Ekspress AM4R


Ekspress AM4R
Mission typeCommunications
Mission duration15 years (planned)
Failed to orbit
Spacecraft properties
BusEurostar 3000
ManufacturerAirbus Defence and Space
Launch mass5,775 kilograms (12,732 lb)[1]
Start of mission
Launch date15 May 2014, 21:42 (2014-05-15UTC21:42Z) UTC[2]
Launch siteBaikonur 200/39
Orbital parameters
Reference systemGeocentric
RegimeGeosynchronous planned
Failed to orbit
Longitude80° East
Inclination0 degrees
Period24 hours
Band30 C band
28 Ku band
2 Ka band
3 L band

Ekspress AM4R (Russian: Экспресс-АМ4Р meaning Express AM4R)[3] was a Russian communications satellite intended for operation by the State Company for Satellite Communications. Constructed as a replacement for Ekspress AM4, which was left unusable after the upper stage of the rocket carrying it malfunctioned, Ekspress AM4R was also lost due to a launch failure.[4]

Astrium, which had become part of Airbus Defence and Space by the time of the satellite's launch, constructed Ekspress AM4R, which was based on the Eurostar 3000 satellite bus.[5] It was identical in design to Ekspress AM4, with a mass of 5,775 kilograms (12,732 lb) 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 constellation.[1]

Khrunichev was contracted to launch Ekspress AM4R, using a Proton-M/Briz-M rocket - the same configuration that had failed to deploy Ekspress AM4. The launch took place from Site 200/39 at the Baikonur Cosmodrome, at 21:42 UTC on 15 May 2014. Shortly after launch the rocket was reported to have encountered a problem during third stage flight, and as a result the satellite failed to reach orbit.[2]


  1. ^ a b Krebs, Gunter. "Ekspress-AM 4, 4R". Gunter's Space Page. Retrieved 26 May 2014.
  2. ^ a b Graham, William; Bergin, Chris (15 May 2014). "Russian Proton-M suffers failure during Ekspress-AM4R launch". NASASpaceflight.com. Retrieved 26 May 2014.
  3. ^ "Ракета "Протон-М" для запуска "Экспресс-АМ4Р" доставлена на Байконур". RIA Novosti. 28 February 2014. Retrieved 26 May 2014.
  4. ^ Zak, Anatoly. "Proton fails again with Ekspress satellite". Archived from the original on 27 May 2014. Retrieved 26 May 2014.
  5. ^ "Express AM4R and Express AM7". Astrium. Archived from the original on 3 April 2013. Retrieved 26 May 2014.