At 8:55 a.m. on November 23, 2019, China successfully launched the fiftieth and fifty-first Beidou navigation satellites by a Long March 3B carrier rocket (and the supporting Expedition 1 upper stage) at Xichang Satellite Launch Center in a "one-arrow-two-star" mode.　　

Both satellites belong to medium circular earth orbit satellites, which are the network satellites of the Beidou-3 system currently under construction in China. After more than 3 hours of flight, the satellites entered the scheduled orbit smoothly and will be tested in orbit to provide services in due time.　

The BeiDou navigation satellite and the supporting launch vehicle (and the supporting upper stage of Expedition 1) were developed by the Institute of Microsatellite Innovation of the Chinese Academy of Sciences and the Institute of Launch Vehicle Technology of China Aerospace Science and Technology Group Corporation, respectively. This is the 319th flight of the Long March series of launch vehicles.　　

Dong Chongqing, secretary of the party committee of Xichang Satellite Launch Center, said that this launch is the 12th launch of the center this year, the center has always focused on high-density tasks highlighting the role of grass-roots typical leadership, planning to carry out a series of publicity "Xichang Space Hundred War heroes" to continue to stimulate the vitality of grass-roots power, and continue to cohesion of all personnel in the center