NSS-806 (New Skies Satellite 806), before Intelsat 806, is a

communications satellite A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a Transponder (satellite communications), transponder; it creates a communication channel between a source transmitter and a Rad ...

originally operated by

Intelsat Intelsat S.A. (formerly Intel-Sat, Intelsat) is a Luxembourgish-American multinational satellite services provider with corporate headquarters in Luxembourg and administrative headquarters in Tysons, Virginia, United States. Originally formed ...

. Launched in 1998 it was operated in

geostationary orbit A geostationary orbit, also referred to as a geosynchronous equatorial orbit''Geostationary orbit'' and ''Geosynchronous (equatorial) orbit'' are used somewhat interchangeably in sources. (GEO), is a circular orbit, circular geosynchronous or ...

at a longitude of 47 degrees west for around 15 years. It is currently located in the orbital position of 47.5 degrees west longitude, was initially operated by

, orbited at 40.5 degrees west, and was purchased by

SES World Skies SES World Skies was a short lived company formed as a result of the merger between the two SES subsidiaries, ''SES Americom'' and ''SES New Skies''. The company was merged into its parent company, SES in 2011. History SES Americom SES ...

(a subsidiary of

SES SES, S.E.S., Ses and similar variants can refere to: Business and economics * Socioeconomic status * Scottish Economic Society, a learned society in Scotland * SES, callsign of the TV station SES/RTS (Mount Gambier, South Australia) * SES, a ...

Satellite

NSS-806 is equipped with 28

transponder In telecommunications, a transponder is a device that, upon receiving a signal, emits a different signal in response. The term is a blend of ''transmitter'' and ''responder''. In air navigation or radio frequency identification, a flight trans ...

s in C band and 3 in

Ku band The Ku band () is the portion of the electromagnetic spectrum in the microwave range of frequencies from 12 to 18 gigahertz (GHz). The symbol is short for "K-under" (originally ), because it is the lower part of the original NATO K ban ...

, making transmissions for the

Americas The Americas, sometimes collectively called America, are a landmass comprising the totality of North America and South America.''Webster's New World College Dictionary'', 2010 by Wiley Publishing, Inc., Cleveland, Ohio. When viewed as a sing ...

and parts of

Europe Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...

. In order to receive the signal it requires a monofocal antenna (LNBF antenna in the center), a LNBF for C band (5150

MHz The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), often described as being equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose formal expression in terms of SI base u ...

) and a digital receiver compatible with C band. The NSS-806 emits its signal in circular polarization.

Launch

The launch of NSS-806 made use of an

Atlas II Atlas II was a member of the Atlas family of launch vehicles, which evolved from the successful Atlas missile program of the 1950s. The Atlas II was a direct evolution of the Atlas I, featuring longer first-stage tanks, higher-perfor ...

rocket flying from

Cape Canaveral Air Force Station Cape Canaveral Space Force Station (CCSFS) is an installation of the United States Space Force's Space Launch Delta 45, located on Cape Canaveral in Brevard County, Florida. Headquartered at the nearby Patrick Space Force Base, the sta ...

Florida Florida ( ; ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders the Gulf of Mexico to the west, Alabama to the northwest, Georgia (U.S. state), Georgia to the north, the Atlantic ...

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

. The launch took place at 00:21 UTC on February 28, 1998, with the spacecraft entering a

geosynchronous transfer orbit In space mission design, a geostationary transfer orbit (GTO) or geosynchronous transfer orbit is a highly elliptical type of geocentric orbit, usually with a perigee as low as low Earth orbit (LEO) and an apogee as high as geostationary orbit ...

. NSS-806 subsequently fired its apogee motor to achieve

Health and replacement

In July 2017, seven years past its 12-year intended design life, NSS-806 lost the use of 12 of its 39 transponders. NSS-806's replacement,

SES-14 SES-14 is a geostationary communications satellite operated by SES at 47.5° West, replaces NSS-806, and designed and manufactured by Airbus Defence and Space. The satellite launched on 25 January 2018 at 22:20 UTC along with the Global-scal ...

, was scheduled to be launched in first quarter of 2018 on a

SpaceX Space Exploration Technologies Corp., commonly referred to as SpaceX, is an America, American space technology company headquartered at the SpaceX Starbase, Starbase development site in Starbase, Texas. Since its founding in 2002, the compa ...

Falcon 9 Falcon 9 is a Reusable launch system#Partial reusable launch systems, partially reusable, two-stage-to-orbit, medium-lift launch vehicle designed and manufactured in the United States by SpaceX. The first Falcon 9 launch was on June 4, 2010, an ...

, and SES predicted that the transponder failure would result in a revenue loss of between 7 and 9 million euros. The following month, SES arranged to swap flights so that SES-12 would launch in January 2018 on an

Ariane 5 Ariane 5 is a retired European heavy-lift space launch vehicle operated by Arianespace for the European Space Agency (ESA). It was launched from the Guiana Space Centre (CSG) in French Guiana. It was used to deliver payloads into geostationar ...

, with

SES-12 SES-12 is a geostationary communications satellite operated by SES. Satellite description SES-12 was designed and manufactured by Airbus Defence and Space. It has a mass of and has a design life of at least 15 years. Launch SES-12 was su ...

, originally scheduled for that flight, now launching on the Falcon 9 later in Q1. SES-14 was launched from

Kourou Kourou (; ) is a commune in French Guiana, an overseas region and department of France in South America. Kourou is famous for being the location of the Guiana Space Centre, the main spaceport of France and the European Space Agency (ESA). It ...

on 25 January 2018, but was placed in an incorrect orbit due to a launch vehicle anomaly. SES reported that the all-electric SES-14 would take four more weeks than originally planned to reach its operating orbit, but that the satellite was healthy and was expected to meet its designed life time. SES-14's in-service date, originally set for July 2018, was expected to be pushed back until at least August 2018.

Technical details

References

{{Orbital launches in 1998 Intelsat satellites SES satellites Spacecraft launched in 1998 Communications satellites in geostationary orbit