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Location: UFOUpDatesList.Com > 2007 > Dec > Dec 6

Re: Skylab 3

From: James Smith <lunartravel.nul>
Date: Wed, 5 Dec 2007 13:36:33 -0500 (GMT-05:00)
Archived: Thu, 06 Dec 2007 07:10:56 -0500
Subject: Re: Skylab 3


>From: Bruce Maccabee <brumac.nul>
>To: <ufoupdates.nul>
>Date: Tue, 4 Dec 2007 23:32:04 -0500
>Subject: Re: Skylab 3

>>From: James Smith <lunartravel.nul>
>>To: ufoupdates.nul
>>Date: Tue, 4 Dec 2007 11:03:58 -0500 (GMT-05:00)
>>Subject: Re: Skylab 3

>>>From: Brad Sparks <RB47x.nul>
>>>To: ufoupdates.nul
>>>Date: Sun, 2 Dec 2007 02:10:14 EST
>>>Subject: Re: Skylab 3

><snip>

>>>>The number of Skylab debris items was about 23. There are three
>>>>objects that re-enter in Sept 1973, so the orbital elements are
>>>>likely useless. One of these re-enters on Sept 20, 1973, the day
>>>>claimed for the odd photo. There is a possibility that this
>>>>particular object is low enough in altitude to get heated up and
>>>>glow red. Therefore, it could be self illuminated via heat
>>>>radiation.

>Yes, but it wouldn't be the "red" seen in the photos. It would
>glow more like a 'blackbody' - think of very hot coals, more
>orange than red - as the temperature during reentry gets very
>high.

I have no idea how it would look over time. Has any spacecraft
ever photographed re-entering debris? The glow should change
color through the re-entry period depending on its temperature.
Meteors have been videoed using ISS/Shuttle cameras and
generally appear for no more than 2 seconds.

>>>The earth's limb was about 1,400 miles away from Skylab's
>>>height. The only way a 60-100-mile high re-entry could be viewed
>>>from Skylab against a black space background if it was about
>>>1,400 miles away. But the earth's limb would be visible
>>>immediately below the re-entry about 2 to 4 degrees below and the
>>>burning object would be progressively falling still lower.
>>>Garriott said the red object was "well above the horizon."

>Since the object was first seen 10 minutes before the shadow
>boundary, and considering that there is no evidence of the earth
>in the photos, an object at lower altitude that was glowing due
>to reentry heating would have to be far _ahead_ of the Skylab.

>Furthermore, I can't imagine how the astronauts would have
>thought it was anything other than a reentry if they saw it
>streaking along.

I am not really not pushing the re-entry idea, its just a notion
that can probably be ruled out for various reasons (needed
timing, height, camera angle stuff).

They did say it was ahead of Skylab during the transcript. It is
bothersome of some of the contradictory data (e.g. the memory of
the day of the event, whether it led or followed.) plus other
data about the photos.

It would be helpful to know the attitude of the Skylab during
that phase. I think it was usually solar inertially oriented,
and we know the location of the window.

If it was not streaking along, but matching the orbit path
somewhat during an early phase of glowing/reentry. Also, their
experience with re-entry would be the latter phases I expect,
not earlier. I still have to think through the camera
angles/Earth visibility, it is a good point.

Another thing that bothers me that you can explain I am sure is
about the fourth photo. Are you assuming the image is clearer
image of the object with booms/extensions/etc or is it just a
red dot in which the astronaut jostled the camera? I see no
where that the astronauts say specifically that the object had
booms/antenna/ protuberences. Have they ever done so? They said
it had a rotation, but that could be due to changing brightness
which is generally the case for satellites/objects/debris.

>>Do you have a reference for this? I mean when /does "glow" start
>>and how long it takes till it hits the ground.

>When it hits the ground is not relevant since it stops glowing
>brightly long before then. Stops glowing brightly at least by
>the time it reaches 8 - 10 miles (more likely 20 miles) because
>the fall slows it and cooling increases as the atmosphere gets
>thicker.

I was interested in the timing of things and not just bright
glowing, but really what I would be interested in is the
temperature profile say 5 hours prior to hitting the ground.
Then we can work out the blackbody color.



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