ZHONGXING-12

Zhongxing-12 (also cataloged under the designation Zhongxing 15A) is a Chinese geostationary communications satellite operated by China Satellite Communications Co., Ltd., commonly known as ChinaSat. Launched in late November 2012, the spacecraft has been assigned NORAD catalog identifier 39017 and carries the international COSPAR designator 2012-067A. It represents part of China's sustained effort to expand its sovereign telecommunications infrastructure while simultaneously opening capacity to regional and international partners across an exceptionally broad geographic footprint stretching from East Asia to Africa and the Indian Ocean basin.

Mission and Purpose

The primary function of Zhongxing-12 is to provide communications services across a wide swath of the Eastern Hemisphere. China Satellite Communications, the state-backed enterprise that wholly owns the satellite, operates it as part of a broader fleet intended to serve both domestic Chinese users and customers across neighboring and more distant regions. The satellite's coverage envelope, as understood from public reporting, encompasses mainland China, the surrounding seas including the South China Sea region, South Asia, East Asia, the Middle East, Australia, and significant portions of Africa — an arc that traces much of the Indian Ocean littoral.

A notable commercial dimension of the mission involves SupremeSAT, a Sri Lankan satellite services company that leased a portion of the spacecraft's communications payload capacity. Under this arrangement, SupremeSAT has marketed its share of the transponder capacity as SupremeSAT-I, positioning it as the vehicle through which Sri Lanka could access its own dedicated slice of geostationary arc capacity without bearing the full cost and complexity of procuring an independent national satellite. This kind of hosted-payload or capacity-lease model is common in the commercial satellite industry, allowing smaller operators or nations to obtain orbital presence by partnering with larger satellite owners. For Sri Lanka, the arrangement represented a meaningful step in establishing a foothold in space-based telecommunications, enabling coverage relevant to the Indian subcontinent and surrounding maritime zones.

The precise nature of the communications payload — the specific frequency bands, transponder count, and power levels — has not been confirmed in publicly available catalog data. What is clear is that the satellite was designed to serve a diverse mix of potential customers across a geographically complex region, supporting applications that typically include broadcast television, broadband data relay, government communications, and maritime and aeronautical services in areas where terrestrial infrastructure is limited or absent.

Orbit and Tracking

Zhongxing-12 occupies a geostationary orbit, the category of orbit in which a satellite travels at an altitude and velocity precisely matched to Earth's rotational rate, causing it to appear stationary relative to the ground below. This characteristic makes geostationary orbit the preferred slot for communications satellites because ground-based antennas can be fixed in direction rather than requiring active tracking systems.

The satellite's current tracked orbital parameters confirm its position in this regime. Its apogee stands at 35,808 km and its perigee at 35,780 km, placing it in an orbit that is nearly perfectly circular at geostationary altitude. The slight difference between apogee and perigee — a spread of only 28 km across an orbit of tens of thousands of kilometers — is well within the tolerances typical of maintained geostationary spacecraft. Its inclination is recorded at 0.0°, consistent with a true equatorial orbit in which the satellite remains effectively fixed above a point on the equator. The orbital period of 1,436.1 minutes is essentially synchronous with Earth's rotation, confirming the satellite's geostationary status.

Tracking data assigns this object to the payload class, distinguishing it from the launch vehicle upper stage and any ancillary debris associated with the 2012-067 launch event. As of the time of this writing, Zhongxing-12 has not reentered Earth's atmosphere and remains an active or at minimum intact object in geostationary orbit. Its continued presence is verified through routine orbital surveillance.

Because geostationary satellites do not move across the sky from the perspective of ground observers, conventional visual passes — the kind associated with low Earth orbit spacecraft — do not apply here. Zhongxing-12 will appear, to the naked eye or binoculars, as a stationary point of light (if visible at all) fixed at a specific point in the southern sky for observers in the Northern Hemisphere, or the northern sky for those south of the equator. At geostationary distances, satellites are typically very faint and not easily observed without optical aid or precise pointing knowledge.

Design and Operator

Zhongxing-12 was manufactured by Thales Alenia Space, the Franco-Italian aerospace company that is one of the world's most prolific builders of commercial communications satellites. Thales Alenia Space has produced platforms for operators across multiple continents, and its involvement in Zhongxing-12 reflects the international commercial satellite market's dependence on a small number of highly experienced satellite prime contractors regardless of the nationality of the operator. The satellite has a recorded mass of 5,054 kg, placing it in the upper tier of large commercial communications spacecraft. Satellites in this mass class typically carry substantial fuel reserves for station-keeping maneuvers, large solar array structures to power high-capacity transponder arrays, and robust thermal control systems required to operate reliably in the harsh thermal environment of geostationary orbit over a design lifetime that commonly extends to fifteen years or more.

The operator, China Satellite Communications Co., Ltd., is the principal state enterprise in China responsible for managing commercial satellite communications services. The company oversees a fleet of geostationary satellites that collectively serve Chinese broadcasters, internet service providers, government agencies, and international customers across the regions its spacecraft cover. ChinaSat's satellites operate under the supervision of Chinese telecommunications regulators and are coordinated through international frequency and orbital slot processes managed under the framework of the International Telecommunication Union.

The choice to contract Thales Alenia Space as manufacturer underscores how Chinese satellite operators have historically sourced spacecraft from experienced Western and European builders while simultaneously developing domestic satellite manufacturing capacity through other programs. Zhongxing-12's production by a foreign manufacturer was thus both a practical procurement decision and a feature of the era in which it was ordered.

Coverage and Regional Significance

The geographic scope implied by Zhongxing-12's mission is notable for its breadth. A single geostationary slot positioned to serve China, South Asia, the Middle East, East Africa, Australia, and the Indian Ocean region simultaneously must contend with significant diversity in regulatory environments, demand patterns, and competing satellite services. The satellite's beam or beams — the specific antenna footprint configuration is not cataloged in publicly available sources — would need to balance effective isotropic radiated power against the practical need to illuminate such a large area.

The SupremeSAT arrangement added a dimension of diplomatic and commercial interest to the mission. Sri Lanka's use of leased capacity on a Chinese satellite to establish its own marketed orbital presence, branded separately as SupremeSAT-I, illustrates the layered economics of geostationary orbital capacity. Rather than a single monolithic use case, satellites like Zhongxing-12 can serve simultaneously as a national asset for the owning country, a commercial revenue stream through lease agreements, and a regional infrastructure asset for smaller economies that lack the resources to develop independent satellite programs.

Current Status

Mission status and operational condition for Zhongxing-12 are not confirmed in the public satellite catalog from which its identifying data is drawn. The satellite launched on November 26, 2012, and has not decayed or reentered as of the most recent tracking data. Whether it remains in active commercial service, has been placed in storage orbit, or is otherwise in a non-operational but intact condition cannot be stated with certainty based on available catalog information. Geostationary spacecraft that conclude their operational lives are typically maneuvered into a slightly higher "graveyard" orbit to vacate their assigned slot, and the proximity of Zhongxing-12's current apogee and perigee to ideal geostationary altitude suggests it has not undergone such a disposal maneuver as of the time its orbital elements were last published.

For researchers, broadcasters, telecommunications engineers, or satellite enthusiasts seeking current operational details — including active transponder frequencies, beam coverage maps, or service availability — direct inquiry to China Satellite Communications or monitoring of ITU filings would provide more current and authoritative information than orbital tracking catalogs alone can offer.