LIVE: SpaceX Falcon 9 - Inmarsat 5 F4 - May 15, 2017 - UPDATES

• #40 by Chris Bergin on 15 May, 2017 12:11
• William Graham's launch overview! Headline note of "expendable" due to the rarity of it these days.
  
  https://www.nasaspaceflight.com/2017/05/expendable-falcon-9-inmarsat-5-f4-launch/
• #41 by FutureSpaceTourist on 15 May, 2017 12:22
• A closer shot with logos visible:
  
  

  Quote

  Mary Whenman‏ @marywhenman 1m1 minute ago
  
  Here's the @InmarsatGlobal #I5F4 on the historic #LC39A launch pad @NASAKennedy ahead of tonight's launch 🛰🚀

  
  https://twitter.com/marywhenman/status/864092823439761408

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• #42 by edkyle99 on 15 May, 2017 15:12
• SpaceX image.  A glimpse of the flame deflector here.
  
   - Ed Kyle

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• #43 by FutureSpaceTourist on 15 May, 2017 15:35
• Close-up of fairing and second stage for another (SpaceX) shot

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• #44 by FutureSpaceTourist on 15 May, 2017 15:41
• Launch weather forecast, now 90% GO:
  
  

  Quote

  Launch day probability of violating launch weather constraints: 10%
  Primary concern(s): Cumulus Cloud Rule
  
  Delay day probability of violating launch weather constraints: 20%
  Primary concern(s): Cumulus Cloud Rule, Liftoff Winds

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  L-0 Forecast 15 May Launch.pdf
• #45 by FutureSpaceTourist on 15 May, 2017 16:48
• Quote

  Weather is GO for launch. All systems are nominal. The 49-min #I5F4 launch window opens at 19:21 EDT. WATCH it here: inmarsat.com/i5f4/

  
  https://twitter.com/inmarsatglobal/status/864159035934875648
• #46 by ChrisGebhardt on 15 May, 2017 21:44
• Hearing no issues that would prevent start of fueling in next few minutes for an on time target of 19:21 EDT.
• #47 by ZachS09 on 15 May, 2017 21:51
• 90 minutes from launch.
• #48 by ChrisGebhardt on 15 May, 2017 22:05
• 3mins to "GO/NO GO" for RP-1 fueling poll.
• #49 by ChrisGebhardt on 15 May, 2017 22:08
• Fueling poll should be underway at this time.
• #50 by ChrisGebhardt on 15 May, 2017 22:11
• If we're on schedule, RP-1 kerosene fueling of Falcon9 should be beginning now.
• #51 by ZachS09 on 15 May, 2017 22:21
• T-1 hour.
• #52 by ChrisGebhardt on 15 May, 2017 22:21
• T-1hr and COUNTING!  So far, all appears to be on track for an on time 19:21 EDT liftoff of Falcon9 with Inmarsat5.
• #53 by Steven Pietrobon on 15 May, 2017 22:21
• T-60 minutes.

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• #54 by ChrisGebhardt on 15 May, 2017 22:26
• I see vapors at LC-39A... good indication that fueling is indeed underway. 
• #55 by ZachS09 on 15 May, 2017 22:30
• Quote

  ~60 minutes until Falcon 9 launch of Inmarsat-5 Flight 4. All systems and weather are go. Watch live → http://spacex.com/webcast

  
  https://twitter.com/SpaceX/status/864246027829694464
• #56 by ChrisGebhardt on 15 May, 2017 22:31
• I have access to the FD loop, now.   All is quiet.  Will confirm start of fueling when I fear something from a console operator.
• #57 by Steven Pietrobon on 15 May, 2017 22:31
• T-50 minutes.

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• #58 by ChrisGebhardt on 15 May, 2017 22:33
• At this point, we should be 3mins away from the start of LOX load.
• #59 by ZachS09 on 15 May, 2017 22:36
• 25 minutes until the webcast should start up.