Mighty Atlas is standing proud and champing at the bit on the pad , on a beautiful Florida morning, ready to carry 2 SES spacecraft on a high energy trajectory to a near GEO insertion.
Good morning from #AtlasV launch control where our live blog has started for the #SES20 #SES21 satellite deployment mission. This is your official source for updates throughout the countdown to the 5:36pmEDT (2136 UTC) launch and six-hour flight: bit.ly/av_ses
The launch countdown has begun for the #AtlasV 531 rocket to launch the #SES20 and #SES21 commercial satellites to provide telecommunications coverage to the U.S. for @SES_Satellites. Launch time is 5:36pmEDT (2136 UTC). bit.ly/av_ses
We're getting ready to launch our #SES20 and #SES21 satellites today so that our customers can continue to deliver TV and radio services across the US!🚀 The live launch blog starts at 10:00am EDT🚀 The live launch broadcast begins at 5:16pm EDT 👉 ow.ly/Z4X950L0Zcf
The Atlas V 531 will make its final flight today, lofting a pair of SES communications satellites to orbit from Cape Canaveral. The launch window opens at 5:36 PM EDT (21:36 UTC).✍️ by Lee Kanayama (@Falcon_1e): https://www.nasaspaceflight.com/2022/10/final-atlas-v-531/📸 by Stephen Marr (@spacecoast_stve)
We are counting down to launch at 5:36pmEDT (2136 UTC), and all systems are "go" here at the Atlas Spaceflight Operations Center and at Space Launch Complex-41. The #AtlasV guidance system test has started, the next major milestone in the count. Live blog: bit.ly/av_ses
In the day's first briefing, Launch Weather Officer Jessica Williams tells mission managers that the forecast for launch of #AtlasV with its @SES_Satellites payload has improved to a 90 percent chance of acceptable conditions. bit.ly/av_ses
We are entering the final five hours until the liftoff time of the #AtlasV 531 rocket. All continues to progress smoothly in our countdown and the team is not working any issues that would preclude liftoff at 5:36pmEDT (2136 UTC). Weather is 90 percent GO. bit.ly/av_ses
L-minus 4 hours. All systems are "go" here at the Atlas Spaceflight Operations Center and at the Space Launch Complex-41 pad as we count down to today's #AtlasV launch for @SES_Satellites at 5:36pmEDT (2136 UTC). The weather remains favorable. bit.ly/av_ses
As @ulalaunch marches through #AtlasV countdown procedures, our team is configuring the #SES20 and #SES21 satellites for launch. The two 702SP satellites are now receiving power through the launch tower umbilicals.
Gaseous nitrogen has begun flowing into #AtlasV and the payload fairing to properly condition rocket compartments for today's fueling and flight.
In the latest launch weather briefing, @SpaceForceDOD meteorologists forecast a 90% chance of acceptable conditions for liftoff from Cape Canaveral this afternoon. Weather is acceptable for proceeding into fueling operations. bit.ly/av_ses
The launch pad crew has completed its hands-on work to ready Space Launch Complex-41 for today's #AtlasV mission. Liftoff remains scheduled for 5:36pmEDT (2136 UTC). Monitor the countdown here: bit.ly/av_ses
The countdown just entered the first of two planned 30-minute holds scheduled in today's timeline. During this hold, Launch Conductor Ron McKee will poll the team to verify all systems are ready to proceed into #AtlasV fueling operations. bit.ly/av_ses
Team has polled ready for cryo ops. No issues in work. #SES20
The countdown has resumed and we are GO to fuel the #AtlasV rocket with 66,000 gallons of liquid oxygen and liquid hydrogen. ULA Launch Director Eric Richards has authorized cryogenic tanking operations. Liftoff remains targeted for 5:36pmEDT (2136 UTC). bit.ly/av_ses
Fueling operations have been initiated at the Space Launch Complex-41 pad. The first step in tanking procedures is loading 4,150 gallons of liquid oxygen into the Centaur upper stage for today's launch of the @SES_Satellites mission. bit.ly/av_ses
Filling of the #AtlasV first stage with 48,800 gallons of super-cold liquid oxygen is underway. The main engine will be powered by the LOX and the RP-1 kerosene loaded into the rocket after rollout to the pad on yesterday. Countdown status: bit.ly/av_ses