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Old 12-11-2014, 09:20 PM
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codemonkey (Lee)
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Astrotortilla help

Hey guys,

Having some problems with Astrotortilla. I had it working fine with my ED80, but since trying to use it with my RC8 it's unable to solve anything. I'm using it in conjunction with an Atik 314L

I think I've downloaded all of the index files (33.7Gb of them at any rate), so I don't believe that's the issue.

I've tried:

* Search radius up to 90
* Upping the scale max, and reducing the scale min, I can't remember exact numbers but they were significantly changed
* Exposures from 5s to 30s
* Binning from 1x to 4x
* Nebulosity for capture, and screen capture through Artemis
* Sigma down as low as 20
* Star shape relaxation setting (-c) up to 0.05
* JNOW and J2000

I'm totally at a loss on what I can try next. Does anyone have any suggestions?

Attached is a screen shot of my initial settings, ignoring the capture settings of 30s.
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  #2  
Old 13-11-2014, 12:03 AM
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Amaranthus (Barry)
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Getting the correct image scale is the key. Then everything falls into place. What is your focal length, pixel size and sensor dimensions?
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Old 13-11-2014, 06:23 AM
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codemonkey (Lee)
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I used this to calculate the scale info: http://www.skyatnightmagazine.com/field-view-calculator Gives me a FOV of 19.01' x 14.2' which could be my problem. I've realised now, thanks to you, that I stupidly had my numbers swapped. I was using the scale values for my ED80 on my RC8. Move along now, nothing to see here....
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Old 13-11-2014, 07:59 AM
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Merlin66 (Ken)
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CCDCalc is also very useful....
http://www.newastro.com/book_new/camera_app.html
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Old 13-11-2014, 08:50 AM
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Amaranthus (Barry)
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Let's hope that resolves it Lee! I find that once I get my image scale in arcsexpic correct (such that it is solving consistently), then I can tighten those up after some trial-and-error and really cut the solve time (to typically 6-10sec).
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Old 14-11-2014, 10:10 AM
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codemonkey (Lee)
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Quote:
Originally Posted by Merlin66 View Post
CCDCalc is also very useful....
http://www.newastro.com/book_new/camera_app.html
Thanks Ken :-)

Quote:
Originally Posted by Amaranthus View Post
Let's hope that resolves it Lee! I find that once I get my image scale in arcsexpic correct (such that it is solving consistently), then I can tighten those up after some trial-and-error and really cut the solve time (to typically 6-10sec).
That was it, thanks Barry! Solved first attempt last night in about 11s, then the second iteration in 6. It's good to be back
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