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Mars -July 10, 2020

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#1 yock1960

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Posted 12 July 2020 - 05:37 PM

Slowly Mars grows....hurry up!  The real show is beginning, everything else (for us 'mortals') has just been warmup. I've had some good seeing for Mars, but being above 30 degrees helps a bunch! The biggest disappointment...annoyance with this image, is a linear artifact. It's not so bad in this image, but early processing it was way noticeable. I changed AP sizes, tried different AP patterns...I don't remember seeing anything like this before and have no clue why or what to do about it. Maybe it's just an illusion, that just looks linear. It's light, so I know it's not a canal! grin.gif

 

Steve

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#2 Sunspot

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Posted 12 July 2020 - 06:02 PM

Such a very nice image!

 

I call the artifact the "curse". We all seem to have it. I've been told it's caused by diffraction around the telescope tube. (Where is a tubeless telescope when you need it?)


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#3 KiwiRay

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Posted 12 July 2020 - 07:09 PM

Really nice Mars, Steve.  I'm struggling to see where the linear artifact is.  There are albedo features that might look linear, but nothing looks unnatural (ignoring the residual edge rind of course).


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#4 AstroDan2015

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Posted 12 July 2020 - 07:37 PM

Hi Steve,

 

That's a lot of detail, congrats!

 

I think a longer FL with its accompanying higher gain setting may eliminate most of the edge artifacts and also the linear ones as well. I know that this works for me.


Edited by AstroDan2015, 12 July 2020 - 07:38 PM.

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#5 sunnyday

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Posted 12 July 2020 - 08:22 PM

nice details , thanks .


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#6 DMach

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Posted 13 July 2020 - 02:32 AM

Nice image Steve!

 

By linear artefact, are you referring to the "rind" or "ring" artefact near the edge of the planet? If not, like Ray, I'm struggling to see it.


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#7 Foc

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Posted 13 July 2020 - 05:21 AM

A very nice Mars. Perhaps we need the earlier version to clearly see your artefact presuming it is not the rind.



#8 Lacaille

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Posted 13 July 2020 - 06:31 AM

Nice work Steve. I can see the rind, which is the result of diffraction and of course very common at the moment, but you are referring to that faint double linear structure running from about 10 o’clock down to 7 o’clock? I haven’t seen that exact artefact before but it may have resulted from a run of partial frames in the video. Maybe try running it through PIPP to get rid of any frames that have only part of the planet in view? Apart from that, my only other suggestion would be to try varying the number and layout of alignment frames in Autostakkert.

Mark

Edited by Lacaille, 13 July 2020 - 06:36 AM.

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#9 RedLionNJ

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Posted 13 July 2020 - 10:30 AM

I'm assuming you mean the lighter, diagonal line top left to middle bottom, Steve?  At least, that's what I see that shouldn't be there.

 

That's a new one to me and I can't come up with a mechanism to cause such an artifact.

 

Really nice volcanoes, though - well-processed at such a tiny size.

 

Grant


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#10 phileefan

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Posted 13 July 2020 - 10:39 AM

Steve,

 

Very nice image. waytogo.gif


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#11 yock1960

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Posted 13 July 2020 - 05:35 PM

Nice image Steve!

 

By linear artefact, are you referring to the "rind" or "ring" artefact near the edge of the planet? If not, like Ray, I'm struggling to see it.

Mark has it, from about 10 down to 7 o'clock. Much worse in earlier images, which I'll try to post in a day or so. 

 

Steve



#12 yock1960

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Posted 13 July 2020 - 05:37 PM

Nice work Steve. I can see the rind, which is the result of diffraction and of course very common at the moment, but you are referring to that faint double linear structure running from about 10 o’clock down to 7 o’clock? I haven’t seen that exact artefact before but it may have resulted from a run of partial frames in the video. Maybe try running it through PIPP to get rid of any frames that have only part of the planet in view? Apart from that, my only other suggestion would be to try varying the number and layout of alignment frames in Autostakkert.

Mark

Good eye Mark! I hadn't thought of partial frames...but usually they score high and I disable them...but I'll check anyway!

 

Steve


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#13 yock1960

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Posted 13 July 2020 - 05:40 PM

I'm assuming you mean the lighter, diagonal line top left to middle bottom, Steve?  At least, that's what I see that shouldn't be there.

 

That's a new one to me and I can't come up with a mechanism to cause such an artifact.

 

Really nice volcanoes, though - well-processed at such a tiny size.

 

Grant

Yes, that's it. 

 

Thanks, Mars is still a cypher to me processing wise...just not enough reps yet, plus it does pose some unique challenges with these perky artifacts!

 

Steve


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#14 KiwiRay

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Posted 13 July 2020 - 05:56 PM

I vote for illusion, a coincidental alignment of light and dark albedo features.  We're very good at finding patterns, even chance ones like this seems to be.  I captured the same face of Mars this morning, and if I tried a little, I could also make out this line.


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#15 Tom Glenn

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Posted 13 July 2020 - 06:02 PM

Really nice image, Steve! 


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#16 yock1960

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Posted 13 July 2020 - 06:23 PM

Really nice image, Steve! 

Thanks Tom!

 

Steve 



#17 Lacaille

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Posted 14 July 2020 - 01:40 PM

I vote for illusion, a coincidental alignment of light and dark albedo features. We're very good at finding patterns, even chance ones like this seems to be. I captured the same face of Mars this morning, and if I tried a little, I could also make out this line.


Remind me to tell you about my Canal Theory!
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#18 John Boudreau

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Posted 14 July 2020 - 08:58 PM

Yes, that's it. 

 

Thanks, Mars is still a cypher to me processing wise...just not enough reps yet, plus it does pose some unique challenges with these perky artifacts!

 

Steve

It's a grouping of real albedo features--- KiwiRay's explanation is spot on. It's visible with the standard WinJupos Mars texture, and with a more recently released (2014) reprocessed USGS map of the Viking imagery that I use for WinJupos. 

 

I also recorded these linear albedo features on images I took on July 9 and 10.


Edited by John Boudreau, 15 July 2020 - 09:45 AM.



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