Author Topic: LIVE: Delta IV - GPS 2F-1 - May 27, 2010  (Read 127603 times)

Offline Jim

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Re: Delta IV - GPS 2F-1 - May 21
« Reply #20 on: 05/19/2010 07:41 pm »

1.  One thing that I didn't know about (caveat: I'm a launch newbie) before I read that document was the concept of PCS, second stage Probability of Command Shutdown >= 99.7% (page 12).

For the benefit of anybody else who might wonder what that means, to save them from having to dig, the Delta people's explanation is that "0% PCS means spacecraft orbit insertion at second-stage cutoff always occurs due to a propellant depletion shutdown (PDS) and is never commanded by guidance."

So, apparently, given the various things that fluctuate from nominal on launch day (like weather), and assuming successful launch vehicle operation, you have a 99.7% chance of not running out of "gas" before you've reached your target destination.

2.  I'd be curious if anyone knows more about, on chart 5, which signals are sent to the re-radiating antennae outside the fairing, and which are just leaking through the 14" diameter RF window?  I'm assuming the re-rad antennae are for S-band telemetry of the vehicle?

1.  Which means the vehicle has reserves for 3 sigma dispersions (99.7%)

2.  The re-rad is for the spacecraft telemetry

Offline HIPAR

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Re: Delta IV - GPS 2F-1 - May 21
« Reply #21 on: 05/19/2010 10:18 pm »
Here's a picture of the GPS satellite being prepared for transport to the Cape.

---  CHAS

Offline Chris Bergin

Re: Delta IV - GPS 2F-1 - May 21
« Reply #22 on: 05/21/2010 05:55 pm »
 Cape Canaveral AFS, Fla., (May 21, 2010) - A United Launch Alliance Delta IV rocket with the Air Force’s Global Positioning System GPS IIF SV-1 (GPS IIF SV-1) satellite sits poised on its Space Launch Complex-37 launch pad ready to launch tonight.  The launch is set for 11:25 p.m. EDT with the launch window extending until 11:43 p.m. EDT. The weather forecast calls for a 90 percent chance of acceptable weather during the launch window. GPS IIF SV-1 is the first in a series of next generation GPS satellites. Following its nearly three hour, 33 minute flight, it will join a worldwide timing and navigation system utilizing 24 satellites approximately 11,000 miles above the Earth’s surface. Photo by Pat Corkery, United Launch Alliance
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Offline Chris Bergin

Moved for live coverage.
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Offline jcm

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Re: Delta IV - GPS 2F-1 - May 21
« Reply #24 on: 05/21/2010 11:13 pm »
Mission booklet:

Thanks for that link, Chris!  I found it informative.
 

I notice that this mission booklet doesn't give the parking orbit heights - usually the Delta mission books have a few more details than this.
-----------------------------

Jonathan McDowell
http://planet4589.org

Offline HIPAR

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Re: Delta IV - GPS 2F-1 - May 21
« Reply #25 on: 05/22/2010 12:22 am »
Mission booklet:

Thanks for that link, Chris!  I found it informative.
 



I notice that this mission booklet doesn't give the parking orbit heights - usually the Delta mission books have a few more details than this.


This GPS satellite is going directly to its operational orbit.

---  CHAS
« Last Edit: 05/22/2010 12:47 am by HIPAR »

Offline Chris Bergin

All ok with three hours to go, according to ULA.

William's oveview article will be on in around an hour.
« Last Edit: 05/22/2010 12:49 am by Chris Bergin »
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Offline Ronsmytheiii

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Re: LIVE: Delta IV - GPS 2F-1 - May 21 (22 east of Eastern)
« Reply #27 on: 05/22/2010 01:21 am »
« Last Edit: 05/22/2010 01:24 am by Ronsmytheiii »

Offline butters

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Re: LIVE: Delta IV - GPS 2F-1 - May 21 (22 east of Eastern)
« Reply #28 on: 05/22/2010 01:23 am »
So... I see that NASA PAO is doing some sort of Delta IV coverage here:

http://science.ksc.nasa.gov/shuttle/countdown/video/chan12large.jpg

But I can't find any video feed, and the NASA TV schedule website doesn't mention this launch.  Am I missing something?

Offline Ronsmytheiii

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Re: LIVE: Delta IV - GPS 2F-1 - May 21 (22 east of Eastern)
« Reply #29 on: 05/22/2010 01:25 am »

Offline Chris Bergin

So... I see that NASA PAO is doing some sort of Delta IV coverage here:

http://science.ksc.nasa.gov/shuttle/countdown/video/chan12large.jpg

But I can't find any video feed, and the NASA TV schedule website doesn't mention this launch.  Am I missing something?

It's not a NASA launch. Webcast will be via www.ulalaunch.com
« Last Edit: 05/22/2010 01:26 am by Chris Bergin »
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Offline DaveS

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Re: LIVE: Delta IV - GPS 2F-1 - May 21 (22 east of Eastern)
« Reply #31 on: 05/22/2010 01:26 am »
So... I see that NASA PAO is doing some sort of Delta IV coverage here:

http://science.ksc.nasa.gov/shuttle/countdown/video/chan12large.jpg

But I can't find any video feed, and the NASA TV schedule website doesn't mention this launch.  Am I missing something?
Yes, not a NASA launch. NASA neither own nor operates the GPS program. That's an engineering feed from ULA as the ULA logo in the lower right corner indicates.

The views on the web-cam page of science.ksc.nasa.gov, are engineering views, none are broadcast on NASA TV unless selected by the NASA TV operator.
« Last Edit: 05/22/2010 01:28 am by DaveS »
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Offline Ronsmytheiii

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Re: LIVE: Delta IV - GPS 2F-1 - May 21 (22 east of Eastern)
« Reply #32 on: 05/22/2010 02:13 am »
Ground path from Mission booklet:


Offline Ronsmytheiii

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Re: LIVE: Delta IV - GPS 2F-1 - May 21 (22 east of Eastern)
« Reply #34 on: 05/22/2010 02:48 am »

Offline Chris Bergin

Another excellent preview/overview by William Graham:

http://www.nasaspaceflight.com/2010/05/live-delta-iv-launch-gps-iif-sv-1/
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Offline Nick L.

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Re: LIVE: Delta IV - GPS 2F-1 - May 21 (22 east of Eastern)
« Reply #36 on: 05/22/2010 02:58 am »
"Now you may leave here for four days in space, but when you return it's the same old place..."

Offline Ronsmytheiii

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Re: LIVE: Delta IV - GPS 2F-1 - May 21 (22 east of Eastern)
« Reply #37 on: 05/22/2010 03:00 am »
webcast started
« Last Edit: 05/22/2010 03:00 am by Ronsmytheiii »

Offline Andrewwski

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Re: LIVE: Delta IV - GPS 2F-1 - May 21 (22 east of Eastern)
« Reply #38 on: 05/22/2010 03:00 am »
NEW MUSIC VIDEO:
STS-125 DREAMS in HD!

Offline Nick L.

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Re: LIVE: Delta IV - GPS 2F-1 - May 21 (22 east of Eastern)
« Reply #39 on: 05/22/2010 03:01 am »
"Now you may leave here for four days in space, but when you return it's the same old place..."

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