Name: 銥星4號網播 (Iridium-4 Webcast)
Uploaded: 2021-01-14T10:25:20.000Z
Duration: 1 h 29 min 29 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

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It is December 22nd just after 5:12 p.m. Pacific time.

Welcome to the Webcast of the Falcon nine Mission carrying the fourth flight of 10 radium.

You're seeing the live view of Falcon nine as we prepare for launch in just over 10 minutes.

Sunset just having occurred here on the west coast of the United States.

Launch is scheduled for one hour, 27 minutes, 34 seconds.

Universal time or 5:27:34 p.m. Pacific Standard time.

I'm John is for her Falcon nine, Principal integration engineer and I will be bringing you coverage of the Space six launch for a radium next during today's Webcast.

Now, this is our fourth of eight plan watches for radium.

It's also our fourth already in flight in 2017.

We started in January with the radium one and we're wrapping up 2017 with a radium, for we're t minus 12 minutes 48 seconds.

Counting down as you just saw from the video tour we're launching from Historic Space Launch Complex for at Vandenberg Air Force Base, where I worked for several years while I was in the Air Force Slick.

For us, it's called is Space X's West Coast launch site.

On the launch pad, you can see the two stage Falcon nine vehicle.

Now the first stage provides the initial force to get out of the majority of the Earth's atmosphere.

The first stage in the close ups is the stage that has the space sex logo on it.

For that first stage, this will be its second flight, the first having been on the Iridium to mission earlier this summer.

Now what you may have noticed in our camera views is the first date does not have landing legs for this flight.

Although griffins are installed, Space six does not plan to recover this first stage.

A landing sequence out in the Pacific Ocean will be performed, but there is no drone ship in position for recovery.

Space X will not be following the first stage during the Webcast, although you may hear call outs on the countdown that while we are following the second stage as it goes into orbit.

Also of note, you may notice the Inter stage looks slightly dark city from the last flight and it ISS.

There was no need after it was recovered to totally clean and repaint.

Now on top of the first stage is the second stage that will take the satellite from the state separation altitude of just over 70 kilometers at the edge of space and accelerated up to the orbital speed of just over 7.5 kilometres per second, or about 17,500 miles per hour, 10 times faster than a bullet.

Finally, there in the view, you can see with the iridium next logo at the very top, the 17 foot diameter payload faring inside of which are 10 Iridium satellites.

And I'd finally the large white structure next to the racket.

It is our transporter Erector as a reminder.

Unlike the East Coast here on the West Coast, the transporter Erector.

We'll move away, starting at about T minus five minutes to a position 17 77.5 degrees away from the racket just before t zero t minus 10 minutes.

We're counting down launch again, planned at 27 minutes 34 seconds after the hour.

Currently on the Falcon nine, the good news is the Space X team is working no significant issues.

We began loading feel into the first stage on time.

Feel is now essentially loaded on the first stage.

We'll top it off with just a little bit from about T minus seven minutes to t minus six minutes.

And that'll finish the first age feel we are loading liquid oxygen onto both stages.

Stage one is about 80 some percent complete.

Stage two is a little more than half full.

That liquid oxygen loading will continue up until the last minutes of the countdown.

First stage completing at about T minus three minutes.

Second stage locks loading will complete about T minus two minutes.

You should hear those Countdown's over the countdown, that is, We listen to the last minutes.

Right now, The next major activity plan is in two minutes.

That will be the opening of the pre valves between the first stage propellant tanks and the nine Merlin one D engines at the bottom of the first stage that will allow liquid oxygen to bleed through.

The turbo pumps begin showing them down to prepare them for the ignition.

That it comes just a couple seconds before t zero on top of the Falcon.

Nine shown within again the set the payload.

Faring with the Iridium next logo On it are the turn of Iridium satellites.

They have gone to internal power, and they are ready for launch today.

For the range were operating out of Vanderburgh, the head of the Western Range.

Everything looks good from the air Force.

Support is in place, ready for an on time launch.

The good news is we don't have to do anything about the weather.

The Air Force weather officer has given us a 0% probability of violating conditions up around two.

Ground level winds, as you can see, are very light.

We're hardly blowing any of the mist away from the rocket, the cold moisture condensing from the chill of liquid oxygen in the stages.

Today, Space X is launching 10 radium next satellites toe Leo at short for low earth orbit.

Now each of the 10 satellites has a mass of about 600 kilograms and it's got solar rays that are currently folded up alongside each satellite.

Once they're in space, the solar is will fully deploy.

And the radium next satellite had a wingspan of approximately nine meters in length.

In order to correctly position the satellites into the right orbital plane, that means we have to launch right on time.

That means we're gonna have to recycle and try again another day.

Finally, when the second stage gets into the final orbit later this evening will be at 625 kilometers altitude from there.

Will released the tenant Iridium satellites.

They will make the maneuvers to their final orbits.

Now, that event sequence will last 15 minutes.

We're gonna hope to bring that to you, using a camera on the second stage later on.

But for now, we've got Matt dish with some of the unique features of the Iridium system when we were envisioning a radium.

Next, a whole constellation of 66 new satellites going around the Earth to replace our network, we realized returning credible real estate.

This is this is really, really important real estate to be so close to the Earth, with the network all interconnected in space.

What if other sensors could be put on our satellites?

What if other things that really wanted to see the Earth as a complete entity could also be on the satellite with us?

We decided to put a payload about this big to monitor aircraft, and it operates completely independently of our communication system.

It doesn't use the same radio frequencies or anything but what it's doing.

Its listening for the transmissions of every aircraft in the world, all of whom are broadcast in a very specific frequency in a very specific language called adsb.

Their identity, their location there speed their position, their altitude.

And while ground towers typically pick up those receptions, we knew that we were so close to the earth, and with an interconnected satellite system, we could hear those transmissions and relay them in real time to an air traffic controller and that would allow airplanes to fly much more efficiently.

Point to point, they'd be ableto climb faster.

They'd be able to fly in places where there was no radar coverage today but fly justice safely and as efficiently as they do when they were in radar coverage.

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銥星4號網播 (Iridium-4 Webcast)

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