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Solving fails

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Solving fails was created by chrisvdberge

I'm having trouble with the offline solver.
Here is what I did and know so far;

- Installed the indexes 4203 and up from indilib.org/about/ekos/alignment-module.html
- used sudo dpkg -i astrometry-data-*.deb to install them
- adjusted astrometry.cfg to point to the right folder containing the indexes
- put in the correct settings in Image Info to make sure the resolution is correct
- the FOV in 'Solution Coordinates' states the correct value
- I'm using the default Options.
- I know the coordinates are within 3 degrees of the actual position. (radius is set to 30)
- I keep getting the 'Solve failed' message after the solver runs succesfully through the index fits
- I can solve the image successfully through nova.astrometry.net

Any things I could check? Some more settings somewhere?


edit: one more thing I now notice is that often the solver will go to field objects 91-100 and then stop and simply state the solve failed. But now I'm running it again and it is going to 121-130 (and still running)
Could it be due to this that it is failing? Is it simply not running long enough somehow? (limited by processor time?)
Last edit: 7 years 11 months ago by chrisvdberge.
7 years 11 months ago #7898

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Replied by Jasem Mutlaq on topic Solving fails

What is the solve-field full command? link to image? IIRC, astrometry.cfg already points to /usr/share/astrometry, what did you change?
7 years 11 months ago #7899

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Replied by chrisvdberge on topic Solving fails

I just kept the defaults for the command:
no-verify --no-plots --no-fits2fits --resort --downsample 2 -O -L 19.3223 -H 26.6952 -u aw

The astrometry.cfg was pointing to /usr/share/data, so I changed it to /usr/share/astrometry since the files are put there ;)
Last edit: 7 years 11 months ago by chrisvdberge.
7 years 11 months ago #7900

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Replied by Jasem Mutlaq on topic Solving fails

Odd I just checked the Ubuntu package and it points to /usr/share/astrometry. Anyway, post a link to the image.
7 years 11 months ago #7901

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Replied by chrisvdberge on topic Solving fails


I just tried to Load & Slew to test if the problem is with the indexes or the solver. I loaded a processed JPG and this got solved correctly.
Will run another test when it's clear to see if something is going wrong with the capturing of the frame, even though the FITS viewer shows a decent picture. (see attachment for screenshot of the FITS viewer)
Unfortunately I can't find the actual shots, think they are stored in tmp?
Last edit: 7 years 11 months ago by chrisvdberge.
7 years 11 months ago #7909
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Replied by Radek Kaczorek on topic Solving fails

This image gets blind solved within seconds with index-4210.fits

#solve-field -O ScreenShot2016-04-20at22.42.22.png
Reading input file 1 of 1: "ScreenShot2016-04-20at22.42.22.png"...
Read file stdin: 1174 x 807 pixels x 1 color(s); maxval 255
Using 8-bit output
Extracting sources...
simplexy: found 3295 sources.
Solving...
Reading file "./ScreenShot2016-04-20at22.42.22.axy"...
Field 1 did not solve (index index-4219.fits, field objects 1-10).
Field 1 did not solve (index index-4218.fits, field objects 1-10).
Field 1 did not solve (index index-4217.fits, field objects 1-10).
Field 1 did not solve (index index-4216.fits, field objects 1-10).
Field 1 did not solve (index index-4215.fits, field objects 1-10).
Field 1 did not solve (index index-4214.fits, field objects 1-10).
Field 1 did not solve (index index-4213.fits, field objects 1-10).
Field 1 did not solve (index index-4212.fits, field objects 1-10).
Field 1 did not solve (index index-4211.fits, field objects 1-10).
log-odds ratio 183.809 (6.7156e+79), 30 match, 0 conflict, 95 distractors, 34 index.
RA,Dec = (253.604,88.877), pixel scale 6.74284 arcsec/pix.
Hit/miss: Hit/miss:
Field 1: solved with index index-4210.fits.
Field 1 solved: writing to file ./ScreenShot2016-04-20at22.42.22.solved to indicate this.
Field: ScreenShot2016-04-20at22.42.22.png
Field center: (RA,Dec) = (253.593996, 88.876764) deg.
Field center: (RA H:M:S, Dec D:M:S) = (16:54:22.559, +88:52:36.351).
Field size: 2.19231 x 1.51141 degrees
Field rotation angle: up is -88.1728 degrees E of N
Creating new FITS file "./ScreenShot2016-04-20at22.42.22.new"...
Creating index object overlay plot...
Creating annotation plot...

Double check you options because using them does not result in solving the field.
I think that -L & -H options are not correct - Field size: 2.19231 x 1.51141 degrees whereas you are trying to force 19.3223 x 26.6952 arc minutes. Did you set your scope focal length correctly? What about your CCD size?

Quick fix would be to blind solve the field by removing all options but -O
Last edit: 7 years 11 months ago by Radek Kaczorek.
7 years 11 months ago #7956

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Replied by chrisvdberge on topic Solving fails


Thx!
However, I thought the L and H values were for the current scope position?
7 years 11 months ago #7957

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Replied by Radek Kaczorek on topic Solving fails

No, they are not ;-)
-L / --scale-low <scale>: lower bound of image scale estimate
-H / --scale-high <scale>: upper bound of image scale estimate

What you are referring to are:
-3 / --ra <degrees or hh:mm:ss>: only search in indexes within 'radius' of the
field center given by 'ra' and 'dec'
-4 / --dec <degrees or [+-]dd:mm:ss>: only search in indexes within 'radius'
of the field center given by 'ra' and 'dec'

and additionally radius for searching from ra/dec

-5 / --radius <degrees>: only search in indexes within 'radius' of the field
center given by ('ra', 'dec')
7 years 11 months ago #7958

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Replied by chrisvdberge on topic Solving fails


Cool, thx! Will try to alter/remove them next time I can try it out :)
7 years 11 months ago #7959

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Replied by Vincent Groenewold on topic Solving fails

Ahaaaa Chris, see, it must have been an options thingy. :) I was thinking about the H and L values, but I thought those were automatically calculated.
7 years 11 months ago #7964

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Replied by Jasem Mutlaq on topic Solving fails


They are automatically calculated if you have set the correct:
1. Telescope Focal Length
2. CCD Pixel Size

If you're using a DSLR, you must set the CCD pixel size yourself as it is different for each camera.
7 years 11 months ago #7970

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Replied by chrisvdberge on topic Solving fails


I did set these correctly, at least the FOV that is also calculated and displayed in the window was giving a correct number.
I'll pay attention to the numbers in the command line next time to see what is going on exactly ;)

In the meantime; is there any other place to edit the CCD settings other than the Image Info tab?
7 years 11 months ago #7971

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