EUTELSAT 36B

EUTELSAT 36B is a geostationary communications satellite operated by the French satellite company Eutelsat, occupying a coveted orbital slot above the equator at 36 degrees East longitude. Catalogued by the United States Space Surveillance Network under NORAD identifier 36101 and carrying the international designator 2009-065A, the spacecraft has been in continuous service since its launch in late 2009. It shares its orbital position with a companion spacecraft, forming part of a cluster of Eutelsat assets serving broadcast and telecommunications markets across Europe, Africa, and the Middle East from this strategically important slot.

Mission and Purpose

The 36 degrees East orbital position has long been one of the most commercially significant geostationary slots available to European satellite operators. From this vantage point, a satellite's footprint can reach vast swaths of Eastern Europe, sub-Saharan Africa, and the broader Middle East, making it highly attractive for direct-to-home television broadcasting, data distribution, and telecommunications relay services. EUTELSAT 36B was positioned to augment and eventually succeed capacity at this location, joining an earlier spacecraft — Eutelsat 36A — at the same longitude.

While the specific mission details of EUTELSAT 36B are not publicly recorded in the satellite catalog, the broader context of Eutelsat's operations at 36 degrees East provides some guidance. The 36 East slot has historically been associated with high-demand broadcast services, particularly for audiences across Russia, sub-Saharan Africa, and Eastern European nations where direct-to-home satellite television became a dominant means of content delivery in the 2000s and 2010s. Satellites co-located at the same nominal longitude can share the same consumer dish pointing angle, allowing operators to expand transponder capacity without requiring subscribers to reposition their receiving equipment — a significant commercial advantage when deploying additional orbital assets.

Eutelsat, headquartered in Paris, is one of Europe's largest satellite operators and a founding member of the original intergovernmental Eutelsat organization that was privatized in the early 2000s. The company operates a broad fleet of geostationary satellites spanning numerous orbital slots, and the 36 East position represents one of its flagship locations by capacity and subscriber reach.

Orbit and Tracking

EUTELSAT 36B occupies a near-perfect geostationary orbit, with the tracking data confirming an apogee of 35,820 kilometers and a perigee of 35,770 kilometers above the Earth's surface. The difference of just 50 kilometers between these two values reflects an orbit that is very nearly circular, as is expected and required for a functioning geostationary satellite. An orbital inclination of 0.5 degrees indicates a very slight tilt relative to the equatorial plane — a near-zero figure that is characteristic of an operational geostationary satellite being maintained by periodic station-keeping maneuvers using onboard propulsion. Without such maneuvers, gravitational perturbations from the Moon, the Sun, and the non-uniform mass distribution of the Earth would gradually increase the orbital inclination over time.

The satellite completes one full orbit of the Earth in approximately 1,436.2 minutes, a period that very closely matches the Earth's own rotation period. This synchrony is the defining characteristic of geostationary orbit: from the perspective of a ground-based observer or receiving antenna, the satellite appears essentially stationary in the sky. This property makes geostationary orbit uniquely suited to broadcast and telecommunications applications, since fixed dish antennas on the ground can maintain a permanent lock on the satellite without any need for tracking mounts.

At approximately 35,800 kilometers altitude, EUTELSAT 36B is far beyond the realm of low Earth orbit satellites and operates at a distance that places it well outside the magnetosphere's inner radiation belts, though geostationary spacecraft do contend with the charged-particle environment of the outer Van Allen belt. The round-trip signal delay at this altitude — roughly a quarter of a second — is a well-known characteristic of geostationary links and influences the design of communication protocols used over satellite connections.

Because of its geostationary nature, EUTELSAT 36B does not exhibit the rapid apparent motion across the sky that makes low Earth orbit satellites straightforwardly trackable with amateur equipment. It remains essentially fixed above the 36 degrees East meridian, hovering above a point on the equator. It does not produce visible passes for ground observers in the way that spacecraft in low orbit do, and its brightness in the night sky is not sufficient to make it a practical naked-eye target.

Design and Operator

EUTELSAT 36B was manufactured by Alcatel Alenia Space, the Franco-Italian aerospace company that has produced many of Europe's major geostationary telecommunications satellites. At launch, the spacecraft had a mass of 5,627 kilograms, placing it firmly in the category of large geostationary communications platforms. Such spacecraft typically carry substantial arrays of solar panels to generate the electrical power needed to drive multiple communications transponders, along with deployable antenna reflectors and a chemical propulsion system for both apogee-raising maneuvers at the time of deployment and ongoing orbital station-keeping throughout the satellite's operational life.

The satellite belongs to Eutelsat's W series, a lineage of spacecraft the company has used to anchor key orbital positions across its fleet. The W series designation reflects an earlier Eutelsat naming convention, with the satellite also being widely referred to simply as Eutelsat 36B, a naming scheme that more directly encodes the orbital slot and sequence within the company's inventory at that location.

EUTELSAT 36B was launched on 24 November 2009 at 14:19:10 UTC, carried into orbit by a Proton launch vehicle — the Russian heavy-lift rocket that has been a workhorse of commercial geostationary satellite deployment for decades. The Proton, operated from the Baikonur Cosmodrome in Kazakhstan, has a long history of delivering large communications satellites to geostationary transfer orbit, from which the satellite's own apogee engine or an attached upper stage completes the journey to the final circular geostationary orbit. This launch approach was standard for the era and remains common for large commercial payloads.

Current Status and Significance

As of the data recorded in the satellite catalog, EUTELSAT 36B remains in orbit and has not undergone atmospheric reentry or been listed as decayed. Geostationary satellites at roughly 35,800 kilometers altitude are not subject to orbital decay on any humanly meaningful timescale under normal circumstances, as the atmosphere at that altitude is effectively nonexistent. Spacecraft at geostationary altitude that are retired from service are typically maneuvered into a so-called graveyard orbit several hundred kilometers above the geostationary arc, in accordance with international guidelines designed to preserve the geostationary belt for future operational satellites. Whether EUTELSAT 36B remains in active commercial service, has been placed in a reduced-operations mode, or has been retired to a disposal orbit is not recorded in the public catalog data available here.

The satellite's significance within the broader context of satellite telecommunications lies partly in the strategic importance of the 36 East slot and partly in what it represents about the expansion of geostationary capacity during the late 2000s. The years surrounding 2009 saw a substantial wave of new geostationary satellite deployments as demand for direct-to-home broadcasting — particularly in emerging markets across Africa and the former Soviet space — drove commercial operators to expand their fleets. The co-location of EUTELSAT 36B alongside Eutelsat 36A at the same orbital slot exemplifies a broader industry strategy of stacking capacity at proven, high-demand positions rather than attempting to develop entirely new orbital neighborhoods.

From a technical heritage standpoint, the involvement of Alcatel Alenia Space as manufacturer places EUTELSAT 36B within a well-documented lineage of European-built geostationary satellites that served as the backbone of commercial satellite broadcasting across two continents during the first decades of the twenty-first century. With a launch mass of 5,627 kilograms, the spacecraft represents the scale of investment that large telecommunications satellite deployments demanded during this period — each such mission representing a multi-year development program, a substantial launch cost, and a planned operational lifetime typically measured in fifteen years or more.

The combination of a near-circular orbit, an inclination held close to zero degrees through active station-keeping, and a fixed apparent position above the equator makes EUTELSAT 36B a textbook example of operational geostationary satellite deployment. Its orbital parameters as tracked and published confirm that the spacecraft is behaving precisely as a well-maintained geostationary satellite should, remaining locked to its assigned longitudinal slot and continuing to trace a stable path that, from the ground, appears as no path at all.