Ekspress-AM4 was a Russian

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 ...

placed into the wrong

orbit In celestial mechanics, an orbit (also known as orbital revolution) is the curved trajectory of an object such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an ...

from a faulty

Briz-M The Briz-K, Briz-KM and Briz-M ( meaning ''Breeze-K, KM and M'') are Russian liquid-propellant rocket orbit insertion upper stages manufactured by Khrunichev State Research and Production Space Center and used on the Proton-M and Angara A5. T ...

rocket stage. This satellite was to be part of the

Ekspress Ekspress ( meaning Express), is a series of geostationary communications satellites owned by Russian Satellite Communications Company (RSCC). The first satellite of this kind was launched on 13 October 1994. The satellites are produced by the ...

series of

geostationary 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 geosynchronous orbit in altitud ...

communications satellites owned by

Russian Satellite Communications Company Federal State Unitary Enterprise State Transport Company Rossiya, Federal State Unitary Enterprise Communications satellite, Satellite Communications () or Russian Satellite Communications Company is the main state operator of communications s ...

(RSCC). Proposals were made to reposition the satellite to provide

broadband In telecommunications, broadband or high speed is the wide-bandwidth (signal processing), bandwidth data transmission that exploits signals at a wide spread of frequencies or several different simultaneous frequencies, and is used in fast Inter ...

services to

Antarctica Antarctica () is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean (also known as the Antarctic Ocean), it contains the geographic South Pole. ...

, but ultimately the decision was made to de-orbit the satellite. On 28 March 2012, the satellite splashed into the

Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...

Satellite description

The total mass of the Ekspress-AM4 satellite was , and the

satellite A satellite or an artificial satellite is an object, typically a spacecraft, placed into orbit around a celestial body. They have a variety of uses, including communication relay, weather forecasting, navigation ( GPS), broadcasting, scient ...

had 63

transponders 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 ...

. The onboard antennas were capable of broadcasting in the C-band,

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 band ...

L-band The L band is the Institute of Electrical and Electronics Engineers (IEEE) designation for the range of Frequency, frequencies in the radio spectrum from 1 to 2 gigahertz (GHz). This is at the top end of the ultra high frequency (UHF) band, at t ...

, and

Ka-band The Ka band (pronounced as either "kay-ay band" or "ka band") is a portion of the microwave part of the electromagnetic spectrum. The designation "Ka-band" is from Kurz-above, which stems from the German word ''kurz,'' meaning "short". There ...

. The satellite's orbit was measured at 695 by 20239 km altitude, with an inclination orbit of 51.1°. Though the satellite was placed in the wrong orbit, there was no damage to the satellite, meaning that it became the subject of numerous

reuse Reuse is the action or practice of using an item, whether for its original purpose (conventional reuse) or to fulfill a different function (creative reuse or repurposing). It should be distinguished from recycling, which is the breaking down of ...

proposals.

Launch

The Ekspress-AM4 satellite was launched on 17 August 2011 on a Russian

Proton-M The Proton-M, (Протон-М) GRAU index 8K82M or , is an Expendable launch system, expendable Russian heavy-lift launch vehicle derived from the Soviet Union, Soviet-developed Proton (rocket family), Proton. It is built by Khrunichev State R ...

launch vehicle A launch vehicle is typically a rocket-powered vehicle designed to carry a payload (a crewed spacecraft or satellites) from Earth's surface or lower atmosphere to outer space. The most common form is the ballistic missile-shaped multistage ...

from

Kazakhstan Kazakhstan, officially the Republic of Kazakhstan, is a landlocked country primarily in Central Asia, with a European Kazakhstan, small portion in Eastern Europe. It borders Russia to the Kazakhstan–Russia border, north and west, China to th ...

, which included a Briz-M upper stage. It was just after launch that the Briz-M stage did not separate from the Ekspress satellite, causing it to be placed into the wrong orbit. Contact was lost with the satellite and with its attached Briz M upper stage about six hours after the pair were launched. Telemetry stopped either during or after the fourth of five planned Briz M upper stage burns planned to occur during a nine-hour maneuver designed to insert the satellite into a geosynchronous transfer orbit (GTO).

Reuse proposals

One of the most notable reuse proposals came from a company called Polar Broadband Systems, which was established in December 2011. Its objectives were to submit proposals for the reuse of semi-retired and retired satellites for use with communications over the Antarctic. The company notes that it would not have been feasible to build a dedicated satellite for the region as the population would not justify the expense, however Ekspress-AM4 would suffice as it could have been maneuvered into the required orbit. There was enough fuel on board for it to be operational for ten years, with giving the Antarctic region 16 hours of broadband access a day. Similarly, Australian company Antarctic Broadband proposed a similar scheme for Antarctic communications, however neither were successful.

Deorbited

Dennis Pivnyuk,

chief financial officer A chief financial officer (CFO) is an officer of a company or organization who is assigned the primary responsibility for making decisions for the company for projects and its finances; i.a.: financial planning, management of financial risks, ...

of the Russian Satellite Communications Company, informed on 15 March 2012 that the satellite would be decommissioned and deorbited. He stated that the descent phase would start on 20 March 2012, with the spacecraft reentering over the Pacific Ocean around 26 March 2012. The spacecraft was destroyed during reentry on 28 March 2012."Dead Russian Satellite to Fall From Space"
Retrieved 1 April 2012

References

External links

IMS
Official provider's site {{Orbital launches in 2011 Ekspress satellites Satellite launch failures Spacecraft launched in 2011 Spacecraft which reentered in 2012 2011 in Russia Satellites using the Eurostar bus Space accidents and incidents in Kazakhstan