Long March 4C

Long March 4C

The Long March 4C (also written CZ-4C) is a Chinese orbital launch vehicle operated by the China Aerospace Science and Technology Corporation (CASC). Developed by the Shanghai Academy of Spaceflight Technology (SAST), it is a three-stage, liquid-propellant rocket and a member of the Long March 4 family — one of China's most enduring and versatile rocket lineages. The vehicle launches primarily from Taiyuan Satellite Launch Center and Jiuquan Satellite Launch Center, serving as a workhorse for Chinese government and institutional payloads.

Design and Capabilities

The Long March 4C is an evolution of the Long March 4B, distinguished by its restartable third stage, which allows it to deliver payloads into a wider variety of orbits. This capability makes it particularly well-suited for sun-synchronous orbit (SSO) and polar orbit missions, which demand precise orbital insertion. All three stages burn nitrogen tetroxide and unsymmetrical dimethylhydrazine (UDMH), a hypergolic propellant combination long established in Chinese launch vehicle design. The restartable upper stage gives mission planners the flexibility to target multiple orbital planes or achieve more demanding altitude profiles in a single flight.

Flight History

According to tracked flight records, the Long March 4C has conducted 60 flights between 2006 and 2026, recording 58 successes alongside 2 failures or partial failures — a strong reliability rate reflective of the vehicle's maturity. The rocket's primary customer has consistently been CASC itself, reflecting the vehicle's central role in China's national space program rather than the commercial launch market.

The Long March 4C's manifest has been dominated by Earth observation and meteorological satellites. Recent missions illustrate this focus clearly: the rocket has lofted Gaofen-12 05, part of China's high-resolution optical reconnaissance and remote sensing constellation, and Fengyun-3H, the latest generation of China's polar-orbiting meteorological satellites. The Daqi-2 (AEMS) mission furthered China's atmospheric environment monitoring capabilities, while the Shiyan 23 and Shiyan 28 series missions — designated as experimental satellites — reflect the vehicle's continued use for technology demonstration payloads.

Role and Significance

Within China's broader launch vehicle fleet, the Long March 4C occupies a well-defined niche. While larger vehicles such as the Long March 5 handle heavy payloads to high-energy orbits, and newer commercial rockets target cost-sensitive smallsat customers, the 4C reliably serves the medium-class government payload segment — particularly the nation's expanding suite of remote sensing, meteorological, and experimental satellites. Its two-decade operational span and consistent mission cadence underscore its importance to China's civil and strategic space infrastructure.

As China's Earth observation ambitions have grown through programs such as the Gaofen and Fengyun series, the Long March 4C has remained the preferred delivery vehicle, accumulating one of the more extensive track records of any rocket in the Long March family. Its combination of orbital flexibility, proven reliability, and institutional backing ensures it remains an active and relevant launch system well into the 2020s.