MUOS-4 – Atlas V 551 (AV-056) – Канаверал SLC-41 - 02.09.2015 10:18 UTC

[che wi]

James Dean ‏@flatoday_jdean  1m ago

#Atlas V countdown has entered unplanned hold to work issue with preparations to fuel Centaur upper stage with liquid hydrogen.

[che wi]

James Dean ‏@flatoday_jdean  1m ago

Countdown has resumed, launch team proceeding with chilldown of #Atlas Centaur upper stage's liquid hydrogen lines.

[Pirat5]

0931 GMT = 1231msk
The liquid hydrogen tank in the Centaur upper stage just reached the 96 percent level. Topping is now beginning

[che wi]

Трансляция:

http://www.ulalaunch.com/webcast.aspx
http://original.livestream.com/spaceflightnow

[che wi]

[Pirat5]

0933 GMT   The vehicle is fully fueled.

0950 GMT      Weather remains GO for liftoff based on the current conditions and expected to stay favorable for an 6:18 a.m. EDT launch today. ( = 1018GMT = 1318msk)

0959 GMT      The MUOS 4 satellite is switching to internal power for launch

и статистика:
Today marks the 56th flight for Atlas 5, born of the Air Force's competition to develop next-generation Evolved Expendable Launch Vehicles. In its previous 55 missions since debuting in August 2002, the Atlas 5 has flown 21 flights dedicated to the Defense Department, 12 for NASA, 11 with spy satellites for the National Reconnaissance Office. and 11 commercial missions with communications and Earth-observing spacecraft.

[Pirat5]

1006 GMT      T-minus 4 minutes and holding. The countdown has entered the planned 8-minute hold to give the launch team a chance to review all systems before pressing ahead with liftoff.

[che wi]

[Pirat5]

[/li]
• The 638th launch for Atlas program since 1957
• The 344th Atlas launch from Cape Canaveral
• The 227th mission of a Centaur upper stage
• The 204th use of Centaur by an Atlas rocket
• The 46th Atlas 5 launch from Cape Canaveral
• The 460th production RL10 engine to be launched
• The 5th RL10C-1 engine launched
• The 62nd flight of the RD-180 main engine
• The 56th launch of an Atlas 5 since 2002
• The 22nd Air Force mission for an Atlas 5
• The 86th Evolved Expendable Launch Vehicle flight
• The 99th United Launch Alliance flight overall
• The 48th Atlas 5 under United Launch Alliance
• The 20th 500-series flight of the Atlas 5
• The 6th Atlas 5 to fly in the 551 configuration
• The 4th MUOS satellite to launch
• The 5th Atlas 5 launch of 2015
  

[Pirat5]

1311msk      Polling of the team by Atlas launch conductor just occurred. All systems are reported GO for flight.

[che wi]

- 1 мин.

[che wi]

Пошла.

[che wi]

Отделение бустеров.

[che wi]

Сброс ГО.

[che wi]

Отделенеи 1 ст.

[che wi]

[che wi]

2ч. 45 мин. до отделения КА.

[Pirat5]

1322      T+plus 4 minutes, 46 seconds. Centaur has ignited!
1326   T+plus 8 minutes. Vehicle traveling at 14,869 mph

[Pirat5]

1330   T+plus 12 minutes, 31 seconds. MECO 1. 

[Pirat5]

Centaur is now orbital