China successfully put the Tianyi-51 and Tianyi-52 satellites into orbit with one launch, carrying two spacecraft on a single vehicle in what is known there as a "one rocket, two satellites" configuration.

The Tianyi line is a commercial small-satellite series used mainly for remote sensing and technology demonstration. Reaching the fifties in series numbering indicates that repeat manufacturing and sequential launches have settled into a routine.

Carrying several satellites on one vehicle is a standard way to lower launch costs. As the cost per satellite falls, the threshold for a company or research institute to put up its own spacecraft falls with it.

Small satellites play a different role from large geostationary craft. Circling quickly in low orbit, they can photograph the same area frequently, which suits crop monitoring, damage assessment after disasters and maritime traffic surveillance.

China's commercial space sector has reorganized into competing launch firms and satellite manufacturers. Unlike the period when state institutions led, private capital has shortened launch intervals.

Challenges remain. The growth of low-orbit constellations has made congestion and debris an international issue, and expectations are rising for clear plans to dispose of satellites at end of life.

The operator is to disclose later which sectors will receive the observation data from this mission.