Long March 2D

Long March 2D
Name	Long March 2D
Country	China
Manufacturer	China Academy of Launch Vehicle Technology
Height	43.5 m
Diameter	3.35 m
Mass	242000 kg
Status	Active
First	1992-11-09
Launches	80+

Long March 2D is a two-stage Chinese orbital launch vehicle developed for low Earth orbit and sun-synchronous orbit payloads, derived from the Long March 2 family and operated by the China National Space Administration, manufactured by the China Academy of Launch Vehicle Technology and launched from Jiuquan Satellite Launch Center, Taiyuan Satellite Launch Center, and Xichang Satellite Launch Center. The vehicle supports missions for commercial providers, research institutes, and defense-related organizations including payloads from the China Aerospace Science and Industry Corporation and cooperative launches with international partners. It has been used to place remote sensing, meteorological, and technology-demonstration satellites into orbit since the early 1990s.

Development and design

Development began as an evolution of the Long March 2F and earlier Long March 2C workstreams within the China Academy of Launch Vehicle Technology cadre, responding to requirements from the Ministry of Aerospace Industry of the People's Republic of China and later the China National Space Administration for a dedicated two-stage launcher capable of frequent access to sun-synchronous orbit for the China Meteorological Administration and scientific programs like BeiDou experiments. Design choices incorporated propulsion developments from the YF-20 and YF-22 engine families and avionics derived from the Shenzhou program and lessons from the Fanhui Shi Weixing recoverable satellite launches. Structural engineering used lessons from the Long March 3 series and materials testing involving the Shanghai Academy of Spaceflight Technology and the China Aerospace Science and Technology Corporation supply chain.

Technical specifications

The vehicle is 43.5 metres tall with a core diameter of 3.35 metres and a lift-off mass near 242 tonnes. The first stage uses clustered liquid rocket engines derived from the YF-21 family, fueled by N_2O_4 and UDMH hypergolic propellants, while the second stage employs a vacuum-optimized engine in the YF-24 lineage with restart capability for precise orbital insertion used by payloads such as Gaofen satellites and Huanjing platforms. Guidance and control subsystems integrate inertial measurement units developed by the Aerospace Science and Industry Corporation and telemetry systems compatible with the Beidou Navigation Satellite System and ground stations at Jiuquan Satellite Launch Center and Xichang Satellite Launch Center. Payload fairings are configurable to accommodate small to medium-class satellites, small constellations, and secondary payload dispensers devised by the China Academy of Space Technology.

Launch history

The maiden flight occurred in November 1992 from Jiuquan Satellite Launch Center delivering a test payload; subsequent launches have supported a steady cadence from Taiyuan Satellite Launch Center and Xichang Satellite Launch Center for civil and military customers including missions for the National Remote Sensing Center of China, the China Meteorological Administration, and commercial entities such as ChinaSat. Notable launches include deployment of reconnaissance and remote sensing spacecraft that contributed to programs like Gaofen, Fengyun, and experimental platforms associated with the Chinese Academy of Sciences. The launcher has been part of international commercial offerings through partnerships with agencies like the Asia-Pacific Space Cooperation Organization and firms engaging with United Nations Office for Outer Space Affairs coordination for multisatellite rideshares.

Variants and upgrades

Over its operational life, the vehicle received iterative avionics, propulsion, and fairing upgrades, influenced by developments in the Long March 2C and Long March 2F modernization efforts and by technologies proven on Shenzhou crewed missions. Upgrades incorporated improved YF engine variants, reinforced structures informed by testing with the China Aerodynamics Research and Development Center, and updated guidance software from collaborations with the China Academy of Electronics and Information Technology. Proposed and implemented variants included payload-capacity optimizations for dedicated sun-synchronous orbit missions and versions tailored for microsatellite constellation deployment in partnership with commercial launch-service providers.

Payloads and missions

The launcher has deployed an array of payloads: optical and multispectral remote sensing satellites such as Gaofen-1 and later entries in the High Resolution Earth Observation System, meteorological satellites in the Fengyun series, technology demonstration satellites from the Chinese Academy of Sciences, and civil navigation augmentation payloads complementing the BeiDou constellation. It has also carried satellite buses built by the China Academy of Space Technology and commercial satellites for operators like ChinaSat and international customers coordinated via the China Satellite Launch and Tracking Control General network. Secondary missions have included space-environment monitors developed by institutes like the National Space Science Center.

Operational performance and reliability

Operational records show a long-standing service history with a high success rate relative to contemporaneous launchers, sustained by systematic quality control at factories overseen by the China Aerospace Science and Technology Corporation and launch-site operations at Jiuquan Satellite Launch Center and Taiyuan Satellite Launch Center. Reliability improvements followed anomaly investigations involving collaboration with entities such as the Chinese Academy of Sciences and implementation of revised acceptance testing protocols influenced by practices from the European Space Agency and informal exchanges with international aerospace firms. The launcher remains a workhorse for China's medium-lift, polar-orbit insertion needs and continues to be fielded for both state and commercial missions.

Category:Long March (rocket family) Category:Space launch vehicles of China