|Plan diagram of Tiangong-1 with its solar panels extended|
|Launch||29 September 2011 at 21:16:03.507 CST|
|Launch pad||Jiuquan LA-4/SLS-1|
|Mass||8,506 kg (18,750 lb)|
|Length||10.4 m (34.1 ft)|
|Diameter||3.35 m (11.0 ft)|
|Pressurised volume||15 m3 (530 cu ft)|
|Perigee||355 kilometres (221 mi)|
|Apogee||362 kilometres (225 mi)|
|Orbital inclination||42 degrees|
|Days in orbit||597
(as of 18 May)
|Literal meaning||Heavenly Palace-1 or Sky Palace-1|
Tiangong-1 (Chinese: 天宫一号; pinyin: Tiāngōng yīhào; literally "Heavenly Palace 1") is China's first space station, an experimental testbed to demonstrate orbital rendezvous and docking capabilities. Launched unmanned aboard a Long March 2F/G rocket on 29 September 2011, it is the first operational component of the Tiangong program, which aims to place a larger, modular station into orbit by 2020. Tiangong-1 will be deorbited in 2013, and replaced over the following decade by the larger Tiangong-2 and Tiangong-3 modules.
Tiangong-1 will be visited by a series of Shenzhou spacecraft during its two-year operational lifetime. The first of these, the unmanned Shenzhou 8, successfully docked with the module in November 2011, while the manned Shenzhou 9 mission docked in June 2012. A third and final mission, Shenzhou 10, is scheduled to launch in 2013.
Design and development 
According to the China National Space Administration (CNSA), Tiangong-1 is an 8.5-metric-ton (19,000 lb) "space-laboratory module", capable of supporting the docking of manned and autonomous spacecraft. In 2008, the China Manned Space Engineering Office (CMSEO) released a brief description of Tiangong-1, along with its larger successor modules, Tiangong-2 and Tiangong-3. A model of the space station was revealed in the Chinese Lunar New Year celebration program on CCTV on 25 January 2009.
On 29 September 2008, Zhang Jianqi (张建启), vice-director of the CMSEO, declared in an interview with China Central Television (CCTV) that Tiangong-1 would be launched in 2010 or 2011. Xinhua later stated that Tiangong-1 would be launched in late 2010, and declared that the renovation of ground equipment was in progress. However, the launch did not ultimately take place until 2011.
By mid-2011, the construction of Tiangong-1 was complete, and its systems and thermal properties were undergoing testing. Testing was also conducted on the Long March 2F carrier rocket on which Tiangong-1 would be launched; technicians undertook particularly extensive safety tests on the rocket in August and September 2011, following the launch failure of a Long March 2C rocket on 18 August.
Tiangong-1 has a pressurised habitable volume of approximately 15 cubic metres (530 cu ft), and uses passive APAS-type docking connectors. Structurally, Tiangong-1 is divided into two primary sections: a resource module, which mounts its solar panels and propulsion systems, and a larger, habitable experimental module.
Onboard facilities 
Tiangong-1's experimental module is equipped with exercise gear and two sleep stations. The interior walls of the spacecraft have a two-color paint scheme – one color representative of the ground, and the other representative of the sky. This is intended to help the astronauts maintain their orientation in zero gravity. High-resolution interior cameras allow manned missions to be closely monitored from the ground, and the two sleep stations have individual lighting controls. Toilet facilities and cooking equipment for the manned missions are provided by the docked Shenzhou spacecraft, rather than being integrated into the Tiangong module itself. Similarly, one member of the module's three-person crew sleeps in the Shenzhou spacecraft, preventing overcrowding.
Mission profile 
Tiangong-1 was originally intended to be launched in August 2011, and was delivered to the Jiuquan Satellite Launch Center on 23 July, successfully passing a launch rehearsal test on 17 August. However, following the failed launch of a Long March 2C rocket in August 2011, the launch was postponed. Following an investigation into the August launch failure, Tiangong-1's launch was rescheduled for late September 2011, partly to coincide with the Chinese National Day on 1 October.
On 20 September 2011, the spacecraft was again rolled out to Pad 1 of the South Launch Site at Jiuquan in preparation for the rescheduled launch attempt. The launch occurred at 13:16 UTC on 29 September, successfully placing Tiangong-1 into low Earth orbit. Chinese television broadcast the launch animation accompanied by an instrumental version of the American patriotic song America the Beautiful, a choice of music for which it later offered no explanation.
Orbital transfers and testing 
On 2 October 2011, Tiangong-1 completed the second of two orbital transfer maneuvers, reaching an apogee altitude of 362 kilometres (225 mi). This was the precursor to a week-long program of orbital testing, conducted from the Beijing Aerospace Command and Control Center, to prepare the module for future orbital docking operations. On 10 October, Tiangong-1 released its first orbital photo, showing a view of its outer hull and satellite relay antenna.
Autonomous orbital docking 
The unmanned Shenzhou 8 mission successfully docked with Tiangong-1 on 2 November 2011 GMT, marking China's first orbital docking. Shenzhou 8 undocked from Tiangong-1 on 14 November, before successfully completing a second rendezvous and docking, thus testing the reusability of the docking system. Shenzhou 8 deorbited on 17 November 2011, and landed intact in Siziwang Banner in Inner Mongolia. After the mission, the CNSA reported that Tiangong-1's systems were in optimal condition.
Manned missions 
In December 2011, the Tiangong-1 module began automated internal checks for toxic gas, to ensure that its interior would be safe for astronauts to enter. In January 2012, reports emerged alleging that the American X-37B robotic spaceplane was shadowing Tiangong-1 for surveillance purposes. However, former United States Air Force orbital analyst Brian Weeden later refuted this claim, emphasizing that the X-37B occupied a different orbit to Tiangong-1, and would not be able to closely observe the module.
Shenzhou 9 
In March 2012, it was reported that China had finished the initial crew selection for the Shenzhou 9 mission. Niu Hongguang, the deputy chief commander of the China Manned Space Engineering Project, stated that Shenzhou 9 would dock with Tiangong-1 before August 2012. The Shenzhou 9 spacecraft was delivered to Jiuquan Satellite Launch Center for launch preparations on 9 April 2012, while its Long March 2F carrier rocket arrived a month later on 9 May.
Shenzhou 9 launched successfully on 16 June 2012, carrying with it China's first female astronaut, Liu Yang. The spacecraft docked with Tiangong-1 on 18 June 2012 at 14:07 Beijing time (06:07 GMT; 07:07 BST). After about three hours, when the air pressures inside the two vessels were equalized, mission commander Jing Haipeng entered Tiangong-1. The first docking was entirely computer-controlled, without input from the three astronauts; a second, crew-guided docking was successfully conducted on 24 June 2012 at 12:42 Beijing time. Shenzhou 9 landed safely in Inner Mongolia on 29 June 2012. In August 2012, Shenzhou 9's crew travelled to Hong Kong to discuss their mission with university students.
Shenzhou 10 
A second manned mission, and the final Shenzhou mission to rendezvous with Tiangong-1 before it is deorbited, is planned for June 2013. The launch was originally planned for earlier in the year, but was delayed to allow the mission to incorporate more complex scientific experiments.
Future development 
Tiangong-1 is intended as a testbed for key technologies that will be used in China's large modular space station, which is planned for launch in 2020. Furthermore, modified versions of Tiangong-1 will be used as robotic cargo spacecraft to resupply this station. The launch mass of the Tiangong-1-derived cargo spacecraft is expected to be around 13 metric tons (29,000 lb), with a payload of around 6 metric tons (13,000 lb).
Visibility from Earth 
See also 
|Wikimedia Commons has media related to: Tiangong-1|
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