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Launch Day Arrives for SpaceX’s 19th Resupply Services Mission to Station

4 Dec 2019, 14:18 UTC
Launch Day Arrives for SpaceX’s 19th Resupply Services Mission to Station

SpaceX’s Falcon 9 rocket stands ready for liftoff at Cape Canaveral Air Force Station’s Space Launch Complex 40 in Florida for the company’s 18th Commercial Resupply Services (CRS-18) mission to the International Space Station. Photo credit: NASA
SpaceX’s 19th Commercial Resupply Services (CRS-19) mission is set to launch at 12:51 p.m. EST today from Cape Canaveral Air Force Station in Florida. The company’s uncrewed Dragon spacecraft – launching aboard a Falcon 9 rocket – will deliver research, supplies and equipment to the International Space Station.
Beginning at 12:30 p.m., join NASA’s launch blog for updates and follow along on NASA TV or the agency’s website for the live launch broadcast.
Here’s a look at today’s countdown and ascent milestones. All times are approximate:
COUNTDOWN
Hour/Min/Sec – Events
-00:38:00 – SpaceX Launch Director verifies go for propellant load
-00:35:00 – RP-1 (rocket-grade kerosene) loading begins
-00:35:00 – 1st stage LOX (liquid oxygen) loading begins
-00:16:00 – 2nd stage LOX loading begins
-00:07:58 – Dragon transitions to internal power
-00:01:00 – Command flight computer to begin final prelaunch checks
-00:01:00 – Propellant tanks pressurize for flight
-00:00:45 – SpaceX Launch Director verifies go for launch
-00:00:03 – Engine controller commands engine ignition sequence to start
-00:00:00 – Falcon 9 liftoff
LAUNCH, LANDING AND DRAGON DEPLOYMENT
Hour/Min/Sec – Event
00:01:18 – Max Q (moment of peak mechanical stress on the rocket)
00:02:31 – 1st stage main engine cutoff (MECO)
00:02:34 – 1st and 2nd stages separate
00:02:42 – 2nd stage engine starts
00:02:47 – 1st stage boostback burn begins
00:06:11 – 1st stage entry burn begins
00:07:48 – 1st stage landing
00:08:35 – 2nd stage engine cutoff (SECO)
00:09:35 – Dragon separates from 2nd stage
00:12:02 – Dragon’s solar arrays deploy
02:19:00 – Dragon’s Guidance, Navigation and Control bay door opens

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