NGC6905 image not solving

Stacking program, astrometric (plate) solver, fits file viewer

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NGC6905 image not solving

Forum: General discussions ASTAP

Creator: Robert Howester

Created: 2022-09-12

Updated: 2022-09-13

Robert Howester - 2022-09-12

Hi Han,
I use ASTAP often. Great software. But recently it’s become challenging.
The attached png image of NGC6905 takes over 30 minutes for ASTAP to say, “no plate solution found.” (The same image when submitted to Astrometry.net is solved in 5 seconds.)
I’m running Windows 10 64-bit, ASTAP v2022.08.18, database H18. ASTAP was downloaded and installed as is, with no changes.

What ASTAP settings do I need to get this NGC6905 image to solve?

(Image and current settings are attached.)

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han.k - 2022-09-12

Hi Robert,

Attachment is missing. Can you try again?

Han

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Robert Howester - 2022-09-12

Hi Han, Here it is again. Got Forge gateway error last time.

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Robert Howester - 2022-09-12

Still getting Forge gateway error. So I'll try one file at a time.

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Robert Howester - 2022-09-12

Still getting Forge gateway error. So I'll send it via email to you.

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han.k - 2022-09-12

The 8bit PNG is not solving . I think ASTAP has problem to separate bright and faint stars. The image goes probably deep. Stretched for details? FOV about 0.3 degrees?

A raw stack would probably work better. Do you have the original (stacked) FITS file for testing?

I will remove the PNG from the forum to save some space.

Han

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Robert Howester - 2022-09-12

Hi Han,
Yes, the PNG file was stretched. Here is the link to the 66 MB original (stacked) FITS file.
https://drive.google.com/file/d/1QolRJl86PMp1E-wGckzEvtfdTnHtn_DU/view?usp=sharing
Robert

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han.k - 2022-09-13

Yes that works better. Solved, see settings in attached screenshot. Stretching & 8 bit conversion makes separation of bright and faint stars much more difficult and solving could fail. ASTAP is more sensitive to stretching then Astrometry.net.

Regards, Han

Untitled.png

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Robert Howester - 2022-09-13

Thank you Han. I tried the suggested settings and the solve on my system was .4 seconds!
Should I keep your suggested settings for the image as my default settings for all images?

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han.k - 2022-09-13

Yes these values are good. Only the "search radius" you could change from 20 to 180 degrees. Note if you double click with the mouse on RA input, you can enter an object name to get the position.

Cheers, Han

Last edit: han.k 2022-09-13

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