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NORAD ID: 42684
Int'l Code: 2017-021A
Perigee: 399.9 km
Apogee: 403.4 km
Inclination: 42.8 °
Period: 92.4 minutes
Semi major axis: 6772 km
RCS: Unknown
Launch date: April 20, 2017
Source: People's Republic of China (PRC)
Launch site: Wenchang Satellite Launch Center (WSC)

TIANZHOU-1 is a Chinese mission on a mission is to conduct the on-orbit refueling of the Tiangong-2 space station. During this mission, the new vehicle will make three rendezvous attempts with Tiangong-2. Combined operations with the Tiangong-2 / Tianzhou-1 orbital complex will take place over two months. At the end of this period, Tianzhou-1 will separate from Tiangong-2 and will initiate an autonomous orbital mission for three months to carry out experiments and tests during that period of time. At the end of the mission, Tianzhou-1 will make an automatic destructive reentry into Earth’s atmosphere.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 42684U 17021A   17172.79390453 +.00073751 +00000-0 +96680-3 0  9998
2 42684 042.7862 327.3017 0002540 276.0703 235.1357 15.57634322009737
Source of the keplerian elements: AFSPC