Detailed Countdown Timeline

All times EDT.  08/04&08/05
T- Event EDT
12:00 Verfiy Countdown Clock is in proper Configuration 10:54PM
  Countdown Begins  
  MLP Clear of non essential personnel  
  Launcxh Pad Environmental Control System Prep  
  Nitrogen Purge  
  Weather Briefing  
  Search Light Power Up  
  SLC41 warning lights on  
08:30 MLP to Launch Pad 02:24AM
  MLP Hard Down and Securing  
  Atlas System Start in preparation for Tanking  
  Instrument Checks  
  Lox System Preparations  
  Gas Detection System Preparations  
  Internal Battery Checks  
  LH2 System Preparations  
  SLC Clear of all Personnel  
 02:00 Launch Conducter Briefing on Vehicle Conditions 08:54AM
 HOLDING GO/No GO for Tanking Poll  
30-Min Hold Pre-Test Tanking Briefing  
02:00 Centaur LOX Tank Chilldown 09:24AM
COUNTING Atlas LOX Vault & MLP Chilldown  
  Centaur Helium Storage Bottle Pressurization  
  Atlas Pressure Vessels Charge  
  Atlas V RP-1 Fuel Tank Press  
01:55 Safe Arm Device Cycle Test 09:29AM
01:50 Centaur LOX Transfer Line Chilldown 09:34AM
01:43 Centaur LOX Tanking begins 09:39AM
01:33 Centaur LH2 Tank Press to Chilldown Level 09:51AM
01:30 Atlas V LOX Tanking begins 09:54AM
01:25 Centaur LH2 Transfer Lines Chilldown 09:59AM
01:00 Centaur Engine Chilldown 10:24AM
00:55 Flight Control Final Preparations for Hyd Press 10:29AM
00:45 Main Engine Pneumatic System Press to Flt Level 10:39AM
00:16 Fuel Fill Sequence Initiation 11:08AM
00:10 Weather Briefing 11:14AM
00:05 Fuel Fill Sequence Complete 11:19AM
  Water Deluge System actuation Pressure Adjust  
  Cenataur LOX at Flight Level  
  Centaur LH2 at Flight Level  
 00:04 Final Launch Polls 11:20AM
HOLDING Launch Time Determination  
Variable Hold Spacecraft to internal Power  
 00:04 Hazardous Gas Monitoring Complete 11:30AM
  Automatic Sequence Begins  
  Atlas LOX Replenish Terminated  
  LOX Tank Press  
00:03 Atlas Tanks at Flight Pressure 11:31AM
00:02 Atlas and Centaur switch to internal Power 11:32AM
00:01:50 Centaur Topping Sequence complete 11:32AM
00:01:30 Launch Control System Enabled 11:32AM
00:00:16 Launch Verification 11:33AM
00:00:02.7 Main Engine Start 11:34AM
00:00:00.0 Booster Ignition 11:34AM
+00:00:01.1 Liftoff 11:34AM
 

 

 

Launch Date August 5, 2011
Launch Time 11:34am to 12:43pm EDT
Launch Site Cape Canaveral Air Force Station
  Space Launch Complex 41
Launch Window > 60 Minutes
Launch Opportunities Aug 5 - Aug 26

Links

Juno Ascent Data

Atlas V 551 Facts

Atlas V Countdown Overview

Juno Launch Windows

Weather
Updated: 08/05/11 09:10am EDT

Weather: Isolated Showers
Temperature: 86°F
Clouds: SCT10 SCT250
Winds  
Direction: 150°
Speed: 12G16 KT
Visibility: 7 mi
Lightning Probability: 20%
Precipitiation Probability: 20%
Prob. of weather rule violations 30%
Concern Cumulus Clouds
24-Hour Delay 30%
48-Hour Delay 40%
72-Hour Delay 40%

Weather Links

Florida Satellite (Visible): Click Here

Florida Satellite (IR): Click Here

Florida Satellite (False): Click Here

Launch Weather Forecast: Click Here

Florida Radar: Click Here