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#20
by
Jim
on 14 May, 2013 19:02
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There is an Atlas at the pad
Did you get to work on this payload Jim?
USAF mission, only work NASA
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#21
by
Chris Bergin
on 14 May, 2013 23:56
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The ULA Atlas V vehicle was rolled to the launch pad this morning in preparation for tomorrow’s Air Force Global Positioning System (GPS) IIF-4 launch. The mission is set to liftoff on Wednesday, May 15 from Space Launch Complex 41 at Cape Canaveral Air Force Station in Florida. The 18-minute launch window opens at 5:38 p.m. EDT. Today’s L-1 forecast continues to show an 80 percent chance of favorable weather conditions for launch.
Cape Canaveral Air Force Station, Fla. (May 14, 2013) - A United Launch Alliance Atlas V rolls out for launch at Space Launch Complex-41 with the Air Force’s Global Positioning System (GPS) IIF-4 spacecraft. Launch is set for Wednesday, May 15 at 5:38 p.m. at the opening of the 18-minute window. GPS IIF-4 is the fourth in a series of next generation GPS satellites and will join a worldwide timing and navigation system utilizing 24 satellites in six different planes, with a minimum of four satellites per plane positioned in orbit approximately 11,000 miles above the earths’ surface.
Photo by Pat Corkery, United Launch Alliance
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#22
by
Galactic Penguin SST
on 15 May, 2013 03:32
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Does anybody know why the Centaur is completely unpainted for this launch? Never seen this before!
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#23
by
russianhalo117
on 15 May, 2013 03:47
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Does anybody know why the Centaur is completely unpainted for this launch? Never seen this before!
It is typically done for long duration missions where thermal management of Centaur Cryo is a requirement. NASA typically now just uses white Centaur.
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#24
by
Chris Bergin
on 15 May, 2013 11:15
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Moved for live coverage.
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#25
by
Chris Bergin
on 15 May, 2013 12:11
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#26
by
grythumn
on 15 May, 2013 14:35
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Good article.
GPS IIF-4 has Space Vehicle Number (SVN) 66. It will use PRN-27; a signal modulation previously used by USA-84, or GPS IIA-6 (SVN-27), a twenty-year-old satellite which was retired from service last October.
PRN-27 has also been broadcast (albeit not marked healthy or included in the almanacs) by SVN-49 in the meantime. Was that thought just to be confusing the issue?
-Bob
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#27
by
Galactic Penguin SST
on 15 May, 2013 14:56
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Good article.
GPS IIF-4 has Space Vehicle Number (SVN) 66. It will use PRN-27; a signal modulation previously used by USA-84, or GPS IIA-6 (SVN-27), a twenty-year-old satellite which was retired from service last October.
PRN-27 has also been broadcast (albeit not marked healthy or included in the almanacs) by SVN-49 in the meantime. Was that thought just to be confusing the issue?
-Bob
Apparently moved to PRN30 last week:
http://www.gps-forums.net/notice-advisory-navstar-users-nanu-2013029-nanu-type-general-t44712.html
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#28
by
Jim
on 15 May, 2013 14:58
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Launch site
Spacecraft
Launch Vehicle
patches
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#29
by
Ben the Space Brit
on 15 May, 2013 15:41
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@ JIm,
The spacecraft crew are clearly comic nerds of a considerable scale. I approve.
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#30
by
jacqmans
on 15 May, 2013 18:41
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InsideKSC@InsideKSC
The Atlas V with #GPSIIF4 at CCAFS SLC-41, moments ago. Launch NET 5:38 p.m. EDT. pic.twitter.com/uDJjXUUkZ2
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#31
by
jacqmans
on 15 May, 2013 18:43
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ULA@ulalaunch
90% chance of favorable weather for today's #GPSIIF4 #satellite launch on an #AtlasV. Launch window opens at 5:38 p.m. EDT.
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#32
by
jacqmans
on 15 May, 2013 18:52
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ULA@ulalaunch
The #GPSIIF4 count is now in a planned 30-min hold at T-2 hours. This is the first of two planned holds in the count #AtlasV
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#33
by
Prober
on 15 May, 2013 19:13
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ULA's web video had sound up and a slide just a while ago.
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#34
by
jacqmans
on 15 May, 2013 19:20
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ULA@ulalaunch
The poll for cryogenic fueling is complete, and the team has the go to begin fueling operations. Count has resumed at T-2 hours. #GPSIIF4
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#35
by
Chris Bergin
on 15 May, 2013 19:26
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ULA:
Everything is progressing for the launch at 5:38 p.m. The launch team gave a go to fuel the vehicle and that operation will begin shortly. The forecast now shows a 90 percent chance of favorable weather for launch.
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#36
by
beidou
on 15 May, 2013 19:41
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T-2h
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#37
by
LouScheffer
on 15 May, 2013 19:51
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Anyone know the plan to dispose of the Centaur after releasing the satellite? The planned burns total 14:16 . Combining the fuel mass, the ISP, and the thrust would indicate the Centaur could run for 15:30 if it used every last drop and none evaporated on the way up. So there might be quite a bit of delta-V left over if the Centaur works normally.
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#38
by
Rocket Science
on 15 May, 2013 20:20
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O2 tanking...
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#39
by
Overflow
on 15 May, 2013 20:22
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Launch team has received the "go" to begin filling the Centaur upper stage with the supercold fuel.
