Saturday, October 31, 2015
Tonights ISS pass (Saturday 31 October)
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Tonight's ISS pass at 20:50 ACDST. I triggered the camera too late so missed catching the first part of the pass, but it was bright, beautiful and lasted ages. I hope to be able to wake up to catch tomorrows graze of the Moon.
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| Stack of 5 images or the ISS at at its zenith below the star Fomalhaut, 5 x 5 second exposures at ASA 400, CANON IXUS stacked in ImageJ. Click to embiggen. | Animation of the 5 zenith exposures and 3 horizon exposures, images animated in ImageJ.Click to embiggen |
Tonight's ISS pass at 20:50 ACDST. I triggered the camera too late so missed catching the first part of the pass, but it was bright, beautiful and lasted ages. I hope to be able to wake up to catch tomorrows graze of the Moon.
Labels: ISS, unaided eye
# posted by Ian Musgrave @ 10:01 pm 
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Hi Ian. I need to send you something weird to analyze. Take a look at this video.
It was taken on the following: https://www.youtube.com/watch?v=6Rw5-X8CNaU
date/time: September 23rd 18:45
location: Sanibel Causeway Florida USA.
Now I am spooked on this. This is why I need your professional help.
I don't think its a lenses flare because the person saw it up close and has a witness also who can testify.
And Mercury doesn't shine this bright surely?
We spoke years ago tackling the whole Donny Gilson fear mongering scandal.
It was taken on the following: https://www.youtube.com/watch?v=6Rw5-X8CNaU
date/time: September 23rd 18:45
location: Sanibel Causeway Florida USA.
Now I am spooked on this. This is why I need your professional help.
I don't think its a lenses flare because the person saw it up close and has a witness also who can testify.
And Mercury doesn't shine this bright surely?
We spoke years ago tackling the whole Donny Gilson fear mongering scandal.
G'Day Brent
It is not a lens flare, but it is an internal reflection off the internal elements of the camera. Cameras are not designed to be pointed straight at the Sun, unless you have special solar filers on them. If you obsessively measure the location of the phantom sun you will see the angle of the phantom to the real sun rotates slightly as the camera pans across the scene. You will also note that the cloud patterns the real sun is moving through is mirrored by the phantom sun (compare 0:07, 0:21 and 0:29, especially 0:07 where the top is cut off of the second object, despite it being in a cloud free zone, mirroring the cloud bank the real sun is moving through). There are also some other phantoms that turn up, nowhere near as bright, but mirroring the sun (eg 0:20)
The finger test, where you block the light of the sun with a finger or other object, will make these sorts of phantom images go away.
A video discussing these kinds of artefacts (fairly stable sun mirror images) and the finger test is here
https://www.youtube.com/watch?v=mzgI50fZEzs&list=PLX6iy03kvnk43adyBLwtgffLXkzDnnEtA&index=1
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It is not a lens flare, but it is an internal reflection off the internal elements of the camera. Cameras are not designed to be pointed straight at the Sun, unless you have special solar filers on them. If you obsessively measure the location of the phantom sun you will see the angle of the phantom to the real sun rotates slightly as the camera pans across the scene. You will also note that the cloud patterns the real sun is moving through is mirrored by the phantom sun (compare 0:07, 0:21 and 0:29, especially 0:07 where the top is cut off of the second object, despite it being in a cloud free zone, mirroring the cloud bank the real sun is moving through). There are also some other phantoms that turn up, nowhere near as bright, but mirroring the sun (eg 0:20)
The finger test, where you block the light of the sun with a finger or other object, will make these sorts of phantom images go away.
A video discussing these kinds of artefacts (fairly stable sun mirror images) and the finger test is here
https://www.youtube.com/watch?v=mzgI50fZEzs&list=PLX6iy03kvnk43adyBLwtgffLXkzDnnEtA&index=1
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