SES-9

SES-9 is a geostationary communications satellite operated by the Luxembourg-based satellite fleet operator SES S.A. Built by Boeing Satellite Development Center and launched in early March 2016, the spacecraft occupies a fixed position above the equator and forms part of SES's broad portfolio of commercial telecommunications infrastructure. With a launch mass of 5,330 kg, it ranks among the heavier commercial communications satellites placed in orbit during the mid-2010s. The satellite carries the NORAD catalog identifier 41380 and the international COSPAR designator 2016-013A, and as of the time of writing it remains fully in orbit with no reentry recorded.

Mission and Purpose

SES-9 was procured by SES S.A. to augment and eventually replace capacity that the operator had been providing over the Asia-Pacific and South Asian regions. SES is a global satellite operator headquartered in Luxembourg that maintains one of the world's largest fleets of geostationary and medium-Earth-orbit spacecraft, delivering broadband, broadcasting, and data connectivity services to customers ranging from governments and broadcasters to maritime and aviation clients.

The specific payload configuration and transponder details of SES-9 are not fully enumerated in the public catalog record, and the mission type and current operational status are not formally documented in open tracking databases. What is well established is that the satellite operates in the Ku- and Ka-band frequency ranges typical of SES's fleet, supporting commercial communications traffic across its coverage footprint. Geostationary satellites of this class commonly provide direct-to-home television broadcasting, broadband internet trunking, and enterprise data networking — services consistent with SES's commercial model, though the precise service breakdown for SES-9 specifically is not independently verified here.

The satellite was launched from Space Launch Complex 40 at Cape Canaveral, Florida, aboard a Falcon 9 Full Thrust rocket operated by SpaceX. The liftoff took place on the evening of March 3, 2016, Eastern Standard Time — corresponding to March 4, 2016 in Coordinated Universal Time. The mission attracted considerable public attention at the time not only for its commercial payload but also for SpaceX's attempt to recover the first stage booster. That recovery attempt, conducted under unusually demanding propellant constraints imposed by the high-energy trajectory required to deliver SES-9 toward geostationary transfer orbit, was only partially successful: the booster reached the autonomous drone ship but landed hard and was not preserved. Nevertheless, the launch itself was fully successful, delivering SES-9 on its intended trajectory.

Orbit and Tracking

SES-9 resides in a geostationary orbit, one of the most precisely defined orbital regimes in operational use. Geostationary orbit places a satellite at an altitude where its orbital period matches the rotational period of the Earth, causing the spacecraft to appear stationary relative to a fixed point on the ground. This characteristic makes geostationary satellites uniquely valuable for communications and broadcasting, since ground-based antennas can point at a fixed position in the sky without requiring active tracking.

The orbital parameters recorded for SES-9 confirm a nearly circular, equatorial orbit. The apogee is listed at 35,803 km and the perigee at 35,786 km, a difference of only 17 km that reflects the very slight residual ellipticity present in any real-world geostationary insertion. The orbital inclination is 0.0°, meaning the satellite's orbital plane is aligned with Earth's equatorial plane to within the precision of current measurements. The orbital period is 1,436.1 minutes — approximately 23 hours and 56 minutes — which corresponds closely to one sidereal day, the fundamental condition for maintaining a geostationary station.

In the NORAD catalog, SES-9 is classified as a payload object, distinguishing it from the rocket bodies and debris fragments that may accompany a given launch event. Tracking is maintained continuously by the U.S. Space Surveillance Network, and two-line element sets derived from radar observations are regularly updated and made available to the public. Because geostationary satellites move very little relative to the Earth's surface, their orbital elements change slowly compared with those of low-Earth-orbit objects, and conjunction assessments for GEO assets tend to focus on proximity to neighboring satellites within the tightly managed geostationary belt rather than on ground-track drift.

At the end of its operational life, SES-9 is expected — in accordance with standard industry practice and international guidelines — to be raised into a graveyard orbit several hundred kilometers above the geostationary belt, where it will not interfere with operational spacecraft. No reentry into Earth's atmosphere is anticipated or planned on any near-term timescale.

Design and Operator

SES-9 was manufactured by Boeing Satellite Development Center, the commercial satellite manufacturing arm of Boeing, based in El Segundo, California. Boeing has produced numerous geostationary communications satellites over several decades, and its BSS-702 platform family has been a common choice for high-power, long-life commercial missions. While the specific bus designation for SES-9 is not repeated from the catalog record here, Boeing's GEO satellite buses are generally engineered for service lives measured in fifteen years or more and are designed to accommodate large solar arrays and high-capacity transponder suites.

The satellite's launch mass of 5,330 kg places it firmly in the heavyweight class of commercial GEO spacecraft. A significant portion of that mass at launch consists of propellant used for apogee engine firing, on-orbit station keeping over the operational lifetime, and eventual end-of-life disposal maneuvers. Once that propellant is expended, the dry mass of the spacecraft is considerably lower, but the launch figure of 5,330 kg is the standard reference point used in catalog and manifest records.

SES S.A., the operating entity, was founded in 1985 and launched its first satellite in 1988. It has since grown into one of the two or three largest commercial satellite fleet operators in the world by number of spacecraft and orbital slots managed. SES operates satellites from numerous geostationary positions distributed around the equatorial arc, as well as a medium-Earth-orbit constellation. The company is publicly listed and headquartered in Betzdorf, Luxembourg, with operations, engineering, and customer service offices distributed globally. SES satellites serve customers in more than 110 countries, and the company has historically been one of Boeing's significant repeat customers in the commercial satellite market.

Current Status and Significance

SES-9 has been in orbit since its March 2016 launch and, according to tracking records, remains in orbit with no decay event recorded. For a geostationary communications satellite of its generation, this is entirely expected: well-maintained GEO satellites routinely operate for fifteen years or longer before being retired to graveyard orbit, and SES-9 is still within what would typically be considered the active portion of its design life.

Beyond its function as a commercial telecommunications asset, SES-9 holds a secondary place in the history of commercial launch vehicles. Its launch was one of the early demonstrations of the operational capabilities of the Falcon 9 Full Thrust variant, which represented a significant uprating over earlier Falcon 9 versions. The high-energy geostationary transfer trajectory demanded for SES-9 — which required the Falcon 9 upper stage to perform a particularly demanding series of burns — left the first-stage booster with minimal residual propellant for the recovery attempt, making it one of the more challenging booster return scenarios that SpaceX had attempted up to that point. While the booster was not successfully recovered intact, the attempt contributed to the iterative learning process that would lead SpaceX to reliable booster landings on subsequent missions.

For satellite tracking purposes, SES-9 represents a canonical example of an operational geostationary payload: a massive, long-lived commercial spacecraft parked at a fixed equatorial longitude, invisible to the naked eye under normal circumstances but readily identified in telescopic surveys and radar tracking data. Its stable orbit and well-characterized radar cross-section make it a consistent presence in the geostationary catalog, and its NORAD ID 41380 and COSPAR designator 2016-013A serve as the authoritative references for any observer or researcher wishing to correlate ground observations or antenna-pointing data with catalog entries.

The satellite's near-circular orbit at roughly 35,800 km altitude, its zero-degree inclination, and its period of just over 1,436 minutes collectively define it as a textbook geostationary object — a spacecraft locked in synchrony with the rotating Earth below, delivering connectivity services across a wide geographic footprint while remaining, from any fixed ground station within its coverage arc, perpetually overhead.