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Location: UFOUpDatesList.Com > 2007 > Dec > Dec 12

Re: Skylab 3

From: James Smith <lunartravel.nul>
Date: Tue, 11 Dec 2007 17:03:50 -0500 (EST)
Archived: Wed, 12 Dec 2007 06:53:18 -0500
Subject: Re: Skylab 3

>From: Bruce Maccabee <brumac.nul>
>To: <ufoupdates.nul>
>Date: Fri, 7 Dec 2007 12:12:58 -0500
>Subject: Re: Skylab 3

>>From: James Smith <lunartravel.nul>
>>To: ufoupdates.nul
>>Date: Thu, 6 Dec 2007 12:48:17 -0500 (EST)
>>Subject: Re: Skylab 3

>>Does f-stop truly relate to the exposure time? I remember in
>>Rutledge's book (Plate 9, 800mm lens, f/8 had a 1 minute
>>exposure) that he had time exposure images with standard f-
>>stops. I am a novice about photography. Is there some other
>>setting to keep the iris open for time lapse? Does the f-stop
>>affect over-under exposure?

>The "f stop" and shutter time are independent parameters which
>can be adjusted to determine the exposure level.

Thanks for the detailed explanation.

>>For this camera, out of the about 600 frames of the 10 film
>>magazines, about 50 images were blurred (about 20 blurred images
>>occurred in the UFO sequence film magazine +the one prior),
>>about 10 out of focus (6 in the two film magazines), about 30
>>underexposed (3 in the two magazines), and 3 over exposed. So
>>blurred images seemed to occur more frequently for some reason
>>during these final two film magazines.... Blur implies one axis of

>Linear blur, yes. If all the images are elongated in a certain
>direction then this is motion blur during the shutter time.
>However, to have image extension that is "left-right" as well as
>"up down" one needs more than just one axis of motion. IN this
>case one needs two axis motion and that requires accelerations
>to change the rotation from around one axis to around another,
>perpendicular axis, and that results in "loopiness" of the
>photo. I should point out that in "loopy" motion one often gets
>bright spots which signify (if the light itself is constant)
>momentary slow-downs or stops in the angular rotation (bright
>spots imply longer exposures at various portions of the "loopy"

One other thing bothering me about the UFO photos was the Skylab
flight attitude. It had to generally fly in a solar inertial
flight mode to maximize the sunlight on the solar arrays. This
means the bottom of the Skylab (and the wardroom window from
which the UFO photos were taken) would be facing into the
direction of motion at sunset. The wardroom window is at 26
degrees from the bottom of the Skylab cylinder.

However, the special case of when the EREP (Earth Resources
Photography) filming was done has the bottom of the Skylab
facing the Earth. This period makes sense to have been able to
capture the UFO images. So, no matter what, the only likely time
to capture these UFO photos is during this kind of flight

During the Day 263, from 14:42 to 16:40, the vehicle was taking
EREP pictures. (Actual times of imaging from Table 27)
94934893 The transition from the Earth facing to the solar
inertial flight mode is 9 minutes. So starting at 16:31, the
entire spacecraft is turning 90 degrees using the cold-gas
thruster attitude control system until the bottom of the Skylab
is in the velocity direction (or close to it at dusk, really the
flight mode is to have the bottom of Skylab always facing away
from the Sun).

But the astronaut's account says it did not move more than 20
degrees based on the window markings up until it disappeared on
entering into shadow. It should have moved 90 degrees if it
occurred during the period of 16:31 to 16:40. But to still be
able to see it as they entered into shadow, they would have to
be in the Earth-facing mode. But they are not. From 16:40 to
shadow (16:45), they are in solar inertial flight mode and
facing in the direction of motion. During that phase too the
motion over a ten minute period should be 40 degrees (360 deg/92
minutes_orbit *10 minutes_sighting).

So this seems to make the time period questionable. It needs to
be an EREP period but also needs to be one in which there is no
transition to solar inertial.

Also, the manuevering/flight attitudes open up the possibility
of one axis of image smear due to the Skylab turning (either due
to solar inertial or transitioning) and the other to astronaut
camera movement.

>>If they looked through their camera to take the "structure"
>>image, then I assumed they could see the object with its
>>structure, even though it may not be visible to the naked eye.

>Possibly Garriott did notice structure at the time he took the
>fourth photo, even though the image was still quite small in the
>viewing aperture of the camera. But he may also have forgotten
>that fact when queried about the event days later. THe
>astronauts did say it was "big".

Garriott is still alive. Can someone ask him? Or maybe Oberg can
if he is out there reading this.

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