China continues remote-sensing buildup with new launch of Yaogan satellites (video)

China is continuing to launch trios of classified remote-sensing satellites to low Earth orbit.

A Long March 2D rocket lifted off into the night sky above the Xichang Satellite Launch Center in southwest China at 4:03 p.m. EDT on Oct. 23 (2003 GMT; 4:03 a.m. Beijing Time on Oct. 24).

The China Aerospace Science and Technology Corporation (CASC), the country’s state-owned main space contractor, confirmed launch success shortly after liftoff and revealed the previously undeclared payloads to be a new set of Yaogan 39 series satellites.

Related: China launches mysterious new spy satellite 

Little is publicly known about the Yaogan satellites. State media outlet China Daily described the spacecraft as remote-sensing satellites tasked with observing, surveying and measuring objects on land or at sea as well as monitoring weather. Western observers believe Yaogan satellites to be for at least partly military purposes. The wider series includes optical, radar and electronic intelligence gathering satellites.

The satellites were made by the China Academy of Space Technology (CAST) in Beijing and the Shanghai Academy of Spaceflight Technology (SAST), both major entities under CASC.

The new group joins three sets of Yaogan 39 triplets launched in August, September and earlier this month. Like the earlier satellites, the new gang entered orbits with an altitude of roughly 307 miles (495 kilometers) and inclined by 35 degrees.

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Each group will pass over the same points above Earth at different times, providing more frequent coverage over areas of interest.

The mission was China's 48th orbital launch of the year.