounds of experiments, spare parts and crew provisions when it berthed to the space station Jan. 27. The HTV approached the station from below, the lab's robot arm captured the free-flying craft from space and maneuvered it to Harmony's nadir port.
The HTV blasted off Jan. 22 from the Tanegashima Space Center in southern Japan.
Astronauts earlier this month retrieved two spare parts payloads from the HTV's exposed cargo bay and Canada's Dextre robot, designed to perform human-like tasks, temporarily stored the units outside the space station.
The crew has also nearly finished unloading nearly 6,500 pounds of supplies from the HTV's pressurized cabin. Astronauts are putting trash and waste into the spacecraft for disposal when the HTV burns up in the atmosphere at the end of its mission.
One the shuttle leaves the station, the spacecraft is scheduled to be moved back to Harmony's nadir position around March 7. The relocation date could change based on the progress of Discovery's mission and any possible extension of the shuttle's stay at the outpost, according to NASA.
The HTV's departure is expected March 28 and re-entry will occur one day later.
Operating Japan's robot arm from inside the complex, space station commander Scott Kelly picked up the cargo platform from the outdoor porch of the lab's Kibo module early Monday. Kelly handed the pallet off to the station's larger 58-foot-long Canadian robot arm, controlled by flight engineers Paolo Nespoli and Cady Coleman.
Aided by visuals from an alignment camera, Nespoli and Coleman carefully guided the pallet back to the cargo bay of the H-2 Transfer Vehicle mounted on the Earth-facing docking port of the outpost's Harmony connecting module.
The pallet slid back into the HTV with the help of three guide rails to ensure it was stowed correctly. The platform was placed back inside the spacecraft at 1457 GMT (9:57 a.m. EST) Monday, according to the Japan Aerospace Exploration Agency.
The space station crew continues unloading equipment in the HTV's pressurized cabin. Astronauts already transferred two refrigerator-sized Japanese scientific racks to the station's Kibo module.
The Kobairo science rack houses JAXA's gradient heating furnace for high-quality crystal growth experiments. It can heat samples up to 2,900 degrees Fahrenheit.
Another science rack delivered by the HTV will contain multiple smaller science investigations.
The 33-foot-long HTV blasted off Jan. 22 from the Tanegashima Space Center in southern Japan and reached the space station five days later. The resupply ship automatically approached the complex, receiving navigation cues from a laser sensor, and Coleman plucked the craft from space with the station's robot arm.
The spacecraft carried 8,500 pounds of cargo to the complex, including 6,455 pounds of supplies, experiments, crew provisions and computers packed inside its shirt-sleeve cabin.
The station crew will close the HTV's hatch and robotically move the spacecraft from the bottom to the top port of the Harmony module next week, making room for the shuttle Discovery's visit to the lab later this month.
Astronauts will move the craft back to Harmony's Earth-facing port in March to finish up cargo transfers, including the packing of trash inside the HTV for disposal.
The unmanned logistics freighter is scheduled to leave the space station March 28 and burn up on re-entry back into Earth's atmosphere the next day.
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Engineers will finish activating the HTV overnight and the crew will open hatches between Harmony and the HTV and ingress the ship at about 1230 GMT (7:30 a.m. EST) Friday.
External payload transfers are on tap for next week.
Paolo Nespoli, a native of Italy, is the primary robot arm operator for the berthing. Space station commander Scott Kelly is inspecting the common berthing mechanism to ensure it is ready to receive the HTV.
Meanwhile, controllers in Tsukuba, Japan, are readying the HTV for its two-month stay at the space station by putting some of its systems in a dormant or hibernating state.
"Congratulations to all of you and congratulations to the HTV flight control team," radioed astronaut Megan McArthur from Houston to the space station crew.
"It demonstrates what we can do when humans and robots work together," station flight engineer Cady Coleman replied. "We look forward to bringing HTV 2, Kounotori, on-board the International Space Station."
The HTV is nicknamed Kounotori, or white stork in Japanese.
Cady Coleman and Scott Kelly are inside the station's seven-window cupola module at the controls of the robot arm.
The craft is scheduled to remain at this hold point for about 20 minutes before pressing into the capture box about 10 meters from the space station.
The station crew is now participating in a capture briefing to go over procedures for today's HTV arrival.
The spacecraft should now be working with navigation data from its laser sensor, which shoots beams of light toward reflectors mounted on the bottom of the station for precise range and closing rate information.
The next step in the rendezvous is reaching an insertion point 500 meters, or 1,640 feet, below the station in less than an hour.
The cargo ship is scheduled to resume its approach at 0825 GMT (3:25 a.m. EST) en route to a rendezvous insertion point 500 meters, or 1,640 feet, directly below the space station.
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The 35,000-pound satellite blasted off at 0537 GMT (12:37 a.m. EST) Saturday from the Tanegashima Space Center in southern Japan. The H-2B rocket delivered the spacecraft to orbit 15 minutes later.
We have posted photos of the spectacular afternoon launch from Tanegashima.
The 33-foot-long spacecraft performed its first major engine firing seven-and-a-half hours after launch. Called a phasing maneuver, the burn changed the HTV's speed by 76 mph. The ship performed additional thruster firings on the two successive orbits.
Telemetry showed the ship reached a nearly circular orbit nearly 200 miles high following the maneuvers.
The next significant burn is on tap for Tuesday afternoon, U.S. time. It will be the first of three height adjustment maneuvers planned for the rendezvous with the space station.
Firings of the HTV's four main engines and more than two dozen thrusters tweak the craft's trajectory during its five-day chase of the complex. Engineers must plan the burns just right for the HTV to eventually reach a point about 30 feet below the outpost, in range of the station's robot arm.
The Japan Aerospace Exploration Agency reports the HTV, nicknamed Kounotori 2, is "continuing a smooth flight" on the way to the space station, where it will arrive Thursday. The lab's robot arm is scheduled to snatch the cargo craft from space around 1144 GMT (6:44 a.m. EST).
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Spacecraft separation should occur at T+plus 15 minutes, 11 seconds.
The rocket is shooting for an orbit with an apogee of 186 miles, a perigee of 124 miles, and an inclination of about 51.6 degrees.
The ignition sequence of the two first stage engines begins 5.2 seconds before liftoff.
The automatic sequence will begin at T-minus 4 minutes, 30 seconds and computers will pressurize the H-2B's propellant tanks for flight at T-minus 4 minutes, 20 seconds.
At T-minus 3 minutes, the launcher will transition to internal battery power and remove external power.
Water will be released onto the launch pad deck beginning at T-minus 73 seconds to help suppress sound and acoustics during the ignition and liftoff.
The vehicle's pyrotechnic and ordnance systems will be armed at T-minus 30 seconds and the rocket's guidance system initializes at T-minus 18 seconds. Batteries controlling solid rocket booster ignition are activated at T-minus 15 seconds.
Sparklers underneath the rocket's two main engines ignite at T-minus 11.7 seconds to burn off residual hydrogen that could be an explosive hazard at main engine start.
Inside the HTV's pressurized cabin, workers loaded 3,605 pounds of Japanese cargo and 2,850 pounds of NASA equipment, including crew provisions, scientific gear, computers and spare parts.
Launch Pad No. 1 of the Yoshinobu range hosts H-2A rockets and Launch Pad No. 2 is designed for the larger H-2B rocket, which was designed specifically for the H-2 Transfer Vehicle. The primary difference between the pads is the presence of a fixed umbilical tower at Pad 1, while Pad 2 features a "clean pad" concept and just a mobile umbilical tower attached to the launch platform.
In all, 26 rockets to date have departed Earth from the Yoshinobu complex since 1994. The most recent flight was an H-2A rocket launch in September 2010.
Also view a map of the trajectory the rocket will follow into space.
In the last few hours, launch officials completed a series of communications checks between the ground and the H-2B rocket.
The weather at the launch site looks favorable for liftoff.
The final hour of the countdown will prepare the rocket, the H-2 Transfer Vehicle, and ground systems for flight.
Today's launch is timed for precisely 0537:57 GMT (12:37:57 a.m. EST; 2:37:57 p.m. JST), when the Earth's rotation will bring Tanegashima into the orbital path of the space station. The rocket must launch at the appointed time because there is no launch window available.
The rocket is now fully fueled to liftoff, but cryogenic liquid hydrogen and liquid oxygen propellant continues to trickle into the vehicle to replace the fluid as it boils off.
Tanking will begin with a chilldown procedure to condition the rocket and propellant plumbing for the super-cold temperatures of liquid hydrogen and liquid oxygen. When fueling begins, officials will establish a 3,000-meter keep-out zone around the Yoshinobu launch complex.
The 186-foot-tall rocket rolled about 400 meters, or 1,300 feet, from Tanegashima's Vehicle Assembly Building to Launch Pad No. 2 at the space center's oceanfront launch complex. The transfer took about 30 minutes, according to the Japan Aerospace Exploration Agency, or JAXA.
Launch officials convened a few hours before rollout to assess weather conditions at Tanegashima, an island off the southern coast of Kyushu. The space center is positioned on the southeastern flank of the picturesque island.
A bad weather forecast earlier this week forced officials to put off the launch until Saturday. The flight was originally scheduled to take off Thursday, but thick clouds were predicted that could have prevented liftoff.
Workers were expected to connect the rocket's mobile launch platform to propellant, communications and electrical systems at the pad. Filling of the H-2B with liquid hydrogen and liquid oxygen is expected to begin after 2100 GMT (4 p.m. EST).
Both stages of the rocket burn cryogenic propellant.
Liftoff is scheduled for 0537:57 GMT (12:37 a.m. EST) Saturday. It will be 2:37 p.m. local time in Japan.
After turning southeast from Tanegashima and climbing into space, the rocket will deploy the 35,000-pound H-2 Transfer Vehicle about 15 minutes after blastoff.
The HTV is full of scientific equipment, provisions and other supplies for the six-person crew aboard the space station. The spacecraft is supposed to arrive at the outpost next Thursday, Jan. 27.
The mission is nicknamed Kounotori 2, which means white stork.
It is the second HTV flight by Japan. The first mission successfully carried logistics fo the space station in 2009, marking a major leap in space capability for the country.