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LIVE: STS-115 Flight Day 4 (EVA-1)
by
jacqmans
on 12 Sep, 2006 03:31
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#1
by
astrobrian
on 12 Sep, 2006 04:00
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Highlight day for the mission and ISS program as a whole. Truss attatchment and solar array deployment
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#2
by
nathan.moeller
on 12 Sep, 2006 04:38
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Haven't heard a response from the crew after the wake up call. What gives?
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#3
by
nathan.moeller
on 12 Sep, 2006 04:41
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Nevermind there they are. Configuring for cryocooling. What's the scheduled duration for this EVA today? Good luck Tanner and Piper!
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#4
by
MKremer
on 12 Sep, 2006 05:00
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EVA scheduled for about 6.5 hrs, can go 7 if needed.
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#5
by
Chris Bergin
on 12 Sep, 2006 05:03
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Big day, for more than one reason.
Attached are two overview screenshots of FD4 on the 207 page STS-115 Final Flight Plan on L2.
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#6
by
jacqmans
on 12 Sep, 2006 05:11
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#7
by
jacqmans
on 12 Sep, 2006 07:17
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#8
by
Stardust9906
on 12 Sep, 2006 07:35
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#9
by
jacqmans
on 12 Sep, 2006 07:39
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#10
by
Spirit
on 12 Sep, 2006 07:45
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P3/4 ready to latch.
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#11
by
jacqmans
on 12 Sep, 2006 07:45
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#12
by
Stardust9906
on 12 Sep, 2006 07:45
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#13
by
jacqmans
on 12 Sep, 2006 07:47
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#14
by
Stardust9906
on 12 Sep, 2006 07:58
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First stage of capture complete. SSRMS in limp mode.
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#15
by
Stardust9906
on 12 Sep, 2006 08:02
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Second and third stages of capture now complete.
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#16
by
jacqmans
on 12 Sep, 2006 08:39
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#17
by
psloss
on 12 Sep, 2006 08:41
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Two of four bolts now complete. One more and the EVA will pick up...the third bolt is being driven now...takes about 8-10 minutes.
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#18
by
Oli4
on 12 Sep, 2006 08:41
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@ astrobrian: the deployement of the solar arrays isn't planned for today. The arrays wil be deployed after EVA 2...
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#19
by
psloss
on 12 Sep, 2006 08:43
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Airlock depress scheduled for about 15 minutes from now.
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#20
by
Chris Bergin
on 12 Sep, 2006 08:43
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It's about to officially become a part of the ISS
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#21
by
psloss
on 12 Sep, 2006 08:50
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Standing by for bolt #2...(1 and 3 already done)
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#22
by
nitin52
on 12 Sep, 2006 08:52
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Can some one post the close up view of the computer screen shot they are showing on NASA TV.
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#23
by
psloss
on 12 Sep, 2006 08:55
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The third bolt is now officially confirmed; it looked it happened on the display while it was being showed. PAO says that the SSRMS can now ungrapple and the EVA is go to start.
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#24
by
psloss
on 12 Sep, 2006 09:01
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slipstream - 12/9/2006 4:44 AM
nitin52 - 12/9/2006 12:39 PM
Can some one post the close up view of the computer screen shot they are showing on NASA TV.
Got one however in low quality
Thanks.
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#25
by
psloss
on 12 Sep, 2006 09:03
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Ground just gave the crew a go to depress.
Also now a go to ungrapple the P3/P4.
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#26
by
nitin52
on 12 Sep, 2006 09:04
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Ok. Thanks.
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#27
by
rosbif73
on 12 Sep, 2006 09:08
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Today's execute package has been posted:
http://www.nasa.gov/pdf/157294main_fd04_ex_pkg.pdfGood morning Atlantis!
Thanks for one more day of superb work on orbit yesterday! Today is construction day and
we will be happily following along! Good luck with powering up Station!
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#28
by
psloss
on 12 Sep, 2006 09:14
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Airlock depress approaching 5 psi...
Fourth of four bolts on P3/P4 to P1 interface now being driven.
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#29
by
psloss
on 12 Sep, 2006 09:22
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Airlock depress below 2 psi and sounds like the SSRMS is in motion...
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#30
by
psloss
on 12 Sep, 2006 09:23
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Fourth bolt of the segment-to-segment attach system now tightened.
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#31
by
psloss
on 12 Sep, 2006 09:33
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Hatch opening confirmed...I think I heard Heidemarie Stefanyshyn-Piper say "sure looks dark out."
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#32
by
eeergo
on 12 Sep, 2006 09:37
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Looks like they're waiting for sunrise to get out...
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#33
by
Donna Spaceships
on 12 Sep, 2006 09:39
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I can't work out what she's saying.
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#34
by
psloss
on 12 Sep, 2006 09:42
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eeergo - 12/9/2006 5:24 AM
Looks like they're waiting for sunrise to get out...
They're doing EMU and other EVA equipment status checks -- recording suit parameters, etc. -- before they start translating over to the truss.
It's not a fast process; we're getting video now.
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#35
by
psloss
on 12 Sep, 2006 09:44
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Heidemarie Stefanyshyn-Piper now out of the airlock.
5:17 am Eastern was the official EVA start time (suits to internal power).
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#36
by
eeergo
on 12 Sep, 2006 09:46
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That's right, my fault. :O
Anyway, they're waiting for good lightning
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#37
by
jacqmans
on 12 Sep, 2006 09:48
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#38
by
psloss
on 12 Sep, 2006 09:48
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eeergo - 12/9/2006 5:33 AM
That's right, my fault. :O
Anyway, they're waiting for good lightning
No worries -- actually, they're not wasting any time -- they've already translated across the spur to S0 and are doing the tether swap...
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#39
by
eeergo
on 12 Sep, 2006 09:51
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How's this truss addition going to affect station's attitude? Obviously the CM is shifting quite a lot, so how are they going to compensate it?
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#40
by
jacqmans
on 12 Sep, 2006 09:53
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#41
by
psloss
on 12 Sep, 2006 09:54
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They've reached the new piece of the station...it's nice to know when sunrise is, because they'll probably want to put down the sun visors on the helmets -- the lighting change is pretty fast.
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#42
by
eeergo
on 12 Sep, 2006 09:57
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Look at them... so cute crawling on the truss
Edit: Yeah, helmetcam!
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#43
by
psloss
on 12 Sep, 2006 09:58
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eeergo - 12/9/2006 5:38 AM
How's this truss addition going to affect station's attitude? Obviously the CM is shifting quite a lot, so how are they going to compensate it?
There was a note in one of the ISS status reports just before the launch campaign started (late August)...have to go look for that, but it might be a good question to throw over to the ISS forum.
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#44
by
Chris Bergin
on 12 Sep, 2006 09:59
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Anyone who is on L2 are welcome to copy some useful pages out of the STS-115: Full EVA overview and images (326 pages, 56 meg) document into here.
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#45
by
psloss
on 12 Sep, 2006 10:01
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There's a timeline in today's execute package, too...Joe Tanner got a go for beginning the P3 lower tray work...
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#46
by
MKremer
on 12 Sep, 2006 10:01
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eeergo - 12/9/2006 4:38 AM
How's this truss addition going to affect station's attitude? Obviously the CM is shifting quite a lot, so how are they going to compensate it?
CMGs shouldn't have a problem for normal attitude control. Orbit boosts will have to compensate for the mass change until S3/S4.
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#47
by
psloss
on 12 Sep, 2006 10:05
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FWIW, the 24 August status report waves "good-bye" to the XPOP attitude. That's on L2.
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#48
by
jacqmans
on 12 Sep, 2006 10:11
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#49
by
psloss
on 12 Sep, 2006 10:14
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Finally got the cameras repointed...Stefanyshyn-Piper out on P4 (left) and Tanner on the right working on the P3/P1 lower tray hookups.
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#50
by
psloss
on 12 Sep, 2006 10:25
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Lower tray utility connections complete 51 minutes into EVA.
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#51
by
psloss
on 12 Sep, 2006 10:31
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There's the CID-7 call from the summary timeline. Next step for Tanner is releasing the aft (4A) beta gimbal assembly (BGA) restraints. Stefanyshyn-Piper is working on the aft solar array blanket box (SABB) restraints.
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#52
by
psloss
on 12 Sep, 2006 10:32
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Crew just now called that focused TPS inspections not needed...
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#53
by
Chris Bergin
on 12 Sep, 2006 10:33
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No FI required. They surely must believe the Gap Filler (the main one) will fall out during re-entry.
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#54
by
psloss
on 12 Sep, 2006 10:35
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Stefanyshyn-Piper has finished releasing the aft solar array blanket box (SABB) restraints, now moving to do the same for the forward (2A) SABB.
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#55
by
chksix
on 12 Sep, 2006 10:36
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They should have the EV-1 and 2 stripes on the top of the gloves too to make it easier to see who's helmet cam we are looking through.
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#56
by
psloss
on 12 Sep, 2006 10:39
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#57
by
jacqmans
on 12 Sep, 2006 10:41
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#58
by
psloss
on 12 Sep, 2006 10:50
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Looks like the four-bar linkage is swinging out on the aft wing...
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#59
by
jacqmans
on 12 Sep, 2006 10:51
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#60
by
psloss
on 12 Sep, 2006 10:53
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Tanner has all four linkages on the aft wing latched now.
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#61
by
eeergo
on 12 Sep, 2006 10:57
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The night has fallen... and by the way, the helmetcams seem to have some problem, all we get are stills...
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#62
by
eeergo
on 12 Sep, 2006 10:59
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45 minutes ahead of schedule! wow, that's fast
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#63
by
eeergo
on 12 Sep, 2006 10:59
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45 minutes ahead of schedule! wow, that's fast
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#64
by
triddirt
on 12 Sep, 2006 11:00
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Just reported ~45minutes ahead of timeline
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#65
by
chksix
on 12 Sep, 2006 11:00
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I heard 25 mins but the sound quality here isn't very good.
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#66
by
psloss
on 12 Sep, 2006 11:01
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eeergo - 12/9/2006 6:44 AM
The night has fallen... and by the way, the helmetcams seem to have some problem, all we get are stills...
That could just be orbiter Ku blockage. It's only a problem for us that we're only getting sequence stills from the orbiter...the IV has been referring to the helmet cams in the air-to-ground...
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#67
by
eeergo
on 12 Sep, 2006 11:07
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#68
by
jacqmans
on 12 Sep, 2006 11:09
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#69
by
eeergo
on 12 Sep, 2006 11:15
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Oh no! She's holding a galactic plasma gun!
Beautiful screwdriver!
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#70
by
psloss
on 12 Sep, 2006 11:22
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Stefanyshyn-Piper getting ready to swing the forward wing out...
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#71
by
eeergo
on 12 Sep, 2006 11:24
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#72
by
psloss
on 12 Sep, 2006 11:25
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Looks like we're getting some orbiter TV approaching sunrise...
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#73
by
eeergo
on 12 Sep, 2006 11:28
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SARJ preparation underway... first task: to release a shroud and cover fasteners.
And look at that... P4 is stretching its arms!
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#74
by
psloss
on 12 Sep, 2006 11:29
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Stefanyshyn-Piper working on manually deploying four-bar linkage...it's moving...
Edit: this one (the forward one) sounds like it's a little harder to deploy...
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#75
by
chksix
on 12 Sep, 2006 11:31
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Will they test SARJ motion before unfolding the panels?
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#76
by
psloss
on 12 Sep, 2006 11:33
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chksix - 12/9/2006 7:18 AM
Will they test SARJ motion before unfolding the panels?
Yes.
Sounds like Tanner is being asked to help with the forward four-bar linkage deploy.
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#77
by
psloss
on 12 Sep, 2006 11:34
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Swung all the way out now, checking the latches...
Edit: ...sounds like it's locked down...
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#78
by
Stardust9906
on 12 Sep, 2006 11:38
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#79
by
eeergo
on 12 Sep, 2006 11:40
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Great view... and all solar arraw masts are deployed!
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#80
by
psloss
on 12 Sep, 2006 11:41
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Stefanyshyn-Piper now at the end of the mast canister swinging the blanket boxes out on the forward wing...looks like it's done.
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#81
by
psloss
on 12 Sep, 2006 11:45
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The ground is ready to start the P3-P1 upper tray work; discussing whether to finish current steps in work on the SARJ.
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#82
by
psloss
on 12 Sep, 2006 11:46
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Tanner is working on the SARJ drive locking assembly (DLA)...
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#83
by
JimO
on 12 Sep, 2006 11:48
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Anybody have any further thoughts on that 20-sec blinking object? They had promised not to jettison anything during this EVA but that looks like an obvious explanation -- if we can identify what object, cover, blanket, whatever got loose.
By the way, I think your site clock is fast by a few minutes. I note posts coming up with time tags about 3 minutes ahead of my WWV watch display time.
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#84
by
eeergo
on 12 Sep, 2006 11:54
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JimO - 12/9/2006 1:35 PM
Anybody have any further thoughts on that 20-sec blinking object? They had promised not to jettison anything during this EVA but that looks like an obvious explanation -- if we can identify what object, cover, blanket, whatever got loose.
Maybe a nearby satellite reflecting at that moment the light in the correct direction?
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#85
by
nacnud
on 12 Sep, 2006 11:55
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From the images you posted it looked like lens flare, I take it you think otherwise.
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#86
by
eeergo
on 12 Sep, 2006 11:56
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#87
by
Chris Bergin
on 12 Sep, 2006 12:04
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Really does give you an idea of scale, doesn't it.
How's their timeline? Missed the last note on that (Rob Navis I assume, seen as this is great coverage).
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#88
by
eeergo
on 12 Sep, 2006 12:04
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Tanner is working with the drive lock assemblies while Piper is rigidizing the AJIS struts...
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#89
by
Chris Bergin
on 12 Sep, 2006 12:06
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JimO - 12/9/2006 12:35 PM
By the way, I think your site clock is fast by a few minutes. I note posts coming up with time tags about 3 minutes ahead of my WWV watch display time.
It is Jim - we'll sort it (job for the webwizards).
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#90
by
psloss
on 12 Sep, 2006 12:07
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Chris Bergin - 12/9/2006 7:51 AM
(Rob Navis I assume, seen as this is great coverage).
That's your buddy Kyle Herring.
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#91
by
psloss
on 12 Sep, 2006 12:10
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Chris Bergin - 12/9/2006 7:53 AM
It is Jim - we'll sort it (job for the webwizards).
Might want to consider increasing the time-sync frequency for your servers...or is that a manual thing?
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#92
by
JimO
on 12 Sep, 2006 12:10
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"From the images you posted it looked like lens flare, I take it you think otherwise."
Now that I've looked at the images again, I suspect a lens effect too. Does its brightness vary with that of other apparitions along that optical line where the other flares also align?
Maybe it'll show up on the 'space UFO' websites shortly.
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#93
by
eeergo
on 12 Sep, 2006 12:11
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Well, I'm leaving for a while, my girlfriend is getting angry
Great spacewalk, hope I'm back in a few hours!
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#94
by
chksix
on 12 Sep, 2006 12:12
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Is that schedule on the left screen available on L2? I havn't been able to locate it...
Edit:
My error I think since that is the ISS controlroom.
Not even sure if it's a schedule
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#95
by
chksix
on 12 Sep, 2006 12:24
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Did the PAO say that they are 90 mins ahead of schedule?! They must have expected big problems when planning for this EVA. That's a good thing that they don't have any of those problems.
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#96
by
MKremer
on 12 Sep, 2006 12:24
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That left front screen IIRC, is a combination of cautions and warnings, items in work, and work scheduled.
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#97
by
Tony T. Harris
on 12 Sep, 2006 12:29
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JimO - 12/9/2006 6:57 AM
"From the images you posted it looked like lens flare, I take it you think otherwise."
Now that I've looked at the images again, I suspect a lens effect too. Does its brightness vary with that of other apparitions along that optical line where the other flares also align?
Maybe it'll show up on the 'space UFO' websites shortly.
It'll of been an optical illousion on the lens, via flare, which are the mainstay of UFO sites
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#98
by
chksix
on 12 Sep, 2006 12:34
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MKremer - 12/9/2006 2:11 PM
That left front screen IIRC, is a combination of cautions and warnings, items in work, and work scheduled.
Thanks!
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#99
by
JimO
on 12 Sep, 2006 12:37
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Re mystery flare -- I really doubt it's a 'nearby satellite', they would have much greater angular rates in the FOV. If it's real, it's something off the ISS. Let me check with other sources -- including radar tracking. What was the clock time of that scene again?
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#100
by
JimO
on 12 Sep, 2006 12:42
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re message 67202, slipstream's initial post, about 4:55 AM EDT...
The light flares when the solar reflection flares, and it subsides when the solar reflection in the right of the FOV also subsides.
The 20-23 second period could merely reflect (pun intended) a slow flexing motion of the reflecting surface, or a slow cycle of the camera's AGC -- auto gain control.
It will take a lot to convince me that this is not a camera artifact.
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#101
by
triddirt
on 12 Sep, 2006 12:48
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Good comment just now from Heidemarie about how realistic the Pool training is except "No Divers and No bubbles"...
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#102
by
Chris Bergin
on 12 Sep, 2006 13:04
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Welcome to tool time on the ISS
Seems like the rather cool drill is being a bit of a pain..
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#103
by
gocamels
on 12 Sep, 2006 13:10
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Craftsman...NOT the Official Tools of NASA...The Official Tools of NASCAR
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#104
by
jacqmans
on 12 Sep, 2006 13:12
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#105
by
Felix
on 12 Sep, 2006 13:25
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Anyone knows the get-ahead tasks for this EVA?
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#106
by
jacqmans
on 12 Sep, 2006 13:26
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#107
by
jacqmans
on 12 Sep, 2006 13:34
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#108
by
jacqmans
on 12 Sep, 2006 13:36
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Time to relax and enjoy the view :-)
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#109
by
lcs
on 12 Sep, 2006 13:38
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What do they mean by 'analog downlink' ? The picture looks highly digital to me.
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#110
by
jacqmans
on 12 Sep, 2006 13:46
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Installing the thermal cover...
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#111
by
jacqmans
on 12 Sep, 2006 13:50
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4 hrs and 16 min into the EVA...
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#112
by
David BAE
on 12 Sep, 2006 13:57
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They'd legally have to go for a 15 minute tea break in the UK now
Great storyboard on the mission here.
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#113
by
Chris Bergin
on 12 Sep, 2006 13:59
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#114
by
Terry Rocket
on 12 Sep, 2006 14:07
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Are they going to interupt this with a press conference at 3pm, 10am East?
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#115
by
triddirt
on 12 Sep, 2006 14:09
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Felix - 12/9/2006 9:12 AM
Anyone knows the get-ahead tasks for this EVA?
Seems like they're handling this in real time...
Added just now (Pulled from EVA2)
Cover and Launch Locks (1 apiece Page FS 7-45)
DEPLOY SARJ BRACES (Page FS 7-50)
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#116
by
eeergo
on 12 Sep, 2006 14:23
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4 and a half hours EVA elapsed time... and yet 2 hours to go!
They've got a good mess with the cover numbers
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#117
by
triddirt
on 12 Sep, 2006 14:29
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Joe dropped a bolt and washer (for the MLI) it's gone now... Suprised this doesn't happen more often... Do they have spares?
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#118
by
eeergo
on 12 Sep, 2006 14:38
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One cover removed by Piper, and one launch lock by Tanner... and the poor little bolt/washer is lost in space!
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#119
by
nathan.moeller
on 12 Sep, 2006 14:42
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It sounded to me like they lost a bolt in the structure.
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#120
by
Mark Nguyen
on 12 Sep, 2006 14:44
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Consequences?
Mark
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#121
by
eeergo
on 12 Sep, 2006 14:48
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nathan.moeller - 12/9/2006 4:29 PM
It sounded to me like they lost a bolt in the structure.
It was from one launch lock, so there shouldn't be more consequences than other bit of orbital debris out there...
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#122
by
nathan.moeller
on 12 Sep, 2006 14:53
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eeergo - 12/9/2006 9:35 AM
nathan.moeller - 12/9/2006 4:29 PM
It sounded to me like they lost a bolt in the structure.
It was from one launch lock, so there shouldn't be more consequences than other bit of orbital debris out there...
That would be my guess as long as no one comes back and says it could affect the truss in any way. SFN comfirms it was a lost bolt, spring and washer from the launch lock.
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#123
by
kneecaps
on 12 Sep, 2006 14:53
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An object of that size should be trackable by ground radar. Presumably they will monitor it to ensure it won't recontact the stack at some point later. I have a faint memory of something being lost on a spacewalk before and it being tracked.
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#124
by
nathan.moeller
on 12 Sep, 2006 15:00
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kneecaps - 12/9/2006 9:40 AM
An object of that size should be trackable by ground radar. Presumably they will monitor it to ensure it won't recontact the stack at some point later. I have a faint memory of something being lost on a spacewalk before and it being tracked.
Yeah it was Piers Sellers favorite spatula during tile repair technique testing on the final spacewalk for STS-121
I imagine it'll just stay down in the truss structure.
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#125
by
eeergo
on 12 Sep, 2006 15:09
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#126
by
MKremer
on 12 Sep, 2006 15:11
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nathan.moeller - 12/9/2006 9:47 AM
kneecaps - 12/9/2006 9:40 AM
An object of that size should be trackable by ground radar. Presumably they will monitor it to ensure it won't recontact the stack at some point later. I have a faint memory of something being lost on a spacewalk before and it being tracked.
Yeah it was Piers Sellers favorite spatula during tile repair technique testing on the final spacewalk for STS-121 I imagine it'll just stay down in the truss structure.
Joe said he was pretty sure it skittered over the cover and went overboard. He looked over and around quite a bit there and in the direction it went and couldn't see it.
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#127
by
nathan.moeller
on 12 Sep, 2006 15:15
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Images of the array base with our spacewalking friends kind of puts it in perspective how big this truss structure is. Quite stunning! It's going to be absolutely beautiful once they get those wings deployed. Are there 16 launch locks that have to be removed from the SARJ?
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#128
by
nathan.moeller
on 12 Sep, 2006 15:19
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MKremer - 12/9/2006 9:58 AM
nathan.moeller - 12/9/2006 9:47 AM
kneecaps - 12/9/2006 9:40 AM
An object of that size should be trackable by ground radar. Presumably they will monitor it to ensure it won't recontact the stack at some point later. I have a faint memory of something being lost on a spacewalk before and it being tracked.
Yeah it was Piers Sellers favorite spatula during tile repair technique testing on the final spacewalk for STS-121 I imagine it'll just stay down in the truss structure.
Joe said he was pretty sure it skittered over the cover and went overboard. He looked over and around quite a bit there and in the direction it went and couldn't see it.
Guess it's a pretty good thing that these things get moving and stay moving in one direction away from the station then huh? Funny thinking that it'll find it's way back to Earth eventually in the form of a charred piece of metal.
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#129
by
eeergo
on 12 Sep, 2006 15:20
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Well, they're already verifying they have everything inside the retrieval bag... so the spacewalk is about to end
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#130
by
MKremer
on 12 Sep, 2006 15:20
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Hopefully they won't lose anymore lock thermal cover bolts tomorrow.
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#131
by
eeergo
on 12 Sep, 2006 15:24
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"This could be the world's ugliest bag... it doesn't need to be pretty"
Tanner
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#132
by
nathan.moeller
on 12 Sep, 2006 15:29
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Correct me if I'm wrong but it seems the SARJ won't be able to allow the arrays to move 360 degrees until 12A.1 retracts the port array on P/6 or the P/4 arrays will come in contact with it. Am I seeing that wrong or did I miss some information completely?
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#133
by
Joffan
on 12 Sep, 2006 15:33
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You're right nathan, they need to retract that P6 wing to allow full rotation of the SARJ - I guess they could test it a little though.
I'm wondering whether the lost bolt (if still inboard) could interfere with the working of the SARJ....
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#134
by
DaveS
on 12 Sep, 2006 15:36
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nathan.moeller - 12/9/2006 5:16 PM
Correct me if I'm wrong but it seems the SARJ won't be able to allow the arrays to move 360 degrees until 12A.1 retracts the port array on P/6 or the P/4 arrays will come in contact with it. Am I seeing that wrong or did I miss some information completely?
Correct. Also until 12A.1 P4 will only have survival power as it won't generate any energy.
This one of the major objectives of 12A.1, to recofigure the station from it's early interim cooling and power generation, to the permanent configuration which uses power from P4 and cooling from S1/P1 trusses.
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#135
by
triddirt
on 12 Sep, 2006 15:37
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Apparently a 6 hour EVA means you don't have to cook. Brent getting dinner for Joe and Heide
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#136
by
DaveS
on 12 Sep, 2006 15:39
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Joe and Heide is now back at Quest.
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#137
by
dutch courage
on 12 Sep, 2006 15:49
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Solar panels don't have to be exactly facing the sun to still be able to generating power. On Earth they generate power even when it's cloudy.
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#138
by
Chris Bergin
on 12 Sep, 2006 15:56
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triddirt - 12/9/2006 4:24 PM
Apparently a 6 hour EVA means you don't have to cook. Brent getting dinner for Joe and Heide
Heh. Good work today.....some of the calls going up were really complex, as the mission is supposed to be.
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#139
by
nathan.moeller
on 12 Sep, 2006 15:58
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DaveS - 12/9/2006 10:23 AM
nathan.moeller - 12/9/2006 5:16 PM
Correct me if I'm wrong but it seems the SARJ won't be able to allow the arrays to move 360 degrees until 12A.1 retracts the port array on P/6 or the P/4 arrays will come in contact with it. Am I seeing that wrong or did I miss some information completely?
Correct. Also until 12A.1 P4 will only have survival power as it won't generate any energy.
This one of the major objectives of 12A.1, to recofigure the station from it's early interim cooling and power generation, to the permanent configuration which uses power from P4 and cooling from S1/P1 trusses.
Yeah that's what I was beginning to think would happen. I guess they've got it configured to move around a little bit to make sure it works and add some power. I guess that's why 12A.1 is designated a "power reconfig" huh? Haha. Yeah I knew they didn't have to face the sun directly to provide power. And in any case, P/6 is enough to power the station on its own for a good while longer. So these arrays won't make much difference until they start getting more modules hanging off the front of the station. Thanks for the answers!
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#140
by
MKremer
on 12 Sep, 2006 15:58
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dutch courage - 12/9/2006 10:36 AM
Solar panels don't have to be exactly facing the sun to still be able to generating power. On Earth they generate power even when it's cloudy.
P4 won't be electrically connected to the station power grid until the 12A.1 mission, however.
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#141
by
HKS
on 12 Sep, 2006 16:01
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MKremer - 12/9/2006 5:45 PM
dutch courage - 12/9/2006 10:36 AM
Solar panels don't have to be exactly facing the sun to still be able to generating power. On Earth they generate power even when it's cloudy.
P4 won't be electrically connected to the station power grid until the 12A.1 mission, however.
I think they are going to rotate that SARJ to check it before deploying the solar blankets...
And untill 12A.1 it will just maintain power for itself (as MKremer said)
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#142
by
DaveS
on 12 Sep, 2006 16:02
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EVA End: 6 hours and 26 minutes.
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#143
by
eeergo
on 12 Sep, 2006 16:02
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And EVA-1 has officialy finished! Good work, Tanner and Piper, awesome job!
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#144
by
psloss
on 12 Sep, 2006 16:04
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DaveS - 12/9/2006 11:23 AM
Correct. Also until 12A.1 P4 will only have survival power as it won't generate any energy.
What I thought I heard was that the 2A and 4A wings on P4 would only power P3/P4 until the power distribution was reconfigured on the next flight...but that's plenty of margin for just that set of electronics...
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#145
by
nathan.moeller
on 12 Sep, 2006 16:20
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Beautiful view of the solar array mast on NASA TV.
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#146
by
MKremer
on 12 Sep, 2006 16:24
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HKS - 12/9/2006 10:48 AM
I think they are going to rotate that SARJ to check it before deploying the solar blankets...
Yes, after tomorrow's EVA (and assuming there's no problem to prevent it), they'll test the SARJ joint. P4 has to be rotated back to its neutral position before they unfold the arrays, and that needs to be done first because P6 is in the way.
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#147
by
JimO
on 12 Sep, 2006 16:47
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"Guess it's a pretty good thing that these things get moving and stay moving in one direction away from the station then huh? "
But they don't, necessarily -- that's the scary part. I wrote up an explanation over at msnbc.com about the only 'safe' way to throw something overboard from a spacecraft. The link might still be good:
http://www.msnbc.msn.com/id/11102068/
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#148
by
yinzer
on 12 Sep, 2006 16:57
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If something like a nut or a washer drifts away (as opposed to being heaved), isn't its ballistic coefficient going to be low enough that it will appear to continually move away from the station, forward and down?
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#149
by
Chris Bergin
on 12 Sep, 2006 17:16
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JimO - 12/9/2006 5:34 PM
"Guess it's a pretty good thing that these things get moving and stay moving in one direction away from the station then huh? "
But they don't, necessarily -- that's the scary part. I wrote up an explanation over at msnbc.com about the only 'safe' way to throw something overboard from a spacecraft. The link might still be good: http://www.msnbc.msn.com/id/11102068/
Link is good - great read.
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#150
by
stroker
on 12 Sep, 2006 17:37
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Chris Bergin - 12/9/2006 12:03 PM
JimO - 12/9/2006 5:34 PM
"Guess it's a pretty good thing that these things get moving and stay moving in one direction away from the station then huh? "
But they don't, necessarily -- that's the scary part. I wrote up an explanation over at msnbc.com about the only 'safe' way to throw something overboard from a spacecraft. The link might still be good: http://www.msnbc.msn.com/id/11102068/
Link is good - great read.
Seconded. That's an awesome article. It's just like Heinlein said--if you want to slow down, speed up, and if you want to speed up, slow down.
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#151
by
Joffan
on 12 Sep, 2006 17:46
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yinzer - 12/9/2006 10:44 AM
If something like a nut or a washer drifts away (as opposed to being heaved), isn't its ballistic coefficient going to be low enough that it will appear to continually move away from the station, forward and down?
The "drift" description implies that the separation velocity of the orbits was low, so effectively the orbital parameters are the same, and will recross twice each orbit. Look for the nut or washer to reappear! The saving grace might be the drag, especially for a washer, which would indeed tend to take it down (and hence forward).
...and welcome to the board, stroker.
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#152
by
Flightstar
on 12 Sep, 2006 17:47
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There's a media conference at the top of the hour, in case no one has mentioned. Good to see you around here Jim, how's Jay Barbee these days?
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#153
by
MKremer
on 12 Sep, 2006 18:00
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yinzer - 12/9/2006 11:44 AM
If something like a nut or a washer drifts away (as opposed to being heaved), isn't its ballistic coefficient going to be low enough that it will appear to continually move away from the station, forward and down?
Not especially - it would be about the same as, say, undocking one of the Soyuz or Progress ships and immediately allowing it to free-drift. Its 'new' orbit would bring it back around near the station again.
The only hope with small parts and pieces that drift off is that their lighter mass allows quicker atmospheric friction decay, or that they can be tracked fairly quickly so just one small thruster "burp" is all that's needed to avoid it from then on.
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#154
by
dutch courage
on 12 Sep, 2006 18:25
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If I'm not mistaken the screw/spring/washer shouldn't be able to come lose from the thermal protection.
So Tanner is not to blame for that added space junk.
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#155
by
jacqmans
on 12 Sep, 2006 18:52
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#156
by
nathan.moeller
on 12 Sep, 2006 19:45
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Wow that's an amazing article. I'm afraid I can't wrap my head around all that. Unbelievable how orbital mechanics work. Very cool! Great day for spacewalking. Truss looks beautiful sitting out there. Can't wait for the array deployment!
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#157
by
mtakala24
on 12 Sep, 2006 20:18
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was this the post-MMT-briefing already?
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#158
by
dutch courage
on 12 Sep, 2006 20:23
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POST-MMT BRIEFING rescheduled to 3:45 pm CDT / 4:45 EDT
Again with John Shannon and Kirk Shireman.
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#159
by
nathan.moeller
on 12 Sep, 2006 21:02
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Briefing starting.
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#160
by
yinzer
on 12 Sep, 2006 21:09
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MKremer - 12/9/2006 10:47 AM
yinzer - 12/9/2006 11:44 AM
If something like a nut or a washer drifts away (as opposed to being heaved), isn't its ballistic coefficient going to be low enough that it will appear to continually move away from the station, forward and down?
Not especially - it would be about the same as, say, undocking one of the Soyuz or Progress ships and immediately allowing it to free-drift. Its 'new' orbit would bring it back around near the station again.
The only hope with small parts and pieces that drift off is that their lighter mass allows quicker atmospheric friction decay, or that they can be tracked fairly quickly so just one small thruster "burp" is all that's needed to avoid it from then on.
I'm unconvinced.
There's the behavior coming from the initial separation impulse, which is determined by the Clohessy-Wiltshire equations and gives the receding-climbing-closing-diving loops described in the Oberg article. If the separation impulse is directly up or down, the thing will come back half an orbit later and hit the space station with exactly the same velocity with which it left.
There's also the behavior due to differential atmospheric drag; this will make the more draggy object move continually forward and down relative to the less draggy object. Assuming an aluminum nut 2 cm in diameter and 1 cm tall, and using the ISS data from
here, it looks like the nut will be about 10 times more draggy than the ISS.
Given that ISS loses between 50 and 200 m of altitude per day, the nut (the densest of the 3 things) should lose altitude at nearly a kilometer per day. I'd think this would totally dominate the relative motion, and after even a couple of hours the thing should be out of the vicinity of the ISS never to return.
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#161
by
nathan.moeller
on 12 Sep, 2006 21:20
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Atlantis is officially cleared for re-entry. All inspections by the ground teams were completed in half the estimated time of 5 days. Shannon says that Discovery will be in great shape for a night launch in December and that they feel very good about launching at night again due to the lighting from the boosters and the available inspection techniques.
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#162
by
MKremer
on 12 Sep, 2006 21:58
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yinzer said -
I'm unconvinced.
There's the behavior coming from the initial separation impulse, which is determined by the Clohessy-Wiltshire equations and gives the receding-climbing-closing-diving loops described in the Oberg article. If the separation impulse is directly up or down, the thing will come back half an orbit later and hit the space station with exactly the same velocity with which it left.
There's also the behavior due to differential atmospheric drag; this will make the more draggy object move continually forward and down relative to the less draggy object. Assuming an aluminum nut 2 cm in diameter and 1 cm tall, and using the ISS data from here, it looks like the nut will be about 10 times more draggy than the ISS.
I 'm not quibbling with your figures (or your reasoning), but how about a SS bolt 3cm long by 0.5cm (with a 1cm flange), departing zenith (or within 10° forward) @ 20cm/sec?
Being somewhat ignorant about mass -vs- cross section -vs- atmospheric drag, would a more-massive object be susceptable to the same or less atmospheric drag forces than a less-massive object of the same size/shape?
Not to say I'm very worried about it - I would think even if it were even possible to get near the station within 1 or 2 orbits, the most it could do would be to bounce off, which would cause it to lose energy and enter a lower, faster orbit and decay to re-entry. (assuming it didn't bounce off a sensitive/easily damaged area)
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#163
by
yinzer
on 12 Sep, 2006 22:55
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That bolt has a ballistic coefficient about 50% higher than the aluminum nut, but it will still decelerate much faster than the ISS. 20 cm/sec will boost it into an orbit with a mean altitude 300 m higher, and receding 100 km per orbit. Assuming that the altitude loss due to drag figure of 500 m / day is reasonable, this orbit will have decayed to completely within the ISS orbit long before it the ISS catches back up to it.
If Jorge sees this, he can verify or correct my math.
As for collision, well, 20 cm/sec is about what you'd get if you dropped something from a foot up on Earth. Vast areas of the ISS will be completely immune to this, but there might be areas that could be damaged. Chips out of windows or lodging in a moving part would be my main concerns, albeit not big ones.
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#164
by
MKremer
on 12 Sep, 2006 23:41
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OK, thx, sort of what I assumed, if all the details are correct for that kind of piece escaping during an EVA.
It stands to reason the longer the ISS is there and unfinished, the more 'stuff' has a chance of going off on its own during EVAs (of which they may or may not have figured to happen over the years), and the more potential danger the ISS is in during its planned construction.
After Core Complete it's pretty much a wash, assuming a somewhat higher orbit, and less obvious opportunities for debris generation.
