Saturday, January 22

The Countdown to SpaceX’s 22nd Resupply Services Mission Begins – SpaceX

A SpaceX Falcon 9 rocket and Dragon spacecraft stand ready for launch at Launch Complex 39A.
At NASA Kennedy Space Center’s Launch Complex 39A, a SpaceX Falcon 9 rocket and Dragon spacecraft prepare for liftoff on SpaceX’s 22nd commercial resupply services mission to the International Space Station. The time for the launch is set at 1:29 p.m. EDT. NASA is the source of this image.

From NASA’s Kennedy Space Center in Florida, hello and good afternoon! At Kennedy Space Center’s Launch Complex 39A, a SpaceX Falcon 9 rocket and Dragon spacecraft await launch. The launch is set for 1:29 p.m. EDT today, which is just under 30 minutes away, and live coverage has begun. Now you can see it on NASA TV or on the agency’s website.

This mission will transport more than 7,300 pounds of science experiments and research, crew supplies, and hardware to the International Space Station, marking SpaceX’s second flight under NASA’s second Commercial Resupply Services Contract and the company’s 22nd overall cargo resupply mission.

Here are some of today’s ascent and countdown milestones. The following times are estimates:

COUNTDOWN 
Hr/Min/Sec        Event
– 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
– 00:07:00             Falcon 9 begins pre-launch engine chill
– 00:05:00             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
Hr/Min/Sec        Event
00:01:12                 Max Q (moment of peak mechanical stress on the rocket)
00:02:26               1st stage main engine cutoff (MECO)
00:02:30               1st and 2nd stages separate
00:02:37               2nd stage engine starts
00:02:43        1st stage boostback burn begins
00:05:52               1st stage entry burn begins
00:07:41               1st stage landing
00:08:39               2nd stage engine cutoff (SECO)
00:11:52                Dragon separates from 2nd stage