STAR ONE C3

Star One C3 is a Brazilian geostationary communications satellite operated by Star One, a subsidiary of the telecommunications firm Embratel. Catalogued by the United States Space Surveillance Network under NORAD ID 38991 and internationally designated 2012-062A, the satellite was launched in November 2012 and has remained operational in geostationary orbit ever since. It forms part of Brazil's expanding domestic satellite infrastructure, providing communications coverage to the country and surrounding regions of South America.

Mission and Purpose

Star One is the satellite services arm of Embratel, itself one of Brazil's largest telecommunications companies, and operates a fleet of geostationary satellites intended to serve the growing demand for broadcasting, broadband, and corporate data services across Latin America. Star One C3 was developed to expand that capacity, augmenting coverage and throughput for customers requiring reliable satellite connectivity across a continent where terrestrial infrastructure can be uneven in coverage and quality.

Brazil's geography — spanning an enormous land area with diverse terrain ranging from dense rainforest to coastal urban centers — makes satellite communications a particularly valuable tool for national connectivity. Geostationary satellites positioned above the equator can illuminate an entire continent simultaneously with a single spacecraft, making them well-suited to broadcasting and wide-area data services. Star One C3 fits squarely into this strategic role, sitting at a fixed position relative to the ground and offering consistent coverage to fixed and mobile terminals throughout its service area.

The specific frequency bands and transponder configuration of Star One C3 are not publicly documented in the satellite catalog, and mission status is not formally confirmed in tracking records. However, its continued presence in geostationary orbit more than a decade after launch is consistent with a satellite fulfilling an active or standby commercial communications role.

Orbit and Tracking

Star One C3 occupies a near-perfect geostationary orbit, one of the most stable and commercially valuable orbital regimes available. According to current tracking data, the satellite has an apogee of 35,804 km and a perigee of 35,785 km, giving it an extremely circular orbit with a difference of only 19 km between its highest and lowest points. This near-zero eccentricity is characteristic of a well-maintained geostationary slot. Its orbital inclination is recorded at 0.0°, meaning the satellite travels almost exactly in the plane of Earth's equator, and its orbital period is 1,436.1 minutes — very nearly 24 hours, which allows it to remain essentially stationary relative to a fixed point on Earth's surface.

This synchronization between orbital period and Earth's rotation is the defining characteristic of geostationary orbit. A satellite at this altitude and inclination does not rise and set like satellites in lower orbits; instead, it appears to hover at a fixed point in the sky when viewed from the ground. For telecommunications operators, this is enormously practical: ground antennas can be fixed in place rather than tracking a moving target, dramatically reducing infrastructure costs and complexity.

NORAD catalog entry 38991 and COSPAR designation 2012-062A are the standard identifiers used by satellite tracking agencies, amateur observers, and operators to unambiguously reference this object across databases worldwide. LowEarth and other tracking platforms use these identifiers to link orbital element sets (TLEs) to the correct spacecraft. Because Star One C3 sits in geostationary orbit roughly 35,800 km above the equator, its apparent motion in the sky as seen from the ground is minimal, and specialized tracking techniques are required to distinguish it from neighboring satellites clustered in the geostationary belt.

Design and Operator

Star One C3 was manufactured by Orbital Sciences Corporation — a major American aerospace company well known at the time for producing mid-sized commercial and government satellites — on the STAR-2 satellite bus platform. The STAR-2 bus was designed for medium-capacity geostationary missions, offering a modular architecture capable of carrying a range of communications payloads. Orbital Sciences later merged with Alliant Techsystems before the combined entity was acquired by Northrop Grumman, but at the time of Star One C3's construction, the company operated independently as a prominent commercial satellite manufacturer.

The satellite was launched on 10 November 2012 at 21:05 UTC, which corresponds to the evening of 9 November 2012 in United States Eastern Standard Time — hence the launch date of November 9, 2012 reflected in tracking records that use local time conventions. The launch vehicle was an Ariane 5ECA rocket operated by Arianespace from the Guiana Space Centre in Kourou, French Guiana. The Ariane 5ECA is a heavy-lift variant of the venerable Ariane 5 family, capable of lofting large dual-payload stacks to geostationary transfer orbit in a single mission.

Star One C3 shared its ride to orbit with Eutelsat 21B, a satellite operated by the European telecommunications consortium Eutelsat. Dual-manifest launches on Ariane 5 are standard practice, with one satellite typically occupying the upper berth and another the lower in the vehicle's payload stack. This arrangement allows Arianespace to offer more competitive launch economics to operators by splitting fixed launch costs between two customers. The mass of Star One C3 is not recorded in the public catalog, but mid-sized STAR-2 bus satellites are generally in the range common to medium commercial geostationary payloads.

Star One, as the satellite arm of Embratel, is ultimately owned within the broader América Móvil group, one of Latin America's dominant telecommunications conglomerates. Brazil is the registered owner country for Star One C3, reflecting both the nationality of the operating company and the satellite's primary service mandate over Brazilian and Latin American territory.

Current Status and Significance

Star One C3 remains in orbit as of the latest tracking data, with no reentry or decay date recorded. This is expected for a geostationary satellite — objects at approximately 35,800 km altitude are far above the outer boundary of the atmosphere and experience no meaningful aerodynamic drag. Without active station-keeping burns, a geostationary satellite will gradually drift in longitude and develop a small orbital inclination due to gravitational perturbations from the Moon, Sun, and the non-uniform mass distribution of Earth. However, with routine station-keeping, operators can maintain a satellite in a stable geostationary slot for the entirety of its design life, which for commercial satellites of this class is typically measured in years to decades.

The satellite represents a chapter in Brazil's long-term investment in national satellite capacity. Brazil has historically pursued domestic satellite capabilities both for commercial telecommunications and as a matter of strategic interest, recognizing that reliance on foreign satellite infrastructure for national communications introduces vulnerabilities. The Star One fleet, of which C3 is one member, has served to consolidate domestic control over key communications links for broadcasting, internet access, and corporate networking across a country of continental scale.

From a broader historical standpoint, the November 2012 dual launch alongside Eutelsat 21B illustrates the efficiency-driven commercial launch market of the era, in which large geostationary operators routinely co-manifested payloads on Ariane 5 missions to reduce per-kilogram launch costs. This practice became a defining feature of the geostationary commercial launch market through much of the 2000s and 2010s before the rise of competitively priced alternative launch vehicles began to shift procurement patterns.

The exact operational status of Star One C3 — whether it is actively carrying commercial traffic, serving as an in-orbit spare, or in some other configuration — is not publicly documented in the satellite catalog. Its orbital parameters, however, are consistent with a maintained, functional spacecraft occupying a deliberate geostationary position.

Observing Star One C3

Because Star One C3 is in geostationary orbit at an altitude of approximately 35,800 km, it is not observable to the naked eye under normal circumstances. Unlike satellites in low Earth orbit, which can appear as bright, fast-moving points of light crossing the sky in a matter of minutes, geostationary satellites move imperceptibly relative to the stars when viewed from the ground. They are effectively stationary, and at their great distance they reflect very little sunlight to ground-based observers.

Dedicated amateur astronomers with moderate to large aperture telescopes can detect geostationary satellites as faint, stationary or very slowly drifting points against the background of stars, particularly when imaging along the geostationary arc. Because Star One C3 sits at 0.0° inclination and is positioned above the equatorial plane, it is best placed for observation from locations in the tropics or subtropics, where it will appear higher in the sky. From higher latitudes, the geostationary arc sits closer to the horizon, making observations more difficult due to atmospheric extinction and obstructions.

Tracking Star One C3 through LowEarth and similar platforms is primarily of interest to satellite operators, frequency coordination authorities, and researchers monitoring the geostationary belt — rather than casual visual observers. Its NORAD ID 38991 can be used to retrieve current orbital elements and compute its precise sky position for any location on Earth.