EUTELSAT 8 WEST B

Eutelsat 8 West B is a geostationary communications satellite operated by Eutelsat, the Paris-based intergovernmental satellite organization. Launched in August 2015 and manufactured by Thales Alenia Space, it serves as a direct-to-home (DTH) broadcasting platform anchored at the 8° West orbital slot. Catalogued by the United States Space Surveillance Network under NORAD ID 40875 and carrying the international designator 2015-039B, the satellite remains in operational geostationary orbit and represents a significant node in Eutelsat's Atlantic-facing broadcast infrastructure.

Mission and Purpose

The primary role of Eutelsat 8 West B is to deliver direct-to-home television and multimedia broadcasting services to audiences across the regions visible from its geostationary position at 8° West longitude. This orbital slot places the satellite in a favorable geometry to serve parts of Europe, the Middle East, and the African continent, where demand for satellite-delivered broadcast content has historically been substantial.

DTH broadcasting via geostationary satellite remains one of the most commercially significant applications of space technology. From a fixed point above the equator, a single satellite can illuminate an enormous geographic footprint, allowing millions of small consumer dishes to receive signals without the need for terrestrial relay infrastructure. Eutelsat has operated the 8° West position for many years as a gathering point for high-traffic broadcast services, and Eutelsat 8 West B was developed specifically to expand and modernize capacity at that location.

Eutelsat announced the order for the new satellite in October 2012, contracting Thales Alenia Space to build a spacecraft on the Spacebus-4000C3 bus platform. That announcement came as demand for high-definition and eventually ultra-high-definition content was accelerating, placing greater pressure on operators to field more capable spacecraft with higher transponder counts and greater power. The specific details of the satellite's transponder complement and frequency plans are not enumerated in the public tracking catalog, but the Spacebus-4000C3 platform is a well-established heavy communications satellite bus designed to support large payload complements with high radio-frequency output.

The mission type and current operational status are not formally recorded in the satellite catalog entry consulted for this article. However, given Eutelsat's continued use of the 8° West arc for active DTH services and the satellite's confirmed presence in geostationary orbit, it is reasonable to describe it in general terms as a commercial broadcasting asset still associated with that fleet position.

Orbit and Tracking

Eutelsat 8 West B occupies a near-perfect geostationary orbit, as reflected in its tracked orbital parameters. With an apogee of 35,811 km and a perigee of 35,779 km, the satellite's orbit is very nearly circular, with an eccentricity approaching zero. This tight range between the highest and lowest points of its path is characteristic of a well-maintained geostationary spacecraft — operators expend onboard propellant to perform regular station-keeping maneuvers that counteract the perturbations introduced by solar radiation pressure, the gravitational influence of the Moon and Sun, and slight asymmetries in Earth's own gravitational field.

The orbital inclination of 0.1° is likewise a hallmark of active station-keeping. A perfectly equatorial geostationary orbit carries zero inclination, and the fact that this satellite's inclination remains at just 0.1° indicates that north-south station-keeping burns are still being performed. As a satellite nears the end of its operational life, operators typically cease these costly maneuvers first, allowing inclination to drift upward over time into what is called a graveyard or inclined geosynchronous orbit. An inclination this close to zero therefore suggests the spacecraft is either still in active service or was only recently retired.

The orbital period of 1,436.2 minutes — very close to the 1,436-minute sidereal day — is what defines geostationary behavior. A satellite completing one orbit in exactly the time it takes Earth to rotate once relative to the stars appears to hover motionless above a fixed point on the equator when viewed from the ground. For broadcast operators, this quality is indispensable: a consumer dish, once pointed and installed, requires no motorized tracking mechanism and can receive signals continuously without adjustment.

Eutelsat 8 West B is assigned NORAD catalog number 40875 and is tracked continuously by the Space Surveillance Network, which publishes two-line element sets (TLEs) allowing the satellite's position to be computed at any given moment. At geostationary altitude, the satellite travels at roughly 3 km/s relative to the center of Earth, but because this matches Earth's own rotational surface speed at the equator, it remains essentially stationary relative to ground-based observers.

Design and Operator

The spacecraft was built by Thales Alenia Space, the Franco-Italian aerospace manufacturer that is a major supplier of communications satellite platforms to operators worldwide. The Spacebus-4000C3 is one of the larger variants in Thales Alenia Space's Spacebus-4000 family, a line of three-axis stabilized geostationary platforms designed for high-power, long-life commercial missions. The "C3" designation within the family indicates a configuration supporting substantial electrical power output and a correspondingly large payload mass allocation.

Eutelsat 8 West B has a recorded launch mass of 5,782 kg. This places it firmly in the category of large geostationary communications satellites. At launch, a substantial fraction of that mass consists of bipropellant fuel used both for the apogee engine burn that circularizes the orbit following separation from the launch vehicle, and for the station-keeping propellant budget that sustains operations over the satellite's intended service life.

Eutelsat, the operator, is headquartered in Paris and was originally established as an intergovernmental organization in 1977 before transitioning to a private company structure in the early 2000s. It operates a large fleet of geostationary satellites and is one of the leading satellite operators globally by total in-orbit capacity. The 8° West position has been one of Eutelsat's historically important orbital slots, particularly for serving Arabic-language broadcast markets, and Eutelsat 8 West B was conceived as a next-generation asset to serve that corridor with updated capability.

The satellite was launched on August 19, 2015, entering orbit as the secondary payload indicated by its international designator suffix "B" — meaning it shared its launch vehicle with another spacecraft designated 2015-039A. Launch services for geostationary satellites of this class are typically provided by heavy-lift vehicles capable of delivering multi-tonne payloads to geostationary transfer orbit, from which the satellite's own propulsion system completes the journey to the final circular arc.

Current Status and Significance

As of the information available in the tracking catalog, Eutelsat 8 West B remains in orbit and has not undergone atmospheric reentry. Its orbital parameters — with inclination held near zero and altitude tightly maintained in the geostationary band — are consistent with a satellite that continues to receive active attention from its operators, whether in the form of ongoing commercial service or careful monitoring as it approaches end-of-life procedures.

The satellite's position at 8° West is part of a broader strategic logic that has made that particular arc a significant gathering point for broadcast traffic. From that vantage point, a transponder capacity in the Ku- or Ka-band can reach the densely populated North African littoral, the Arabian Peninsula, and European audiences simultaneously, depending on antenna design and beam shaping. The aggregation of multiple high-powered satellites at a single orbital slot creates what broadcasters call a "hotspot," where the concentration of channels makes it commercially attractive for consumers to align their dishes toward that position.

In the broader context of geostationary communications infrastructure, Eutelsat 8 West B represents the type of large, purpose-built direct broadcast satellite that dominated commercial space procurement in the 2010s. With a mass approaching 5,800 kg and a platform designed for high electrical power, it was engineered to deliver the bandwidth capacity needed as broadcast markets in its coverage zone expanded rapidly. Whether its full operational lifespan has been reached or whether it remains in active revenue service, the spacecraft stands as a characteristic example of large-scale European commercial satellite investment during that period.

Its continued presence in the geostationary belt, confirmed by ongoing tracking under catalog number 40875, means it can be located and monitored by amateur and professional observers alike using standard orbital propagation software and published TLE data from Space Surveillance Network sources.