KOREASAT 7

Koreasat 7 is a South Korean geostationary communications satellite operated by KT Sat and tracked in the catalog under NORAD ID 42691, with the international designator 2017-023A. Constructed by European aerospace manufacturer Thales Alenia Space, it was launched in May 2017 and has remained in continuous operation in geostationary orbit ever since. The satellite serves as a key piece of commercial telecommunications infrastructure for the Asia-Pacific region, positioned to provide coverage over East Asia from its station in the geostationary belt.

Mission and Purpose

Koreasat 7 was developed to expand South Korea's commercial satellite communications capacity, providing services across East Asia from a geostationary position at 116 degrees east longitude. The satellite is operated by KT Sat, a subsidiary of KT Corporation, one of South Korea's largest telecommunications companies. KT Sat manages the country's commercial satellite fleet and offers transponder capacity to broadcasters, internet service providers, and enterprise customers across the region.

The precise breakdown of payload instruments and transponder configurations aboard Koreasat 7 is not publicly recorded in the orbital catalog, and the specific mission type and current operational status are formally listed as unknown in the tracking record. However, satellites of this class and mass typically carry Ku-band and Ka-band transponders capable of supporting direct-to-home television broadcasting, broadband data services, and corporate network connectivity. Koreasat 7's positioning at 116 degrees east places it in an arc well suited to serving the Korean Peninsula, Southeast Asia, and parts of the western Pacific, complementing the broader fleet of satellites operated by KT Sat to ensure regional coverage redundancy and capacity.

The contract to build Koreasat 7 was awarded to Thales Alenia Space in 2014, at the same time the French-Italian manufacturer was engaged to produce Koreasat 5A, a companion satellite also operated by KT Sat. This pairing allowed the operator to modernize and significantly expand its orbital assets within a coordinated development program, leveraging Thales Alenia Space's experience in large commercial telecommunications platforms.

Orbit and Tracking

Koreasat 7 occupies a position in the geostationary belt, the ring of orbital slots approximately 35,786 kilometers above the equator where a satellite's orbital period matches the rotation of the Earth. This synchronization causes the satellite to appear effectively stationary when viewed from the ground, which is essential for fixed satellite services such as television broadcasting and dedicated data links that depend on stable, predictable antenna pointing.

The orbital parameters recorded for Koreasat 7 confirm its deep geostationary placement. Its apogee stands at 35,797 kilometers and its perigee at 35,793 kilometers, meaning the orbit is very nearly circular, with a difference of only four kilometers between its highest and lowest points. This near-perfect circularity is characteristic of a well-maintained operational geostationary satellite that has been maneuvered into its designated slot and station-kept with precision. The orbital inclination is recorded at 0.0 degrees, confirming that the satellite's orbital plane is aligned with the equatorial plane — another defining characteristic of a geostationary orbit. Its orbital period of 1,436.2 minutes is essentially equal to one sidereal day, the precise condition required for geosynchronous behavior.

Koreasat 7 is cataloged with NORAD ID 42691 and carries the COSPAR international designator 2017-023A. The "A" suffix in the COSPAR designation indicates that it was the primary payload of its launch. These identifiers allow the satellite to be unambiguously tracked across international space surveillance databases and distinguished from the many hundreds of other objects occupying the geostationary arc. As of the time of writing, Koreasat 7 has not decayed or reentered the atmosphere and remains in orbit.

Because geostationary satellites move with the Earth's rotation from the perspective of a ground observer, they are not easily spotted as moving points of light in the way that low Earth orbit satellites are. Koreasat 7 would appear, if visible at all, as a fixed, faint star-like point in the southern sky for observers at mid-latitudes in the northern hemisphere. It is not generally considered a readily observable object for casual skywatchers.

Design and Operator

Koreasat 7 was built by Thales Alenia Space, a joint venture between Thales Group and Leonardo (formerly Finmeccanica), headquartered in France with major facilities in Italy. Thales Alenia Space is one of Europe's leading manufacturers of telecommunications, Earth observation, and navigation satellites, with a long portfolio of geostationary platforms delivered to commercial and institutional customers worldwide.

The satellite has a recorded launch mass of 3,680 kilograms, placing it in the category of large commercial communications satellites. Spacecraft of this mass class are typically built on high-capacity geostationary platforms capable of hosting multiple dozens of transponders and generating several kilowatts of electrical power from large solar array wings. The specific platform designation used for Koreasat 7 is not listed in the public tracking record, but Thales Alenia Space has routinely employed its Spacebus and Spacebus Neo families of platforms for satellites in this size and mass range.

Koreasat 7 was launched on 3 May 2017 (UTC date transitioning into 4 May in local and some international time zones) atop an Ariane 5 ECA launch vehicle. The Ariane 5 ECA is a heavy-lift variant of the Ariane 5 rocket operated by Arianespace from the Guiana Space Centre in Kourou, French Guiana, and has been one of the most commercially dominant geostationary launch vehicles in history. It is frequently used to carry two large commercial payloads to a geostationary transfer orbit in a single mission, from which the satellites then use onboard propulsion to raise themselves into the final geostationary circular orbit.

KT Sat, as operator, is responsible for the day-to-day management of the satellite's orbital position, station-keeping maneuvers, and the commercial utilization of its capacity. As a licensed South Korean satellite operator, KT Sat coordinates its orbital slot usage through the International Telecommunication Union's regulatory framework governing geostationary arc assignments.

Significance and Current Status

Koreasat 7 represents a meaningful step in South Korea's sustained effort to maintain and expand an independent national commercial satellite communications capability. South Korea has operated satellites in geostationary orbit since the 1990s under the Koreasat program, which began with domestically procured but foreign-built platforms and has evolved to include increasingly capable and commercially oriented spacecraft. Koreasat 7, alongside its near-contemporary Koreasat 5A, reflects KT Sat's strategy of fleet renewal through partnerships with established international manufacturers rather than relying exclusively on domestic development programs.

The satellite's position at 116 degrees east is strategically significant within the Asia-Pacific communications landscape. The geostationary arc over this longitude provides line-of-sight access to a vast swathe of the continent stretching from Northeast Asia through Southeast Asia and into parts of Oceania, a region characterized by dense population, growing broadband demand, and complex geography that often makes terrestrial infrastructure challenging to deploy uniformly. Satellites like Koreasat 7 play a practical role in bridging connectivity gaps in this environment.

As of the current catalog record, Koreasat 7 remains in orbit with no reentry date recorded, consistent with an operational satellite expected to maintain its geostationary station for a service life typical of modern commercial platforms in its class. The mission status is not formally recorded in the public tracking catalog, meaning that detailed information about its current operational health or commercial utilization is not available through open sources. However, the satellite's continued presence in the orbital catalog without any anomaly designation indicates that it has not been publicly reported as failed or decommissioned.

At the end of its useful life, it will likely be moved to a graveyard orbit several hundred kilometers above the geostationary belt, in keeping with standard international practices for responsible end-of-life disposal of geostationary satellites. This practice preserves the commercially and strategically valuable geostationary arc from long-term debris accumulation.

Koreasat 7's tracking record on platforms such as LowEarth provides satellite enthusiasts, researchers, and industry professionals with a means of monitoring its cataloged orbital elements over time, observing the subtle maneuvers required to maintain its assigned slot, and contextualizing it within the broader population of active geostationary assets. Its clean, near-equatorial circular orbit makes it a textbook example of a properly stationed geostationary spacecraft, and its parameters serve as useful reference data for students of orbital mechanics and satellite communications alike.