It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
Originally posted by Rezlooper
In the beginning of this thread it was mentioned that there hasn't been any recent photos of ISON posted since July. Has this changed and are there any more current photos of the comet?
This "stupid thread" should stay until the comet comes closer and be seen by specialists and non -specialists alike.
No they are not some technical issue of the software, that the self-determined operators try to convince us.
In the image above (which we recommend you click on to see a comparison with its "pretty" counterpart image), we see something that doesn't look a lot like a comet, and very much not like the beautiful Hubble Heritage image of ISON.
We see three distinct nuclei that appear as short streaks oriented in different directions. Why is this?
The Hubble image of Comet ISON is not a single exposure but instead a series exposures taken at different times.
Hubble is in orbit around the Earth, so is actually moving through space at a very high velocity. When compiling this image, the Hubble team aligned all of the exposures such that the stars remained fixed in space.
This greatly enhances the detail of the stars and galaxies in the field of view and makes the image far prettier to look at. Unfortunately this also means that the comet (which is very much closer to Hubble than it is to the stars) appears in a slightly different location in each of the exposures that are taken, because the Space Telescope never sits still!
Furthermore, the images taken were long exposures -- up to 490-seconds. Any photographer will tell you that a long exposure of a moving bright light will lead to a streak in the image, and that is exactly what we see with the comet. Finally, the streaks are oriented in different directions due to Hubble's elliptical orbit around Earth. Depending on where the telescope is at a given time on this ellipse, it leads to a "streak" that trails in a different direction.
Originally posted by Yummy Freelunch
I really dont mean to beat a dead horse..Ive been researching and keeping up on ISON daily..there has been much speculation and theories, but nothing to date actually proves anything about the original pictures..
This is the latest news from the comet ISON campaign headquarters..yes, it says what others have said..but I have to tell you..I still dont believe it. This is their explanation.
In this case, the largest part of the blurring is due to the motion of Hubble itself rather than the motion of the comet. Hubble is orbiting the Earth every 95 minutes. The third exposure ended 46 minutes after the start of the first exposure. During that time the telescope moved from one side of its orbit to the other, a distance of about 8000 miles (~13,000 km). Because the comet is relatively nearby (compared with the distant stars and galaxies), its apparent position among the stars changes due to the different viewing position. This effect is known as parallax. It is expected when observing Solar System targets, and can produce very obvious motion or blurring in images as Hubble whips around the Earth.
There is a nice discussion of the effects of parallax on the Comet ISON images in this YouTube video. It includes detailed modeling of the parallax in these particular images and shows that the observed pattern is exactly what is expected.
I have taken pictures all my life..streaks are streaks..and these images are NOT streaks..they are perfect objects, lighted objects..they are NOT streaks..
ive taken many streaked pictures..(im not proud of it_)..this just doesnt feel right, its not an adequate answer.
I feel that this "comet" is three parts..just like the picture shows..
Originally posted by ngchunter
I have taken pictures all my life..streaks are streaks..and these images are NOT streaks..they are perfect objects, lighted objects..they are NOT streaks..
I see, have you also been doing astrophotography all your life? And photographing comets in telescopes all your life? And analyzing the images of orbiting satellites based on their orbits all your life? Even I can't claim to have done all that all my life, but I have been doing it for a while now. Are these streaks not streaks?
If not, why not? If so, why different than the ISON streak? Naturally it doesn't show parallax, but that's because I'm on the ground, not orbiting earth.
Originally posted by Yummy Freelunch
reply to post by fiftyfifty
You should keep wondering...that little bit of doubt you feel is real. You can beat me all you want..but im not joking
Originally posted by NeoParadigm
reply to post by Yummy Freelunch
If this were true..the stars would look like lines as well, since they are roundish, also.
No because the stars are stationairy(relatively) and the comet is moving. You are not getting it at all, mam.
They make a pic with an exposure of 440seconds. Everything that happens in that period is recorded in one image. Since the comet moves it forms a line. The stars don't because they are stationairy unlike the comet.edit on 18-8-2013 by NeoParadigm because: (no reason given)
Originally posted by Yummy Freelunch
I have taken pictures all my life..streaks are streaks..and these images are NOT streaks..they are perfect objects, lighted objects..they are NOT streaks..ive taken many streaked pictures..(im not proud of it_)..this just doesnt feel right, its not an adequate answer.
I will keep up to date on this thread as much as I can, but I just wanted to tell all of you, there is something fishy about all of this!!!!
I feel that this "comet" is three parts..just like the picture shows..