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rlancaste / stellarsolver

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The large image can match the target. Why not the small image? #71

Closed E-Dreamer-LQ closed 2 years ago

E-Dreamer-LQ commented 3 years ago

for example, in this diagram image image Looking forward to your reply and help.

E-Dreamer-LQ commented 3 years ago

This small image is part of the large image.

rlancaste commented 3 years ago

An initial guess would be that perhaps there just aren't enough good sources for astrometry to work with on the subframe. But I would need you to send me the original image(s) that you used to investigate what the reason might be.

E-Dreamer-LQ commented 3 years ago

Thank you for your reply. Would you mind giving your email ? I will send these original image(s) to you by email.

rlancaste commented 3 years ago

So I took a look at your images. The wider scale image appears to have a number of stars in it that astrometry can use to solve. The smaller image has a number of faint galaxies, but I am not sure it has too many stars, definitely a lot less than the big image. That would make it hard for astrometry to solve it. Also, the very small scale makes it more difficult to solve since it would need to search through many more small regions, and thus many many more files, to find a match.