Godspeed #JWST now get those solar panels deployed

0:00:27:07 ESC-D stage separates from JWST Altitude 1391 KM 5 Minutes until Solar panel Deploy. Congrats #ESA and #Ariane on a successful launch #JWST is on its way to L2 and SCIENCE!

0:00:08:47 #Ariane EPC core stage separation Altitude 229 KM ESC-D engine start! #JWST #WEBB Have a bout a 16 minute burn

0:00:02:21 #JWST #WEBB #Ariane EAP solid boosters shutdown and separation Altitude 72 KM

-00:00:37 #JWST #WEBB #Ariane Ignition Sequence Start!!!!!!!

T-00:01:05 #JWST #WEBB #Ariane Transition to internal Power

-00:03:40 FUELING COMPLETE. #JWST #WEBB #Ariane is Locked and loaded for launch!

T-00:06:00 No jinx, safety ordinances armed (Self destruct charges) Helium loaded . LOX and LH2 at flight levels. #JWST #WEBB #Ariane Deep breaths.. deep breaths

-00:07:00 #JWST #WEBB #Ariane Countdown NO Hold SYNCHRONIZED SEQUENCE start OMG OMG

-00:08:00 #JWST #WEBB #Ariane Payload to internal Power

-00:9:00 #JWST #WEBB #Ariane GO for Launch!! OMG IT IS HAPPENING

Weather is Green! (but cloudy) #JWST #WEBB #Ariane

T -20 minutes. everyone is on edge now #JWST #WEBB #Ariane

T-30 minutes. Board is green, all systems check out, no anomalies reported. #JWST #WEBB #Ariane

Final call will be at T-10 minutes

Raining really good at the launch site. Not a concern, as long as there is no lighting #WEBB #JWST

T-1 HOUR for opening of 32 minute launch window. There is a planned hold point at T- 7 minutes in case something happens. Like birds, Ballons. Wayward flying reindeers
#JWST #WEBB #Ariane

Broadcast FEEDS ARE LIVE

L-01:15:00 Telemetry, Tracking, Command Systems Checkouts #JWST #WEBB #Ariane

#NASA live feeds up https://www.youtube.com/watch?v=21X5lGlDOfg
#JWST #WEBB
#Ariane Main engine is being chilled. Propellent is topping off.. that is, it is sloshing around, being vented, and refilled. This goes on until about T- 06:30

’Twas the night before launch,
And all through Kourou,
The teams are a go, and the weather is to!
The rocket rolled out to the launchpad with glee,
Join us for the world's biggest launch watch party!

#JWST #WEBB

Coverage starts at 6AM ET (11 UTC): http://nasa.gov/live #UnfoldTheUniverse

Also note, The #Ariane 5 Rocket that will launch #WEBB has its Main Vulcain 2 Main Engine that will ignite 7 seconds before the Solid Rocket boosters. The SRB will provide over 80% of the Thrust needed to get #JWST to L2