23 sty 2011

SPACE SHUTTLE ATLANTIS

The Space Shuttle Atlantis (Orbiter Vehicle Designation: OV-104) is one of the three operational Space Shuttle orbiters in the Space Shuttle fleet belonging to the National Aeronautics and Space Administration (NASA), the spaceflight and space exploration agency of the United States[2] (the other two operational Space Shuttles are the Discovery and the Endeavour). The Atlantis was the fourth operational (and the next-to-the-last) Space Shuttle to be constructed by the Rockwell International company in Southern California, and she was delivered to the John F. Kennedy Space Center in eastern Florida in April 1985.[3][4] Atlantis is the only orbiter which lacks the ability to draw power from the International Space Station while docked there, it must continue to provide its own power through fuel cells.[5]
In early 2008, the NASA Administrator, with the approval of the President and the United States Congress, decided to continue with the Atlantis making space flights until sometime in 2010, the tentatively predetermined end of the Space Shuttle's spaceflight program.[6] This reversed a previous decision to retire Atlantis in 2008.[7][8]
After its 32nd flight (STS-132), Atlantis has orbited the Earth more than 4600 times, traveling over 120 million miles in space,[9] or more than 500 times the distance from the Earth to the Moon. One additional 5 million mile flight is planned (STS-135).

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[edit] History

Atlantis heads toward Earth orbit at the beginning of STS-129.
Atlantis is named after RV Atlantis, a two-masted sailing ship that operated as the primary research vessel for the Woods Hole Oceanographic Institution from 1930 to 1966.[10] The 460-ton ketch carried a crew of 17 and had room for 5 scientists.[11] The former RV Atlantis is now commissioned as an oceanographic research vessel in the Argentine Naval Prefecture under the name Dr. Bernardo Houssay and finishing a lengthy period of restoration.[12][13]

[edit] Construction milestones


January 29, 1979Contract Award - Rockwell International
March 30, 1980Start structural assembly of crew module
November 23, 1981Start structural assembly of aft-fuselage
June 13, 1983Wings arrive at Palmdale from Grumman
December 2, 1983Start of final assembly
April 10, 1984Completed final assembly
March 6, 1985Rollout from Palmdale
April 3, 1985Overland transport from Palmdale to Edwards
April 9, 1985Delivery to Kennedy Space Center
September 5, 1985Flight Readiness Firing

[edit] Notable missions

Atlantis docked to the Space Station during STS-132 mission.
Space Shuttle Atlantis lifted off on its maiden voyage on October 3, 1985, on mission STS-51-J, the second dedicated Department of Defense flight.[14] It flew one other mission, STS-61-B, the second night launch in the shuttle program, before the Space Shuttle Challenger disaster temporarily grounded the shuttle fleet in 1986. Atlantis was used for ten flights between 1988 and 1992. Two of these, both flown in 1989, deployed the planetary probes Magellan to Venus (on STS-30) and Galileo to Jupiter (on STS-34). With STS-30 Atlantis became the first shuttle to launch an interplanetary probe.[15] During another mission, STS-37 flown in 1991, Atlantis deployed the Compton Gamma Ray Observatory. Beginning in 1995 with STS-71, Atlantis made seven straight flights to the former Russian space station Mir as part of the Shuttle-Mir Program. STS-71 marked a number of historic firsts in human spaceflight: 100th U.S. manned space flight; first U.S. shuttle-Russian Space Station Mir docking and joint on-orbit operations; and first on-orbit changeout of shuttle crew.[16] When linked, Atlantis and Mir together formed the largest spacecraft in orbit at the time.
Shuttle Atlantis has also delivered several vital components for the construction of the International Space Station (ISS). During the February 2001 mission STS-98 to the ISS, Atlantis delivered the Destiny Module, the primary operating facility for U.S. research payloads aboard the ISS.[17] The five hour 25 minute third spacewalk performed by astronauts Robert Curbeam and Thomas Jones during STS-98 marked NASA's 100th extra vehicular activity in space.[18] The Quest Joint Airlock, was flown and installed to the ISS by Atlantis during the mission STS-104 in July 2001.[19] The successful installation of the airlock gave on-board space station crews the ability to stage repair and maintenance spacewalks outside the ISS using U.S. EMU or Russian Orlan space suits. The first mission flown by Atlantis after the Space Shuttle Columbia disaster was STS-115, conducted during September 2006.[20] The mission carried the P3/P4 truss segments and solar arrays to the ISS. On ISS assembly flight STS-122 in February 2008, Atlantis delivered the Columbus laboratory to the ISS.[21] Columbus laboratory is the largest single contribution to the ISS made by the European Space Agency (ESA).[22]
STS-132- Liftoff Space Shuttle Atlantis.ogv
Space Shuttle Atlantis's last scheduled liftoff, STS-132 (480p / HD / 1080p)
In May 2009 Atlantis flew a seven member crew to the Hubble Space Telescope for its Servicing Mission 4, STS-125.[23] The mission was a success, with the crew completing five space walks totaling 37 hours to install new cameras, batteries, a gyroscope and other components to the telescope.
Among the five space shuttles flown into space, Atlantis has conducted a subsequent mission in the shortest time after the previous mission when it launched in November, 1985 on STS-61-B, only 50 days after its previous mission, STS-51-J.
The longest mission flown using shuttle Atlantis was STS-117 and lasted almost 14 days in June 2007.[24] During STS-117, Atlantis' crew added a new starboard truss segment and solar array pair (the S3/S4 truss), folded the P6 array in preparation for its relocation and performed four spacewalks. Atlantis was not equipped to take advantage of the Station-to-Shuttle Power Transfer System so missions could not be extended by making use of power provided by ISS.[25]
During the STS-129 post-flight interview on 16 November 2009 shuttle launch director Mike Leinbach said that Atlantis officially beat shuttle Discovery on the record low amount of Interim Problem Reports, with a total of just 54 listed since returning from the STS-125. He continued to add "It is due to the team and the hardware processing. They just did a great job. The record will probably never be broken again in the history of the Space Shuttle Program, so congratulations to them". However, during the STS-132 post-launch interview on 14 May 2010, shuttle launch director Mike Leinbach said that Atlantis beat its previous record low amount of Interim Problem Reports, with a total of 46 listed between STS-129 and STS-132.

[edit] Orbiter Maintenance Down Periods

To date Atlantis has gone through two overhauls of scheduled Orbiter Maintenance Down Periods (OMDPs) during her operational history.
Atlantis arrived at Palmdale, California in October 1992 for OMDP-1. During that visit 165 modifications were made over the next 20 months. These included the installation of a drag chute, new plumbing lines to configure the orbiter for extended duration, more than 800 new heat tiles and blankets and new insulation for main landing gear and structural modifications to the airframe.[26]
On November 5, 1997, Atlantis again arrived at Palmdale for OMDP-2 which was completed on September 24, 1998. The 130 modifications carried out during OMDP-2 included glass cockpit displays, replacement of TACAN navigation with GPS and ISS airlock and docking installation. Several weight reduction modifications were also performed on the orbiter including replacement of Advanced Flexible Reusable Surface Insulation (AFRSI) insulation blankets[27] on upper surfaces with FRSI. Moreover lightweight crew seats were installed and the Extended Duration Orbiter (EDO) package installed on OMDP-1 was removed to lighten Atlantis to better serve its prime mission of servicing the ISS.
During the stand down period post Columbia accident, Atlantis went through over 75 modifications to the orbiter ranging from very minor bolt change-outs to window change-outs and different fluid systems.[28]

[edit] Planned decommissioning

NASA had planned to withdraw Atlantis from service in 2008, as the orbiter would have been due to undergo its third scheduled OMDP. However, because of the final retirement of the shuttle fleet in 2010, this was deemed uneconomic. It was planned that Atlantis would be kept in near flight condition to be used as a parts hulk for Discovery and Endeavour. However, with the significant planned flight schedule up to 2010, the decision was taken to extend the time between OMDPs, allowing Atlantis to be retained for operations. Atlantis has been swapped for one flight of each Discovery and Endeavour in the current flight manifest. Atlantis has completed its last flight, STS-132, prior to the end of the shuttle program.[29] The extension of the Shuttle Program into 2011 has led to Atlantis being manifested to fly STS-135, which is now intended as the final Space Shuttle mission in June 2011.[30]
Once Atlantis is finally decommissioned, it will be one of two orbiters to be given as museum donations, the other being Endeavour (Discovery will go to the Steven F. Udvar-Hazy Center of the National Air and Space Museum). The National Museum of the United States Air Force at Wright-Patterson Air Force Base in Ohio has declared an interest in obtaining an orbiter to exhibit, and is especially keen on securing Atlantis, owing to her history as the main orbiter used for USAF and DoD missions.[31]

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