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From the inception of the Shuttle program, environmental optical quality
goals were set by a NASA panel.
The particles surrounding Shuttle observed on-orbit are believed to arise primarily from ground-based processing.
Several significant events occurred during the 6-day mission. A
12,000 l b RCA TV satellite was launched a t 0/9:32 MET (the f i r s t day of the mission a t 9 hr 32 min). There were five water dumps, and a variety of attitudes were used including passive thermal control and several different inertial attitudes for comet Halley and astronomical missions.
Although particles were observed very often during the f i r s t day on-orbit, there appears to be a marked decrease in their occurrence with time on-orbit. By the end of the 6 day mission less than 25% of the terminator crossings have any detectable particles in any frame.
Again there appears to be a decrease in particles with t i m e on-orbit.
Particles were often observed with rapidly o s c i l l a t i n g radiance levels as
if they were presenting d i f f e r e n t geometric aspects to the camera. We believe they were non-spherical p a r t i c l e s rotating. One particle exhibited 47 periodic o s c i l l a t i o n s during a 2.5 s exposure. We are unable t o postulate a source mechanism which would give rise to such rapidly rotating particles. Drag would tend to damp these rotations,
The Earth is in the field-of-view so that the s u n l i t Earth overexposes the film. The best viewing conditions are when the Shuttle bottom is illuminated and the Earth is s t i l l dark as occurred from 2/05:10 to 05-:18. Here again a flurry of particles is observed just after orbital sunrise.
This indicates that the particles were nearly always beyond 2 m from the cameras. It also appears that particles are often very asymmetric offering different geometrical areas to the cameras at an angular rate of up to 20 per second. Particles with t r a j e c t o r i e s from every direction were observed.
The PACS data in conjunction with other orbital data bases have been used to create the framework model of the Shuttle environment. Excluding orbiter activities (dumps, thruster f i r i n g s ) the clearing t i m e for the environment appears to have characteristic clearing times (e-fold) of 5 hr in a solar inertial attitude , and of 11 days for a variable attitude mission.
Originally posted by poet1b
reply to post by JimOberg
I think you are right about the observation of the tether thickness. It seems that there is quite a bit of distortion with the camera, and the viewing window with the dark Earth while in sunlight clearly has a large effect. Still, this is a long ways from explaining everything.
On the water dump situation, I find it hard to believe that these water dumps are not conducted on a planned schedule to prevent observation problems. If there is one thing NASA does, that is develop detailed procedures, which means that water dumps are planned, and not carried out in the middle of observation events. YOU know this.
It makes sense that water crystals ejecting parts would change direction, but there are several problems with this explanation. First, water crystals look like water crystals, most notably, they twinkle. Second, at least some of these ejections would be visible. We would see the plume, looking somewhat like a thruster firing. Lastly, where are all these ice crystals be coming from. From the NASA study, they should not be there.
Originally posted by poet1b
I still do not see any flash.
Originally posted by poet1b
Also, the dimmer object changes direction before the bright object in the middle of the screen. In addition, the dimmer object not only changes direction just before the brighter object, its direction is different, it moves at multiple speeds , and it changes direction and speeds several times. When you watch the original video, it can be seen changing directions and speeds almost constantly, while it is visible.
Originally posted by poet1b
Boy, the shuttle seems to make a whole lot of attitude corrections, although this was not mentioned in the NASA study on objects seen in videos. In fact, it has been noted that the shuttle does not need to make that many course corrections, and so these types of interferences could be easily avoided.
Originally posted by poet1b
This article essentially destroys the claim that these are small particles less then a meter away from the camera.
This indicates that the particles were nearly always beyond 2 m from the cameras.
Either the debunkers have not bothered to read this NASA article, or they just don't care about the truth.
In order to detect small p articles , ASA2000 negative film was used and the cameras were focused at 25 m rather than infinity. This distance represents a compromise between enhanced near field sensitivity to particles and loss of the far field stars which allowed for orientiation and in-flight calibration . (For the 25 m focal distance, stars were observed as small, well-defined circles).
Summary of PACS Data and Particle Model
The PACS camera successfully gathered data on the orbital particulate contamination environment during mission STS-61C. The film data clearly indicate that the solar illumination angle is the key parameter. We suspect particles were often present but we were able to observe them only under proper illumination conditions. At terminator crossings (when illumination conditions were reasonably good) particles were observed about one-third of the time within the 17' x 24' field-of-view of the PACS cameras. Particles were observed: when all activity was suppressed, after maneuvering, after payload bay door operations, during the preparations for a satellite launch, during and after water dumps, and after sunrise. During active events such as dumps and the satellite launch, the particle trajectories observed extrapolated back to the vicinity of the source. Atmospheric drag accelerations only slightly perturb the trajectories of detected particles during these events. Only a few particles were detected by the strobe-illumination. This indicates that the particles were nearly always beyond 2 m from the cameras. It also appears that particles are often very asymmetric offering different geometrical areas to the cameras at an angular rate of up to 20 per second. Particles with trajectories from every direction were observed.
Originally posted by zorgon
Must be 'lens artifacts'
Originally posted by depthoffield
No, it is pareidolia!
the disks were closely examined by Dr. Tsum Um Nui of Beijing around 1958... Dr. Tsum's report supposedly appeared in a professional journal in 1962
Originally posted by ArMaP
Do you know where we could read the original description instead of an "artist interpretation"? It would be better. Thanks.
Originally posted by zorgon
First I said 'Intermission' So stop being so serious all the time, your going to explode. Surely by now you understand you can't convince me of the 'lens artifact' angle?
Originally posted by zorgon
But how is this Fate magazine 'pareidolia' ? Considering that was the first time anyone saw them and reported their shape? Now does THAT make any sense to you? No one heard of the STS 75 "UFO's back in 1947
And the Dropa Stones were not even heard about till 1962...
............
So please explain the logic of you saying pareidolia to an artists sketch based on the only and first live witness report of this shape?
Originally posted by depthoffield
And, surely, i understant you don't want to accept the lens artifact solution.
Originally posted by heineken
my question about this incidence is why are all the "UFO's" facing all the same direction in 3d space..why not even one is slightly rotated than th eothers?
Originally posted by heineken
my question about this incidence is why are all the "UFO's" facing all the same direction in 3d space..why not even one is slightly rotated than th eothers?
Originally posted by Exuberant1
Originally posted by heineken
my question about this incidence is why are all the "UFO's" facing all the same direction in 3d space..why not even one is slightly rotated than th eothers?
Good point.
Perhaps they are orienting themselves in relation to the tether....
Or perhaps they are oriented in such a way that they most efficiently gather additional energy by passing through the magnetic fields - just like how the tether effect gathers energy.
Another interesting thing about these critters is how they can seem to appear out of nowhere - this is much more apparent in this version of the footage:
[edit on 30-6-2009 by Exuberant1]
Originally posted by heineken
but these 2 factors : why the hassle about the tether..and that they all face the same direction make me skeptic again
Originally posted by Exuberant1
Originally posted by heineken
but these 2 factors : why the hassle about the tether..and that they all face the same direction make me skeptic again
Why would the fact that they have similiar orientations make you a "skeptic again"?
The slits are in constantly shifting and in different positions on the critters and they pulsate at different rates - Perhaps this is simply the best way to position themselves, or it could have something to do with the tether.
I do not believe these are alien craft.
These things exhibit behaviours and properties more commonly associated with those organisms of our own biological sphere. They appear to be attracted to the tether, perhaps for the same reasons they are attracted to the thunderstorms over which they have been repeatedly filmed.