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|family = Long March |derivatives= Long March 3C |status = Active |sites = LA-2 & LA-3, XSLC |launches = 3B: 12 3B/E: 20 Total: 32 |success = 3B: 10 3B/E: 20 Total: 30 |fail = 3B: 1 |partial = 3B: 1 |first = 3B: 14 February 1996 3B/E: 13 May 2007 |stagedata = }} The Long March 3B (, ''Chang Zheng 3B''), also known as the CZ-3B and LM-3B, is a Chinese orbital carrier rocket. Introduced in 1996, it is launched from Launch Area 2 at the Xichang Satellite Launch Center in Sichuan. A three-stage rocket with four strap-on liquid rocket boosters, it is currently the most powerful member of the Long March rocket family and the heaviest of the Long March 3 rocket family, and is mainly used to place communications satellites into geosynchronous orbits. An enhanced version, the Long March 3B/E, was introduced in 2007 to increase the rocket's GTO cargo capacity and lift heavier GEO communications satellites. The Long March 3B also served as the basis for the medium-capacity Long March 3C, which was first launched in 2008. As of November 2015, the Long March 3B and 3B/E have conducted 30 successful launches, with two others ending in partial or complete failure. ==History== The development of the Long March 3B began in 1986 to meet the needs of the international GEO communications satellite market. During its maiden flight on 14 February 1996 carrying the Intelsat 708 satellite, the rocket suffered a guidance failure two seconds into the flight and destroyed a nearby town, killing at least six people, but outside estimates suggest that anywhere between 200 to 500 people might have been killed. However, the author of 〔 later ruled out large casualties, because evidence suggest that the crash site is evacuated before launching. The Long March 3B and 3B/E rockets conducted ten successful launches between 1997 and 2008.〔 In 1997, the Agila 2 satellite was forced to use onboard propellant to reach its correct orbit because of poor injection accuracy on the part of its Long March 3B launch vehicle.〔''International reference guide to space launch systems''. Fourth edition. p. 243. ISBN 1-56347-591-X.〕 In 2009, a Long March 3B partially failed during launch due to a third stage anomaly, which resulted in the Palapa-D satellite reaching a lower orbit than planned. Nonetheless, the satellite was able to maneuver itself into the planned orbit. The Long March 3B and its variants remain in active use , having conducted a total of 23 successful launches. In December 2013, a Long March 3B/E successfully lifted Chang'e 3, China's first Lunar lander and rover into the projected lunar-transfer orbit. 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「Long March 3B」の詳細全文を読む スポンサード リンク
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