Ekspress-AM4R (russian: Экспресс-АМ4Р meaning ''Express-AM4R'') was a Russian

communications satellite A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Ear ...

intended for operation by the Russian Satellite Communications Company (RSCC). Constructed as a replacement for Ekspress-AM4, which was left unusable after the

upper stage A multistage rocket or step rocket is a launch vehicle that uses two or more rocket ''stages'', each of which contains its own engines and propellant. A ''tandem'' or ''serial'' stage is mounted on top of another stage; a ''parallel'' stage ...

of the

launch vehicle A launch vehicle or carrier rocket is a rocket designed to carry a payload (spacecraft or satellites) from the Earth's surface to outer space. Most launch vehicles operate from a launch pads, supported by a launch control center and syste ...

carrying it malfunctioned, Ekspress-AM4R was also lost due to a launch failure.

Satellite description

Astrium, which had become part of

Airbus Defence and Space Airbus Defence and Space is the division of Airbus SE responsible for the development and manufacturing of the corporation's defence and space products, while also providing related services. The division was formed in January 2014 during the ...

by the time of the satellite's launch, constructed Ekspress-AM4R, which was based on the Eurostar-3000

satellite bus A satellite bus (or spacecraft bus) is the main body and structural component of a satellite or spacecraft, in which the payload and all scientific instruments are held. Bus-derived satellites are opposed to specially produced satellites. Bus- ...

. It was identical in design to Ekspress-AM4, with a mass of and a planned operational lifespan of fifteen years. The satellite carried sixty-three transponders: thirty operating in the C-band of the electromagnetic spectrum, twenty eight in the Ku-band, two in the Ka-band and three in the L-band. It was to have been the largest and most powerful satellite in the

Ekspress Ekspress (russian: Экспресс 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 satell ...

constellation.

Launch

Khrunichev State Research and Production Space Center The Khrunichev State Research and Production Space Center (''Государственный космический научно-производственный центр (ГКНПЦ) имени М. В. Хру́ничева'' in Russian) is ...

was contracted to launch Ekspress-AM4R, using a

Proton-M The Proton-M, (Протон-М) GRAU index 8K82M or , is an expendable Russian heavy-lift launch vehicle derived from the Soviet-developed Proton. It is built by Khrunichev, and launched from sites 81 and 200 at the Baikonur Cosmodrome i ...

/ Briz-M launch vehicle - the same configuration that had failed to deploy Ekspress-AM4. The launch took place from Site 200/39 at the

Baikonur Cosmodrome ''Baiqoñyr ğaryş ailağy'' rus, Космодром Байконур''Kosmodrom Baykonur'' , image = Baikonur Cosmodrome Soyuz launch pad.jpg , caption = The Baikonur Cosmodrome's " Gagarin's Start" Soyu ...

, at 21:42:00 UTC on 15 May 2014. Shortly after launch the launch vehicle was reported to have encountered a problem during third stage flight, and as a result the satellite failed to reach orbit.

References

{{Orbital launches in 2014 Spacecraft launched in 2014 Satellite launch failures Ekspress satellites 2014 in Russia Satellites using the Eurostar bus