SoHO Image anomaly 13 Aug 2008, What is this image? |
SoHO Image anomaly 13 Aug 2008, What is this image? |
Aug 20 2008, 07:24 PM
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#1
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Member Group: Members Posts: 235 Joined: 2-August 05 Member No.: 451 |
Over on the BAUT forum, someone pointed out this image
http://www.bautforum.com/attachments/quest...813_0918_c3.jpg I looked through the SoHO images to be sure it wasn't a hoax, and this image did appear on the official sight with no obvious artifact like this in either the image before or after it. So it is obviously not a giant comet with a coma twice the diameter of the Sun which only appears for a few minutes... it is probably an artifact inside or right next to SoHO. Does anyone have a good guess as to what it is? |
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Aug 20 2008, 07:58 PM
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#2
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
BAUT seems dead at the moment - direct links below
Aug 13th at 0842Z http://sohowww.nascom.nasa.gov/data/realti...813_0842_c3.gif 0918Z with wierd smudge http://sohowww.nascom.nasa.gov/data/realti...813_0918_c3.gif 0942Z without http://sohowww.nascom.nasa.gov/data/realti...813_0942_c3.gif Looks like some sort of optical phenomenon - who knows - cool image none the less. |
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Aug 20 2008, 08:02 PM
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#3
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Director of Galilean Photography Group: Members Posts: 896 Joined: 15-July 04 From: Austin, TX Member No.: 93 |
Looks to me like a floating piece of lint in the optics, that is out of focus.
-------------------- Space Enthusiast Richard Hendricks
-- "The engineers, as usual, made a tremendous fuss. Again as usual, they did the job in half the time they had dismissed as being absolutely impossible." --Rescue Party, Arthur C Clarke Mother Nature is the final inspector of all quality. |
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Aug 20 2008, 09:39 PM
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#4
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Member Group: Members Posts: 235 Joined: 2-August 05 Member No.: 451 |
Looks to me like a floating piece of lint in the optics, that is out of focus. I just mentioned this same idea over on BAUT. This 'event' occured during the Perseids. I wonder if some tiny dust particle collided with the camera lens during the exposure, and the haze we see is from a tiny amount of vaporized glass' smoke trail while the shutter was open. BTW, I've done no math or other physics to guess what such a pattern would look like. |
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Aug 20 2008, 11:15 PM
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#5
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Newbie Group: Members Posts: 12 Joined: 29-September 05 Member No.: 517 |
I'm having a bit of difficulty visualizing what 'during the Perseids' could even mean, since isn't SOHO about a million miles away?
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Aug 21 2008, 03:43 AM
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#6
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Junior Member Group: Members Posts: 87 Joined: 9-November 07 Member No.: 3958 |
The feature appears pretty accurately radial to the Sun's location at the field center, which is a common property of internal reflections in complex optical systems. I'm wondering whether there could have been an excursion in the spacecraft pointing which let light from the innermost corona (let alone the photosphere) somewhere that gave in internal reflection in the camera. If bright enough, what shows up in that image could even be the inompletely scrubbed afterimage of a very bright stimulus.
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Aug 21 2008, 09:33 AM
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#7
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Member Group: Members Posts: 235 Joined: 2-August 05 Member No.: 451 |
I'm having a bit of difficulty visualizing what 'during the Perseids' could even mean, since isn't SOHO about a million miles away? The Perseids cut a fairly wide swath through the solar system. The Earth, moving at 19 miles a second, is in them for a few days (millions of miles). |
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May 29 2009, 12:42 AM
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#8
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Junior Member Group: Members Posts: 47 Joined: 27-December 07 Member No.: 3991 |
Hi,
I also have something that I would love to have explained in detail. http://www.qsl.net/vk3ukf/Soho.html You'll find a still image and a close up, several short videos from SOHO showing the anomaly. The explanation was error correcting software? This appears on several frames at different wavelengths. Would love to know more about the optics, is there one CCD for the different wavelengths? |
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May 29 2009, 07:28 AM
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#9
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
One thing is for sure - it's not a 'real' object out in space. Nothing could remain stationary like that.
Each wavelength is actually a different telescope, with different optics and a different CCD. What the explanation is, I don't know. |
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May 29 2009, 08:31 AM
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#10
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Nothing could remain stationary like that. Well... A big, black rectangular monolith could... *ducks* -------------------- |
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