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#600 by rvastro on 17 Feb, 2008 19:41
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Just a quick question--I recall an Orion video on L2 and the amount of time that it too to reach ISS;
but if it came down to it and energy was not a problem, about how long would it take for the shuttle to reach ISS? -
#601 by Jim on 17 Feb, 2008 21:02
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rvastro - 17/2/2008 3:41 PM
Just a quick question--I recall an Orion video on L2 and the amount of time that it too to reach ISS;
but if it came down to it and energy was not a problem, about how long would it take for the shuttle to reach ISS?
Gemini could dock with a target on the first orbit. It had a plenty of delta V and also the target was more robust wrt thruster plumes (high thrusters were not a problem) -
#602 by kneecaps on 17 Feb, 2008 22:19
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DaveS - 17/2/2008 8:22 PM
QuoteJim - 17/2/2008 7:27 PM
OK, thanks. Any body else that could confirm or deny this?QuoteDaveS - 17/2/2008 12:51 PM
Just a quick OBSS question: How is the sensor packages on the OBSS controlled? Is it from a PGSC or does those use controls on one of the aft flightdeck panels, like the SRMS?
I believe PGSC
I've taken a look at the PDRS checklists...and I see things along these lines
'A7U LDRI MODE 4 pb – push (brighter LDRI video)
Record for 30 sec
LDRI MODE 5 pb – push (flickering LDRI video)'
It refers to a push button(s) on panel A7U (which has a lot of RMS + PHOTO/TV stuff there). However my most recent reference (several years old) to panel A7U shows no such LDRI MODE button.
This leads me to beleive that some OBSS buttons have been added to this panel.
Hope this helps.
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#603 by janmb on 18 Feb, 2008 06:20
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ZANL188 - 3/11/2007 6:44 PM
TDRS has many users besides ISS & Shuttle. Ku may not always be available if other users need the capacity.
While I'm sure this is the case, I suddenly found I have troubles imagining examples of this...
What else would have need for ku level bandwidth? Surveillance satellites? -
#604 by ntschke on 18 Feb, 2008 11:00
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ntschke - 17/2/2008 12:57 PM Probably answered somewhere but my search reults didnt return anything...so here goes. Why the long time (long IMO anyway) from the crew exiting the ISS to un-docking? I know there must be leak checks performed etc, but can't that be done in a few hours time? Or is there some other reason to lock the doors today and un-dock tomorrow? Thanks
Bump to see if anyone could enlighten me on this question. In addition, it was mentioned previously in the mission that should there be a medical emergency they would de-orbit and land immediately. If that's the case why are there 2+ days in the mission timeline between hatch closings and scheduled landing? Is it all just to accomodate the final inspections, crew down-time, and most efficient orbital positiong for a landing at KSC?
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#605 by psloss on 18 Feb, 2008 11:17
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ntschke - 18/2/2008 7:00 AM
There's always a "next PLS" contingency (meaning de-orbit at the next primary landing site opportunity; that may mean the next "CONUS site" opportunity), which might be a few orbits ahead...Bump to see if anyone could enlighten me on this question. In addition, it was mentioned previously in the mission that should there be a medical emergency they would de-orbit and land immediately. If that's the case why are there 2+ days in the mission timeline between hatch closings and scheduled landing? Is it all just to accomodate the final inspections, crew down-time, and most efficient orbital positiong for a landing at KSC?
Always a good rule of thumb to search for answers from Jorge on shuttle mission ops:
http://www.nasaspaceflight.com/forum/forums/thread-view.asp?tid=8441
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#606 by ntschke on 18 Feb, 2008 11:21
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Thank you sir, I tried the search feature but got no hits. Compared to my friends and family I'm the expert shuttle fan...compared to you guys I'm in 2nd grade.
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#607 by Danny Dot on 18 Feb, 2008 12:01
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kneecaps - 17/2/2008 1:53 PM
QuoteGLS - 17/2/2008 10:55 AM
basically you use the ET prop (SSMEs) to hit your apogee height target on MECO instead of using the OMS prop (in the OMS-1 burn) after MECO.
Also as far as I understood you are more burning OMS to 'dump' the prop and hence mass, which permits more Delta V from MPS.
I beleive it's also been stated in a previous thread that the OMS assist is preferred from a processing standpoint (tanks full) rather than just putting less prop in the tanks to begin with.
Pete
If the OMS prop was burnt post MECO there would be an underspeed at MECO and the tank might land on a populated land mass. And the fact it is generating thrust is important -- i.e. it is not simply a way to get rid of the mass.
For OMS dumps preformed during an abort, the fact it is generating thrust is not important. In these cases just getting rid of the mass is the important thing about the dump.
Danny Deger -
#608 by Jim on 18 Feb, 2008 12:41
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janmb - 18/2/2008 2:20 AM
QuoteZANL188 - 3/11/2007 6:44 PM
TDRS has many users besides ISS & Shuttle. Ku may not always be available if other users need the capacity.
While I'm sure this is the case, I suddenly found I have troubles imagining examples of this...
What else would have need for ku level bandwidth? Surveillance satellites?
HST is a user and so are many of the EOS spacecraft -
#609 by janmb on 18 Feb, 2008 15:43
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Jim - 17/2/2008 6:41 PM
HST is a user and so are many of the EOS spacecraft
What's the reason they don't simply store the data locally (which they obviously do anyway) and send it whenever in direct LOS (line of sight since most use it for the very opposite in space terms) to a ground station? Sounds like waste of resources to use satellite relays for stuff like HST... -
#610 by Jim on 18 Feb, 2008 16:54
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janmb - 18/2/2008 11:43 AM
QuoteJim - 17/2/2008 6:41 PM
HST is a user and so are many of the EOS spacecraft
What's the reason they don't simply store the data locally (which they obviously do anyway) and send it whenever in direct LOS (line of sight since most use it for the very opposite in space terms) to a ground station? Sounds like waste of resources to use satellite relays for stuff like HST...
It would limit the volume of data. There aren't ground stations for HST.
The whole reason for relay satellites is to save resources. NASA was able to shutdown the bulk of its ground stations with the use of TDRSS.
A list of NASA ground stations is here
http://forum.nasaspaceflight.com/forums/thread-view.asp?tid=11434&posts=8&start=1 -
#611 by mkirk on 18 Feb, 2008 17:32
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kneecaps - 17/2/2008 5:19 PM
QuoteDaveS - 17/2/2008 8:22 PM
QuoteJim - 17/2/2008 7:27 PM
OK, thanks. Any body else that could confirm or deny this?QuoteDaveS - 17/2/2008 12:51 PM
Just a quick OBSS question: How is the sensor packages on the OBSS controlled? Is it from a PGSC or does those use controls on one of the aft flightdeck panels, like the SRMS?
I believe PGSC
I've taken a look at the PDRS checklists...and I see things along these lines
'A7U LDRI MODE 4 pb – push (brighter LDRI video)
Record for 30 sec
LDRI MODE 5 pb – push (flickering LDRI video)'
It refers to a push button(s) on panel A7U (which has a lot of RMS + PHOTO/TV stuff there). However my most recent reference (several years old) to panel A7U shows no such LDRI MODE button.
This leads me to beleive that some OBSS buttons have been added to this panel.
Hope this helps.
Uses existing buttons, however, they have been given different functions via GPC software that allows them to support the LDRI operations (see pushbuttons in lower right of photo).
Mark Kirkman
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#612 by kneecaps on 18 Feb, 2008 19:00
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mkirk - 18/2/2008 6:32 PM
Uses existing buttons, however, they have been given different functions via GPC software that allows them to support the LDRI operations (see pushbuttons in lower right of photo).
Mark Kirkman
Perfect! Thanks for clearing that up Mark! As usual great to hear from the experts.
Makes me wonder if the orbiter may be one of the earliest examples of systems to use 'softkeys'. -
#613 by DaveS on 18 Feb, 2008 19:10
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mkirk - 18/2/2008 7:32 PM
OK, thanks! Is there any documentation for these GPC software functions?
Uses existing buttons, however, they have been given different functions via GPC software that allows them to support the LDRI operations (see pushbuttons in lower right of photo).
Mark Kirkman -
#614 by mkirk on 18 Feb, 2008 19:30
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kneecaps - 18/2/2008 2:00 PM
Quotemkirk - 18/2/2008 6:32 PM
Uses existing buttons, however, they have been given different functions via GPC software that allows them to support the LDRI operations (see pushbuttons in lower right of photo).
Mark Kirkman
Perfect! Thanks for clearing that up Mark! As usual great to hear from the experts.
Makes me wonder if the orbiter may be one of the earliest examples of systems to use 'softkeys'.
There are several cases in which a button or light serves alternate purposes. A couple that immediately come to mind are the Body Flap light which extinguishes in the post meco timeframe to indicate completion of the MPS DUMP or the use of the SRB SEP or ET SEP push buttons to set the weight on wheels desicretes after landing.
Mark Kirkman -
#615 by mkirk on 18 Feb, 2008 19:34
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DaveS - 18/2/2008 2:10 PM
Quotemkirk - 18/2/2008 7:32 PM
OK, thanks! Is there any documentation for these GPC software functions?
Uses existing buttons, however, they have been given different functions via GPC software that allows them to support the LDRI operations (see pushbuttons in lower right of photo).
Mark Kirkman
I'll have to take a look. The LDRI stuff came well after my time but I am sure it is in the PHOTO TV & PDRS Checklists and is probably discussed in the most recent version of the SCOM. I'll take a look and get back to you.
Mark Kirkman -
#616 by DaveS on 18 Feb, 2008 20:23
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mkirk - 18/2/2008 9:34 PM
Thanks!
I'll have to take a look. The LDRI stuff came well after my time but I am sure it is in the PHOTO TV & PDRS Checklists and is probably discussed in the most recent version of the SCOM. I'll take a look and get back to you.
Mark Kirkman -
#617 by Jim on 18 Feb, 2008 20:28
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Then my memory is failing me. Was there a Spartan or another RMS deployed payload that used a PGSC for commanding before release?
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#618 by DaveS on 18 Feb, 2008 20:33
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Jim - 18/2/2008 10:28 PM
I believe SPARTAN was PGSC operated. At least that the post-release piruette was PGSC commanded.
Then my memory is failing me. Was there a Spartan or another RMS deployed payload that used a PGSC for commanding before release? -
#619 by kneecaps on 18 Feb, 2008 20:56
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mkirk - 18/2/2008 8:30 PM
There are several cases in which a button or light serves alternate purposes. A couple that immediately come to mind are the Body Flap light which extinguishes in the post meco timeframe to indicate completion of the MPS DUMP or the use of the SRB SEP or ET SEP push buttons to set the weight on wheels desicretes after landing.
Mark Kirkman
Great examples! I believe the speedbrake/thottle push button also arm/disarms PCT after capture?
Pete
