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

A SpaceX Falcon 9 rocket stands ready for liftoff at Cape Canaveral Air Force Station’s Space Launch Complex 40 in Florida on Dec. 4, 2019, for the company’s 19th Commercial Resupply Services mission to the International Space Station.
A SpaceX Falcon 9 rocket stands ready for liftoff at Cape Canaveral Air Force Station’s Space Launch Complex 40 in Florida on Dec. 4, 2019, for the company’s 19th Commercial Resupply Services mission to the International Space Station. Launch is scheduled for 12:51 p.m. EST. 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.

Weather officials continue to predict a 90% chance of favorable weather conditions for launch. Beginning at 12:30 p.m., join us here on the blog for live coverage, 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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