There are a number of factors to consider when launching a rocket
including weather, fuel temperatures, and boats that stray too close to
the launch pad.
And as of Thursday evening, the rocket was reportedly in
good health. So why the cancellations?
SpaceX was originally scheduled to launch the 11,750-pound SES-9
telecommunications satellite on Wednesday, Feb. 24 out of its launch
site at Cape Canaveral in Florida.
However, because of inclement weather, the SpaceX launch team
postponed the launch
a few hours before the scheduled lift off. SpaceX later added that the
launch was also postponed, in part, out of concerns with the rocket's
fuel.
"Out of an abundance of caution, the team opted to hold launch for
today to ensure liquid oxygen temperatures are as cold as possible in an
effort to maximize performance of the vehicle," SpaceX stated on its
webcast website.
SpaceX began using a new kind of fuel with its upgraded Falcon 9
rockets last December, which now run on deep cryo liquid oxygen (LOX).
This fuel has the benefit of being more dense than other rocket
propellants, so you can pack more of it into rocket fuel tanks — which
adds to its power — but the trade-off is that you have to chill it at -340 degrees Fahrenheit.
Thursday was the back-up date, and everything looked good until, seemingly out of nowhere, the
team held the launch with just 1 minute and 40 seconds to go.
SpaceX has not announced details for why they called off the launch.
What we know is that the team decided to hold as the LOX was being
pumped into the rocket.
“Preliminary (information) is that we were … looking at how much time
we had left in the count to finish loading the liquid oxygen, and at
that time, the launch team decided that we would need to hold the
countdown,” SpaceX commentator John Insprucker said during a live
webcast, as
reported by Fortune.
At this point, anyone who's followed SpaceX launches knows that these
delays are relatively common. But, in the end, it's far wiser — and
cheaper — to be safe than sorry.
Sunday's rocket launch is scheduled to happen at 6:46 p.m. ET
followed shortly by another exciting, and potentially historic, rocket
landing attempt.
The landing attempt will take place about 10 minutes after lift off
on SpaceX's floating ocean platform called "Of Course I Still Love You."
The platform will be floating about 400 miles off Florida's coast.
If SpaceX succeeds, it will be its first successful rocket landing on
board the ocean platform. This will be its fourth attempt, and while
the company has stated that it has
low expectations of success, these rocket landings are a novelty of 21st century spaceflight and worth getting excited about.
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