|
Space Launch Complex-6 (SLC-6, nicknamed "Slick Six") at Vandenberg Air Force Base in California is a launch pad and support area. The site was originally developed for the Titan III and Manned Orbiting Laboratory, which was cancelled before construction of SLC-6 was complete. The complex was later rebuilt to serve as the west coast launch site for the Space Shuttle, but again went unused due to budget, safety and political considerations. The pad was subsequently used for several Athena launches before being modified to support the Delta IV launch vehicle family, which have used the pad since 2006. Launches from Vandenberg fly southward, allowing payloads to be placed in high-inclination orbits such as polar or Sun-synchronous orbit, which allow full global coverage on a regular basis and are often used for weather, Earth observation, and reconnaissance satellites. These orbits are difficult to reach from Cape Canaveral, where launches must fly eastward due to major population centers to both the north and south of Kennedy Space Center. Avoiding these would require hugely inefficient maneuvering, greatly reducing payload capacity.〔(【引用サイトリンク】url=http://spaceflight.nasa.gov/shuttle/reference/shutref/sts/launch.html )〕 ==History== SLC-6, part of Vandenberg's "South Base," was originally part of the Sudden Ranch, prior to its purchase by the U.S. Air Force in the mid-1960s under the law of eminent domain. In addition to the ranch, the Point Arguello lighthouse was based there, which has since then been replaced by an off-shore LORAN tracker. With the purchase of the base, the Air Force started construction of the SLC-6 facility on March 12, 1966 to support launches of a modified Titan III for the Manned Orbiting Laboratory (MOL). After significant construction work was completed, the MOL program was cancelled on June 10, 1969, so further work on SLC-6 stopped as the facility was placed in mothball status. With plans of launching civilian and military equatorial space shuttle flights from Kennedy Space Center (KSC) and military polar orbit flights from Vandenberg, NASA and the Air Force looked at different sites for launching the shuttle, finally deciding upon SLC-6, due to its dedicated manned spaceflight role that was left over from the canceled MOL program. In 1972, Vandenberg AFB was chosen as the western launch site for Air Force shuttle launches. Use of SLC-6 was approved in 1975, and re-construction of the former MOL launch facility occurred between January 1979 and July 1986 as SLC-6 was rebuilt to accommodate the space shuttle. There were several reasons for using SLC-6: *Florida shuttle launches to polar orbit would have entailed a large payload penalty; *Florida shuttle launches to polar orbit would necessitate overflying South Carolina, and the external tank would be jettisoned and overfly Canada and Russia, and *Use of the existing and partially constructed Titan III facilities at SLC-6 would reduce building costs for the shuttle launch complex. A Senate report summarized: "The Air Force originally justified the expenditure of such SLC-6 funding on the basis of a need to launch high-priority military payloads into polar orbits. After Defense Department officials testified that polar orbits could not be achieved by launching from Kennedy Space Center in Florida, the Congress initiated construction of (. . . ) SLC-6." There were significant layout differences between the shuttle launch complexes at KSC and SLC-6 at Vandenberg. KSC had the Orbiter Processing Facility, Shuttle Runway facility, Mate-Demate Device (for loading the Orbiter on the Shuttle Carrier Aircraft), the Vehicle Assembly Building, and Launch Complex 39. SLC-6 consolidated the VAB (stacking) and LC-39 (launching) functions, while a processing facility, located at North Base, would have handled the vehicle processing, along with providing a Mate-Demate Device, and a runway for Shuttle landings. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Vandenberg AFB Space Launch Complex 6」の詳細全文を読む スポンサード リンク
|