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Astra 2A
Astra 2A is one of the Astra communications satellites owned by SES. Launched in 1998 into the 28.2E orbital position, half its expected end-of-life capacity of 28 transponders were pre-booked by BSkyB, who utilised it to launch their new Sky Digital service. In March 2015, the satellite has been deactivated to be relocated to the Astra 23.5°E position.
==History==
The satellite suffered pre-launch technical issues with its apogee motors and was moved to a launch by the Proton rocket rather than the Ariane 5, as the Proton can inject directly in GEO.〔(The Satellite Encyclopaedia )〕
When positioned at 28E, it joined DFS Kopernikus 1, which served mainly Eastern Europe. The satellite was the first of Astra's craft to never carry analogue television services (with the exception of a solitary test card in 1999〔(LyngSat (archived) )〕), and as of 2006, carried standard definition digital television, digital radio, and high-definition digital television, as well as Sky Interactive streams and the AVC Broadband and Silvermead satellite internet services. Two beams "2A North" and "2A South" transmit on horizontal and vertical polarisation. The South beam covers almost all of Europe, with the North beam covering only Northern Europe at a high power.
In March 2015, two year's beyond Astra 2A's projected lifespan, and following the launches of Astra 2E in 2013, Astra 2F in 2012, and Astra 2G in 2014 to 28.2°E, all remaining traffic was transferred from Astra 2A to the newer satellites.〔(''Astra 2A frequencies moved to Astra 2E and 2F'' ) The Sat And PC Guy March 5, 2015. Accessed March 25, 2015〕 As of March 25, 2015 Astra 2A remains at the 28.2°E but it is inactive and is expected to be moved to Astra 23.5°E, to operate as a backup satellite to Astra 3B.〔''Where markets grow via satellite: Our global satellite fleet'' SES January 2012〕
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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