SpaceX to launch from the historic Kennedy Space Center site LC-39A [Update 2/18]

[Update 2/18] The launch was scrubbed at T-0:13 "out of an abundance of caution"  because of an upper stage thrust vector control issue.  Per Elon Musk on Twitter "the movement trace of an upper stage engine steering hydraulic piston was slightly odd" according to Elon Musk.  He added "If this is the only issue, flight would be fine, but need to make sure that it isn't symptomatic of a more significant upstream root cause".  Better to error on the side of caution.  The next window is tomorrow, Sunday the 19th, at 9:38 AM EST.

[Update] Elon Musk said on Twitter that there is a (very small) leak in the upper stage.  They are investigating and if it checks out they will attempt to launch tomorrow.  The rocket is on the pad and ready to go otherwise.

Launch Complex 39 at the Kennedy Space Center (KSC) is steeped in history.  It is comprised of two launch complexes: LC-39A and LC-39B.  These sites, built to support the Apollo program, launched the most powerful rockets built - the Saturn V.  They were later adapted for the Space Shuttle program.  So they've witnessed many historic launches (with some really big rockets).  LC-39A was used for most of the manned Apollo launches, including the Apollo 11 mission that landed the first men on the moon, and was watched by millions on TV.

SpaceX secured a lease for LC-39A and has been adapting it for it's Falcon 9 and Falcon Heavy rockets. This site will be used by SpaceX for the first time this Saturday with the launch the CRX-10 mission to resupply the ISS.  With this mission being a LEO mission, there will be ample fuel to make a landing at the SpaceX Landing Complex 1 at Cape Canaveral .  Coming off of a string of successful landings at sea, this will attempt to be the third landing at Landing Complex 1 (with the first being the second OG2 mission landing, which was the first successful landing for SpaceX anywhere).

This will be the first launch from LC-39A since the Space Shuttle program ended.  The launch is scheduled for 10:01 AM EST (15:01 GMT) tomorrow (Saturday February 18th) - weather permitting of course, which is questionable at this time.

The Falcon 9 has been lifted onto the pad (watch this nice time-lapse video of the process) in preparation for launch.  Unlike the Saturn V that was assembled vertically in the vertical assembly facility and wheeled to the pad standing up, the Falcon 9 rocket is prepared while laying horizontally, and is then stood up at the launch pad.

The NASA page for the mission is here, and the live webcast of the launch can be found on the SpaceX Webcast page or at the SpaceX YouTube site (choose the hosted version unless you're a seasoned launch watcher).