TELKOM 3S

Telkom 3S (also rendered as Telkom-3S) is an Indonesian geostationary communications satellite operated by Telkomsat, the satellite services subsidiary of the Indonesian state-owned telecommunications company PT Telekomunikasi Indonesia. Catalogued by the United States Space Surveillance Network under NORAD ID 41944 and international designator 2017-007A, the spacecraft was launched in February 2017 and remains operational in geostationary orbit. Its development was directly motivated by the failure of a predecessor mission, making it both a strategic asset for Indonesian telecommunications infrastructure and a demonstration of the country's continued commitment to maintaining sovereign satellite capacity.

Mission and Purpose

The origins of Telkom 3S lie in a significant setback for Indonesian space ambitions. An earlier satellite designated Telkom-3 was lost in August 2012 when its launch vehicle failed to deliver it to the correct orbit, rendering the spacecraft unusable. That loss left a gap in Telkomsat's fleet and prompted the procurement of a replacement capable of fulfilling the communications capacity that Telkom-3 had been intended to provide.

Telkom 3S was conceived to address that shortfall by delivering telecommunications relay services over Indonesia and the surrounding region. Geostationary communications satellites of this class typically carry a suite of transponders operating across multiple frequency bands — commonly C-band for broad regional coverage and Ku-band for more focused, higher-throughput services — allowing operators to offer a range of services including direct-to-home television broadcasting, broadband internet backhaul, and corporate data networking. The specific payload configuration of Telkom 3S is not publicly detailed in the orbital catalog maintained by the tracking community, and the satellite's mission type is listed simply as unclassified in standard reference databases.

What is well established is the strategic importance of the mission to Indonesia. As an archipelagic nation comprising more than seventeen thousand islands spread across a vast maritime territory, Indonesia faces inherent challenges in building and maintaining terrestrial communications networks. Geostationary satellites offer a practical solution by providing coverage of remote and sparsely populated areas that would be uneconomical to serve by fiber or terrestrial wireless infrastructure alone. For an operator like Telkomsat, maintaining a functioning geostationary fleet is therefore not merely a commercial objective but a matter of national connectivity policy.

After launch, Telkom 3S was commissioned into operational service in April 2017, approximately two months after it reached orbit — a timeline consistent with the in-orbit testing and handover procedures standard for commercial geostationary satellites of this class.

Orbit and Tracking

Telkom 3S occupies a geostationary orbit, the specialized circular orbit roughly 35,786 kilometers above Earth's equator at which a satellite's orbital period matches the planet's rotation rate, causing the spacecraft to appear stationary relative to a fixed point on the ground. This characteristic makes geostationary satellites particularly well suited for continuous communications relay, since antennas on the ground can be fixed rather than steered to track a moving target.

Current tracking data confirms that the satellite is maintaining a near-perfect geostationary configuration. Its apogee stands at 35,805 km and its perigee at 35,788 km, giving an orbit that is very nearly circular with only a modest difference between the highest and lowest points. The orbital inclination is recorded at 0.0°, confirming the satellite sits directly over the equatorial plane as expected for an actively station-kept geostationary spacecraft. Its orbital period is 1,436.2 minutes — closely matching the approximately 1,436-minute sidereal day — which is precisely the condition required for the satellite to remain geostationary.

Telkom 3S carries the NORAD catalog number 41944, and it was assigned the COSPAR international designator 2017-007A upon launch. These identifiers allow the satellite to be unambiguously tracked and distinguished from the thousands of other objects in Earth orbit. The "A" suffix in the COSPAR designator indicates it was the primary payload of its launch event, designated as the seventh orbital launch of 2017. As of current records, the satellite has not decayed or reentered the atmosphere and remains in orbit.

Because geostationary satellites appear fixed in the sky from a given ground location, they do not arc visibly across the sky in the manner of low Earth orbit objects. Ground-based optical tracking of geostationary spacecraft is therefore uncommon in casual observation contexts.

Design and Operator

Telkom 3S was designed and manufactured by Thales Alenia Space, the Franco-Italian aerospace company that is one of the world's most prolific builders of commercial telecommunications satellites. Thales Alenia Space has an extensive heritage in geostationary communications satellite construction, and its platforms are widely used by commercial and governmental operators across multiple continents. The specific bus or platform model used for Telkom 3S is not enumerated in the public orbital catalog.

The spacecraft has a recorded mass of 3,550 kg, placing it firmly in the category of large geostationary communications satellites. Satellites in this mass range typically require a heavy-lift launch vehicle capable of delivering significant payloads to a geostationary transfer orbit, from which onboard propulsion then raises the spacecraft to its final operational altitude. The satellite is registered to Indonesia as its owner country.

Telkomsat, the operating entity, functions as the satellite services arm within the broader Telkom Indonesia corporate group. Telkom Indonesia is majority-owned by the Indonesian government and serves as the country's primary national telecommunications carrier. Through Telkomsat, the government maintains operational control over geostationary orbital slots assigned to Indonesia under the international frequency coordination framework administered by the International Telecommunication Union. Holding and actively using such slots is important for preserving national rights over valuable orbital and spectrum resources.

Significance and Current Status

The successful deployment of Telkom 3S carried particular symbolic and practical weight given the circumstances that necessitated it. The failure of Telkom-3 in 2012 had been a costly episode, depriving Indonesia of planned satellite capacity and requiring Telkomsat to manage its service obligations with a reduced fleet. The smooth launch and subsequent commissioning of Telkom 3S in early 2017 represented a recovery from that setback and restored Indonesia's planned geostationary coverage.

More broadly, Telkom 3S fits within a longer pattern of Indonesian investment in space-based infrastructure. Indonesia was among the earliest developing nations to operate a domestic geostationary satellite fleet, having launched its first Palapa satellite in 1976. Telkom 3S continues that tradition of using sovereign satellite assets to address the practical communications needs of a geographically complex nation that cannot rely solely on ground-based networks.

From a commercial perspective, geostationary communication satellites of this generation typically have design lifetimes on the order of fifteen years, meaning Telkom 3S could reasonably remain in service through the early-to-mid 2030s, though the public orbital catalog does not specify a formal end-of-life date for the spacecraft. The satellite's current orbital parameters — with an inclination holding at 0.0° and a near-perfectly circular altitude profile — suggest that active station-keeping is being performed, consistent with a spacecraft still in operational use.

The satellite's current operational or mission status is not publicly recorded in the standard orbital catalog database, and no formal decommissioning announcement has been identified in public sources. It is therefore tracked as an active payload in geostationary orbit.

How to Observe Telkom 3S

Telkom 3S is a geostationary satellite, and as such its observing characteristics differ substantially from those of low Earth orbit objects. Because it matches Earth's rotation, it does not move across the sky from the perspective of a ground-based observer. Instead, it remains fixed at a single point above the equatorial plane, making it appear as a dim, stationary point of light rather than a moving streak.

Visual detection of geostationary satellites requires optical aid and favorable geometry. They are most detectable during twilight conditions, when the observer is in darkness but the satellite, at an altitude of roughly 35,800 km, is still illuminated by sunlight. At that distance, even a large satellite such as Telkom 3S — with its substantial solar arrays and antenna structures — will appear extremely faint to the naked eye and is generally the province of dedicated amateur astronomers using telescopes or sensitive imaging equipment.

Because Telkom 3S sits at an inclination of exactly 0.0°, it is positioned on the celestial equator as seen from Earth, and observers at equatorial and tropical latitudes are best placed to observe it high above the horizon. For observers at higher latitudes, the satellite will appear progressively lower in the southern sky (for those in the northern hemisphere) or northern sky (for southern hemisphere observers), becoming increasingly difficult to observe as it approaches the horizon. Precise tracking coordinates can be derived from its current two-line element set using standard satellite tracking software.