KOREASAT 6

Koreasat 6 is a South Korean geostationary communications satellite operated under the Koreasat fleet and cataloged by the United States Space Surveillance Network under NORAD ID 37265. Assigned the international designator 2010-070B, the spacecraft was launched on December 28, 2010, and remains in orbit today, continuing to provide services from geostationary altitude. It represents one of the earlier milestones in South Korea's steady expansion of commercial satellite communications capacity during the first decade of the twenty-first century.

Mission and Purpose

Koreasat 6 was developed to serve as a geostationary communications satellite, a category of spacecraft that provides fixed broadcast, telecommunications, and data relay services to customers within a defined geographic footprint. Geostationary satellites of this type are workhorses of the modern telecommunications industry, enabling direct-to-home television broadcasting, broadband connectivity, and corporate data networks across large regions with a single orbital asset.

The satellite was operated by KT Corporation, the South Korean telecommunications company responsible for the Koreasat fleet, and falls under the administrative authority of KARI, the Korea Aerospace Research Institute, as noted in the orbital catalog. Upon its deployment in late 2010, Koreasat 6 was positioned at a geostationary slot of 116 degrees East longitude, a location that placed it over the Asia-Pacific region and allowed it to serve broadcast and communications customers across a substantial swath of that area.

Over its operational life, the satellite's role evolved. By the mid-2020s, its original orbital slot at 116 degrees East had been handed over to a successor spacecraft. The newer Koreasat 6A, launched in 2024, took over that position, effectively replacing Koreasat 6 in its legacy role over the Asia-Pacific broadcasting market. Rather than being retired, however, Koreasat 6 was repositioned to 160 degrees East longitude, where it entered into a contracted arrangement with Optus to deliver broadcasting services in support of Sky television operations. This kind of orbital relocation is a well-established practice in the commercial satellite industry, extending the useful service life of aging spacecraft by reassigning them to new customers and coverage zones as newer satellites assume primary responsibilities.

The specific technical parameters of the satellite's communications payload — including transponder count, frequency bands, and total throughput capacity — are not recorded in the publicly available orbital catalog entry, and the manufacturer of the spacecraft has not been confirmed in cataloged sources.

Orbit and Tracking

Koreasat 6 occupies a geostationary orbit, the class of orbit defined by an altitude and inclination combination that causes the satellite to appear essentially stationary over a fixed point on the Earth's equator. The physics underpinning geostationary orbit are straightforward: at the correct altitude, a satellite's orbital period exactly matches the rotational period of the Earth beneath it. For Koreasat 6, the cataloged orbital period is 1,436.2 minutes — almost exactly 24 hours — which confirms its membership in this elite category of orbit.

The spacecraft's apogee stands at 35,806 kilometers and its perigee at 35,785 kilometers, indicating an orbit that is very nearly circular. The difference of only 21 kilometers between the highest and lowest points of the orbit is characteristic of a well-maintained geostationary spacecraft that has been maneuvered to minimize eccentricity. The orbital inclination is recorded as 0.0 degrees, confirming that the satellite's orbital plane is aligned with the Earth's equatorial plane to the precision reported in the catalog. Satellites that drift away from this zero-inclination condition appear to trace a figure-eight pattern, known as an analemma, as seen from the ground — a behavior that operators work to prevent through regular north-south stationkeeping maneuvers.

Because geostationary satellites orbit at roughly 35,800 kilometers above the equator, they move across the sky very slowly as seen from the ground and are not visible to the naked eye under normal circumstances. Tracking Koreasat 6 with the standard tools available on this site will show it parked at a fixed azimuth and elevation for any given observer on Earth, drifting only imperceptibly over time. Professionals and hobbyists monitoring the geostationary belt can locate it using its cataloged orbital elements, which are updated regularly by the Space Surveillance Network.

Design and Operator

The satellite was built for and is operated within the Koreasat program, the series of commercial communications satellites that has served South Korea's telecommunications needs since the 1990s. KT Corporation, formerly known as Korea Telecom, is the commercial operator of the fleet. The broader institutional affiliation connects to KARI, South Korea's primary space research and development agency, which plays a coordinating role in the nation's satellite endeavors.

As of the available catalog data, the mass of Koreasat 6 at the time of this writing is not publicly recorded in the tracking entry. Background sources indicate the satellite had a launch mass in the range typical for medium-to-large geostationary communications platforms, consistent with a spacecraft carrying a full complement of broadcast and relay transponders alongside the fuel necessary for years of on-orbit stationkeeping. The identity of the manufacturer is not confirmed in the catalog and is therefore not stated here.

The satellite was launched on December 28, 2010, and its international designator, 2010-070B, encodes the year of launch, the 70th launch of that year, and its position as the second object cataloged from that particular launch event. The "B" designation typically indicates a secondary payload or an object other than the primary rocket body from that launch, though in the context of a dedicated satellite launch this simply reflects standard cataloging practice.

Current Status and Legacy

As of the time of writing, Koreasat 6 remains in orbit and has not experienced a cataloged decay or reentry event. Its transition from its original 116-degree East slot to 160 degrees East represents a practical demonstration of how commercial satellite operators maximize the return on aging spacecraft assets. Rather than accepting early retirement, Koreasat 6 found renewed purpose through a contracted agreement with Optus, the Australian telecommunications company, to support Sky broadcasting services from its new position.

This kind of mid-life repositioning carries significance beyond the economics of a single satellite. It reflects a broader industry pattern in which the geostationary arc is a finite and highly managed resource: orbital slots are licensed, coordinated through the International Telecommunication Union, and carefully traded or reassigned as the market evolves. The arrival of Koreasat 6A at the original 116-degree East position in 2024 marks a generational transition in the Koreasat fleet, while the elder satellite's continued operation from 160 degrees East demonstrates that geostationary spacecraft often outlast their originally contracted missions.

For South Korea specifically, the Koreasat program has been an important vehicle for developing national expertise in satellite operations and for securing guaranteed access to orbital slots and broadcasting spectrum in a competitive Asia-Pacific market. Koreasat 6's extended operational career contributes to that legacy, bridging the gap between older and newer generations of the national fleet.

Observing Koreasat 6

Koreasat 6 is not a practical target for casual visual observation. At geostationary altitude — approximately 35,800 kilometers above the equator — the satellite is far too distant and far too faint to be seen with the naked eye. Unlike low-Earth-orbit objects such as the International Space Station or certain large rocket bodies, which can appear as bright moving points of light passing overhead in minutes, geostationary satellites are effectively fixed points at extreme range and require optical aid even for dedicated observers.

Amateur astronomers with moderate-to-large telescopes can sometimes detect geostationary satellites as faint, nearly stationary points against the star background, particularly during twilight hours when sunlight illuminates the spacecraft while the sky remains relatively dark from the observer's perspective. For most users of this site, however, Koreasat 6 is of primary interest as a tracked object whose orbital elements, position in the geostationary belt, and catalog history can be explored through the standard reference tools available here. Its NORAD ID of 37265 provides a unique handle for querying its position and orbital history within any compatible tracking system.