Lancement Proton-M / Ekspress AM4 - 18 août 2011 et... perte du satellite

Launched at Baikonur launch campaign "Proton" / "Express AM-4"
:: 07/18/2011

July 18 in the assembly and test building site 92A-50 Baikonur calculations Federal State Unitary Enterprise "GKNPTs them. Khrunichev "and FSUE TsENKI - Space Center" South "began to work with the carrier rocket" Proton-M "and the booster block" Breeze-M ", intended for launching into orbit of the Russian telecommunication satellite" Express AM-4 ".
Are enable validation control rocket "Proton-M", performed comprehensive testing of the control system booster "Briz-M".
Today, at a filling station site 31 space center staff calculations have begun to prepare equipment and facilities for the upcoming refueling station components fuel tanks, high pressure booster "Briz-M."
satellite "Express AM-4" is scheduled to deliver at the launch site approximately one week.
Start space rocket "Proton-M" with the upper stage "Briz-M" and the Russian satellite "Express AM 4 "is scheduled for August 18.

The State Commission adopted a decision on readiness ILV "Proton-M" for fueling
:: 17/08/2011

At a meeting of the Baikonur launch site of the State Commission, which reviewed the results of tests of space rocket "Proton-M" with the upper stage "Briz-M" and the spacecraft "Express-AM4" at the launch complex.

After hearing the reports of supervisors, the State Commission adopted a decision on readiness for space rocket fuel propellants.

According to the prelaunch schedule of specialists of Russian Space Agency began operations on refueling ILV "Proton-M".

Start ILV "Proton-M" with the upper stage "Briz-M" and the spacecraft "Express-AM4" to provide telecommunications services users in Russia and CIS countries is scheduled for 01.25 Moscow time on August 18.

Press Service of the Russian Space Agency

Yantar a écrit:Le contact a été perdu avec le lanceur entre le 4ème et 5ème phase d'allumage de l'étage supérieur Breeze M.

spaceX a écrit:Quel est le taux de reussite (ou d'echec) de l'etage Breeze-M?

Mustard a écrit:
Ensuite, un 5eme allumage de 7mn à l'apogée à pour tache de circulariser l'orbite, pour devenir géostationnaire

Azathoth31 a écrit:

Mustard a écrit:
Ensuite, un 5eme allumage de 7mn à l'apogée à pour tache de circulariser l'orbite, pour devenir géostationnaire

Non, ce serait trop beau :)
Après le 5è allumage Briz-M, le satellite est normalement injecté sur une orbite GTO
Après, c'est au fournisseur du satellite (EADS Astrium dans le cas d'Express-AM4) de ramener le satellite sur l'orbite GEO

nikolai39 a écrit:Je viens de réaliser qu'il s'agissait du 50ème vol du Briz-M !

nikolai39 a écrit:Selon RIA Novosti, le NORAD ne détecte ni le satellite, ni le Briz-M. Cela signifierait qu'ils sont rentrés dans l'atmosphère.

http://fr.rian.ru/science/20110818/190540376.html

Source: http://www.nasaspaceflight.com/2011/08/proton-m-launches-russias-ekspress-am4-communications-satellite/
On a typical mission, the Briz-M would ignite for its first burn about 92 seconds after separating from the third stage. This burn would last about four and a half minutes, completing insertion into a low Earth parking orbit. About 51 minutes later, the second burn would begin as the Briz-M approached the ascending node of its parking orbit, raising the perigee into a new apogee at an altitude of around 5,000 kilometres.