INTELSAT 35E (IS-35E)

Intelsat 35e (IS-35e) is a commercial geostationary communications satellite operated by Intelsat, one of the world's largest fixed satellite service providers. Built by Boeing Satellite Development Center on the Boeing 702MP platform, it was launched in early July 2017 and continues to operate in a near-perfect geostationary orbit some 35,800 kilometers above the equator. Registered under NORAD catalog identifier 42818 and carrying the international designator 2017-041A, the spacecraft represents a significant piece of commercial telecommunications infrastructure serving users across multiple coverage regions.

Mission and Purpose

IS-35e belongs to Intelsat's high-throughput satellite (HTS) category, a class of spacecraft designed to deliver substantially greater data capacity than conventional fixed-beam satellites by employing multiple narrow spot beams that reuse available spectrum across a wide service area. This architectural approach allows a single satellite to offer throughput levels that would have been impossible with earlier generations of geostationary communications platforms, making HTS satellites particularly well suited for broadband internet delivery, cellular network backhaul, maritime and aeronautical connectivity, and enterprise data services.

Intelsat has historically positioned its HTS fleet under the Epic branding, and IS-35e fits within that product family, intended to augment coverage and capacity for regions that depend heavily on satellite connectivity. The satellite's high-capacity design makes it especially relevant for operators seeking to meet the growing demand for broadband access in areas where terrestrial infrastructure remains limited or economically impractical to deploy. This includes portions of the Americas, the Atlantic region, and other areas within the satellite's coverage footprint.

The specific mission parameters held in the LowEarth catalog list the mission type and current status as unknown based on available catalog data, meaning that granular operational details — such as the precise frequency bands in active use, current beam configurations, or active service agreements — are not publicly recorded in the tracking database. What is well established is that the satellite was designed and contracted for commercial telecommunications purposes by one of the industry's most established operators.

Orbit and Tracking

IS-35e occupies a geostationary orbit, the highly specialized circular orbit roughly 35,800 kilometers above Earth's equator in which a satellite's orbital period matches the planet's rotation. At this altitude, the spacecraft appears essentially stationary relative to ground-based antennas and users, which is a fundamental requirement for the type of continuous, fixed-link communications services it provides.

The orbital parameters cataloged for IS-35e confirm the near-ideal geostationary geometry: an apogee of 35,802 kilometers, a perigee of 35,788 kilometers, an inclination of exactly 0.0 degrees, and an orbital period of 1,436.2 minutes. The extremely small difference between apogee and perigee — a spread of only 14 kilometers — indicates a very nearly circular orbit, and the zero-degree inclination confirms the satellite is tracking precisely over the equatorial plane. These figures are characteristic of a well-controlled operational geostationary satellite that is being actively maintained through regular station-keeping maneuvers.

The orbital period of 1,436.2 minutes is effectively synchronous with Earth's sidereal rotation, which is what produces the stationary appearance from the ground. This makes IS-35e invisible to the kind of casual naked-eye satellite spotting that LEO objects permit — it does not cross the sky in a matter of minutes, but instead hangs at a fixed point in the celestial sphere. To observe it, one would require optical aid and precise pointing coordinates derived from its cataloged orbital elements.

NORAD and the 18th Space Control Squadron maintain custody of the object under catalog number 42818, and its two-line element (TLE) sets are regularly updated and distributed through space surveillance networks. Because the satellite is in a controlled geostationary orbit with station-keeping active, its position is highly predictable and the TLE data tends to remain accurate for extended periods compared with lower-altitude objects subject to significant atmospheric drag or perturbation.

Design and Operator

IS-35e was designed and manufactured by Boeing Satellite Development Center — the commercial satellite manufacturing arm of Boeing — on the 702MP satellite bus. The 702MP (Medium Power) variant of Boeing's long-serving 702 platform is a well-proven commercial chassis that supports a wide range of payload configurations. It uses a combination of xenon-ion propulsion for station-keeping and electric or bipropellant systems depending on mission requirements. The platform is recognized for its ability to accommodate high-power payloads while maintaining competitive mass and fuel efficiency, qualities that are essential for high-throughput satellite designs.

The satellite has a launch mass of 6,761 kilograms, which places it firmly in the heavy category for commercial geostationary satellites. This mass reflects the substantial propellant load required for geostationary transfer orbit insertion and years of on-orbit station-keeping, as well as the considerable payload hardware needed to support high-throughput communications operations.

Intelsat, the operator and owner of IS-35e, is headquartered in Luxembourg and operates one of the largest commercial satellite fleets in the world. The company traces its origins to the International Telecommunications Satellite Consortium, an intergovernmental organization founded in the 1960s to provide global satellite communications infrastructure. Following privatization in the early 2000s, Intelsat became a commercial entity. It has continued to invest in next-generation HTS capacity to compete in a market increasingly shaped by demand for broadband data rather than the traditional video distribution and voice services that defined the industry's early decades.

IS-35e was launched on July 4, 2017, at 20:00 Eastern Daylight Time, lifting off into space and subsequently maneuvering to its geostationary orbital slot. The launch vehicle and launch site details are not reproduced here beyond what is confirmed in the catalog record, which identifies the launch date and object classification but does not specify additional launch infrastructure details. The satellite received the international designator 2017-041A, indicating it was the first object associated with the 41st launch event of 2017 under the international cataloging convention.

Current Status

As of the most recent catalog data reflected in this record, IS-35e remains in orbit and has not undergone atmospheric reentry or deorbit. No decay or reentry date has been recorded, consistent with an operational or post-operational spacecraft maintained at geostationary altitude. Satellites at this orbit are not subject to the atmospheric drag that would naturally decay a low-Earth orbit spacecraft over years or decades; without active deorbit maneuvers, a geostationary satellite will remain in orbit indefinitely, or until it is raised into a graveyard orbit several hundred kilometers above the geostationary belt at the end of its operational life.

The mission status is listed in the catalog as unknown, which reflects the limits of publicly available tracking data rather than any confirmed anomaly or failure. Commercial operators do not always publish real-time operational status for individual satellites, and catalog databases like the one maintained for this record rely primarily on orbital observation data rather than direct telemetry from operators. The spacecraft's continued presence in a well-defined geostationary slot, with no noted deorbit event, is consistent with continued operation or at minimum a controlled post-operational disposition.

Given the 6,761-kilogram launch mass and the typical design parameters of Boeing 702MP satellites, IS-35e would have been designed for a service life measured in roughly fifteen years or more, with on-board propellant budgeted accordingly. This means the satellite, launched in 2017, would be expected to remain a viable platform through the mid-2030s under normal operational conditions, though specific fuel reserves and operational decisions are internal to Intelsat and not reflected in public catalog records.

The satellite contributes to the broader Intelsat fleet capacity that underpins a wide range of telecommunications services globally. HTS platforms of its type have become a structural element of the commercial satellite industry, filling a role that bridges the gap between the legacy capacity of conventional wide-beam satellites and the emerging low-Earth orbit broadband constellations that have drawn considerable attention in recent years. Within the geostationary arc, IS-35e represents the kind of high-density capacity investment that defined the mid-2010s generation of commercial satellite procurement, when operators across the industry raced to deploy HTS assets in response to surging data demand from mobility, broadband, and enterprise markets.

For tracking purposes, IS-35e's orbital elements are publicly accessible through standard space surveillance data sources, and its cataloged position in the geostationary belt can be used to point ground-based receivers or observation instruments with precision. Unlike satellites in lower orbits, its apparent position changes only very slowly from any given ground location, making it a stable reference point in the sky for fixed-dish installations and a straightforward object to locate for those with the appropriate equipment.