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Autonomous spaceport drone ship
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Autonomous spaceport drone ship : ウィキペディア英語版
Autonomous spaceport drone ship

An autonomous spaceport drone ship (ASDS), is a ship type: an ocean-going, barge-derived, floating landing platform that aerospace company SpaceX began using in early 2015 to conduct a flight test program to receive returning first stages after the boosters had lofted spacecraft onto an orbital trajectory.
By June 2015, a total of two ASDSs had been refit, with a third partially refit.
The first ASDS—''Just Read the Instructions'' (JRtI)—was converted from a barge named ''Marmac 300'' in late 2014 and was deployed in January 2015 during the CRS-5 cargo resupply mission to the International Space Station in order to provide a landing platform for a test flight of the returning booster stage. It was used for two landing tests through April 2015, and by June 2015, was retired as an ASDS.〔
The second ASDS—''Of Course I Still Love You'' (OCISLY)—was converted from a much-newer deck barge named ''Marmac 304'' in 1H2015 and became operational in June 2015 to support a landing test on the CRS-7 mission. Both JRtI and OCISLY were operational on the east coast of the United States and based at Jacksonville, Florida.
A third ASDS was partially refit at a Louisiana shipyard in early 2015 and then transited to the Pacific Ocean via the Panama Canal to the Port of Los Angeles, where it is completing refit to become operational on the west coast of the United States.
SpaceX ASDS ships form an important element of the SpaceX reusable launch system development program which aims to significantly lower the price of space launch services through "full and rapid reusability."〔
SpaceX indicated in November 2014 that they plan to eventually use ASDS as a floating ''launch'' platform, refueling a landed first stage with sufficient fuel to enable it to fly back to its launch site. No date has been provided for when this capability would be developed, tested or made operational.〔
==History==
As early as 2009 SpaceX CEO Elon Musk articulated ambitions for "creating a paradigm shift in the traditional approach for reusing rocket hardware."〔
In October 2014 SpaceX publically announced that they had contracted with a Louisiana shipyard to build a floating landing platform for reusable orbital launch vehicles. Early information indicated that the platform would carry an approximately landing pad and would be capable of precision positioning so the platform can hold its position for launch vehicle landing.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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