Undocking, re-entry and landing
BY WILLIAM HARWOOD
STORY WRITTEN FOR CBS NEWS "SPACE PLACE" & USED WITH PERMISSION
Posted: September 26, 2002
With the spacewalks complete, the combined shuttle-station crew plan to take time off on flight day 10, to complete logistics transfer operations and to transfer spacesuits and other hardware back to the shuttle for return to earth.
"Sandy Magnus is our transfer queen," said Melroy. "She is very detail oriented and very organized. And so, she's going to help us. She's going to be the general on transfer days. She carries all this in her head."
The next day, flight day 11, Atlantis will undock from the international space station, following a now-standard departure profile. With Melroy at the controls, the shuttle will back away to a point about 450 feet directly in front of the station. Melroy then will guide Atlantis through a fly-around of the station for routine photo documentation before departing the area for good.
The station maintains its orientation in space using control moment gyroscopes in the Z1 truss. Despite the unbalanced load represented by the S1 truss, the CMGs should have no problem compensating.
"As we build up the truss segment, we kind of have a back-and-forth situation where the truss is balanced and unbalanced," Algate said. "It is a bit more difficult to control, but our momentum management system with our control moment gyros can deal with that."
Likewise, the unbalanced load will cause no major impacts to routine procedures in which the shuttle's maneuvering jets are used to reboost the station's altitude. Two such reboost maneuvers are planned during Atlantis' mission, one on flight day five and one on flight day seven.
"On the shuttle side, looking at shuttle reboost, they did find some asymmetry in the jet firings and some of the jets get a little warmer because of the asymmetrical thrusts," Algate said. "As a result of that, in some of the reboost modes we had to cut back the maximum duration that we could do a shuttle reboost. As it turns out, for the reboost modes we're planning to use on this mission it won't have an impact."
The day after undocking, the astronauts will work through a standard pre-entry timeline, stowing equipment, testing the shuttle's entry systems and gearing up for the fiery plunge back to Earth.
"After we've undocked, we have the normal shuttle entry preparation activities, but in addition we have a secondary payload on this flight called SHIMMER," Engelauf said. "I confess, I even have to look up the name of this particular payload. It stands for 'Spatial Heterodyne Imager for Mesospheric Radicals.' It's an Air Force-sponsored payload that requires a little bit of out-the-window pointing for the shuttle to take some spectral images.
This payload is essentially a demonstration of a new remote sensing technique using ultraviolet wavelengths in mapping hydroxyl in density distributions, which would be useful mapping the ozone layer and the chemical hydroxyl, which is largely responsible for the breakdown ozone."
If all goes well, Ashby and Melroy will fire Atlantis' twin orbital maneuvering system braking rockets and glide to an afternoon landing at the Kennedy Space Center on Oct. 13 to close out an 11-day mission spanning 170 orbits and 4.5 million miles.
"When we get to the 2003 timeframe, we're not only doing assembly, we're doing reconfiguration," he said. "That's new for us. And by reconfiguration, we're going to pull a radiator off of P6 and it's going to be moved outboard to one of the solar arrays and attached out there. We're going to also fold up the entire P6 solar arrays and then move them out on the mobile transporter and attach them out on the end of the truss.
"Those are major activities in terms of reconfiguration, those have a lot more uncertainty in them because the hardware's been up and operating in orbit, it's not flying in a pristine condition, it's got some runtime on it, we're going to be operating out quick-disconnects and doing those things. So that's a new series of challenges for us that we're really got to stay focused on.
"The other thing that happens in that timeframe is we go from our power system now, which is essentially P6 providing us power, to where we're going to get the permanent power system," Gerstenmaier said. "It's a full two-string power system, full two-string communications system, full two-string thermal system. A lot of those systems right now are single string systems. So we have to shut off our power system and then bring up our new power system, our new thermal system, our new communications system. That also concerns me, because that's a very critical activity."
The ultimate Apollo 11 DVD
This exceptional chronicle of the historic Apollo 11 lunar landing mission features new digital transfers of film and television coverage unmatched by any other.
U.K. WORLDWIDE STORE
Mission overview - Atlantis to launch outward extension of station truss.
A trying summer for NASA - Small cracks in fuel flow liners grounded shuttle fleet.
Rendezvous and docking - Description of Atlantis' trek to catch the station.
Installing the S1 truss - The day after docking the Starboard 1 truss will be attached to the station with help of spacewalkers.
Plugging potential leaks - The second spacewalk will ready the S1 ammonia cooling system.
Odds and ends - The remaining highlights of the mission include a radiator deploy, treadmill repair and a final spacewalk.
Undocking, re-entry and landing - A look at the conclusion of Atlantis' 11-day voyage.
STS-112 index - A full directory of our mission coverage.
Astronomy Now presents Hubble: the space telescope's view of the cosmos. A collection of the best images from the world’s premier space observatory.
U.K. & WORLDWIDE STORE
NEW! This remarkable calendar features stunning images of planets, stars, gaseous nebulae, and galaxies captured by NASA's orbiting Hubble Space Telescope .
U.K. & WORLDWIDE STORE
Apollo 15 DVDs
Bring a unique piece of space history to your living room. Two- and six-disc Apollo 15 DVDs will be shipping soon.
U.K. & WORLDWIDE STORE