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Location: UFOUpDatesList.Com > 2007 > Dec > Dec 14

Re: Skylab 3

From: Brad Sparks <RB47x.nul>
Date: Thu, 13 Dec 2007 23:47:25 EST
Archived: Fri, 14 Dec 2007 07:40:45 -0500
Subject: Re: Skylab 3

>From: Bruce Maccabee <brumac.nul>
>To: <ufoupdates.nul>
>Date: Thu, 13 Dec 2007 15:01:30 -0500
>Subject: Re: Skylab 3

>>From: James Smith <lunartravel.nul>
>>To: ufoupdates.nul
>>Date: Wed, 12 Dec 2007 15:57:33 -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


>>>>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. This could not explain why the object got dark upon
>>>>entering shadow unless there is fortuitous timing of the
>>>>object's disintegration. Another possibility is that it is
>>>>heating up and giving off gases/particles that catch the sun-
>>>>light, increasing its effective size. Then fade out would match
>>>>going in shadow.

>>>Do you see any earth background in the Skylab red object photos?
>>>Any trace of the earth's limb anywhere?? A re-entry occurs at
>>>about 60-100 miles, far far below the Skylab at 273 miles

>>Another thing I thought of was that apogee (high point in the
>>orbit) and perigee (low point) would not be equal for an object
>>just prior to re-entry.

Satellites and space objects nearing reentry circularize their
orbits so perigees and apogees would be almost the same.

>>Based on your updated SL3 web page, I want to re-emphasize the
>>conflict of dates of the laser experiment photos. The mission
>>report for Skylab 3...


>The report provided a little more information on the "red
>satellite" sighting in section 10.5 labelled "Visual
>Observations and Unusual Events." It says that the object
>changed to a more reddish hue during the last 20 seconds of

From about 275 miles up in the Skylab-3 the earth's horizon is
about 1400 miles away and the effectively 20 mile thickness of
atmosphere (approximately) is about 0.8 degree thick. The sun's
diameter is 0.5 degree thus the sun's light reddened through the
atmosphere will cover an angle of about 1.3 degrees. At its
orbital velocity of 4.75 miles per second the Skylab would cover
1.3 degs of earth-central angle (90 miles) in 19 seconds.

Brad Sparks

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