Re: [Astrometry] Solved in Tycho II but failed in Gaia.

[Dustin Lang‏]

This is not surprising.  Your image is > 6 degrees wide.  The 5200-series only covers up to scale 6, ie, will work on images up to about 1 degree across.

cheers,

--dustin

On Wed, Dec 1, 2021 at 8:33 PM Shen Ming <bubu...@gmail.com> wrote:

Dear all:

    I was handling a fits file.

    I tried to solve it with Tycho 2 first, every thing is ok:

    When I tried to solve it with index 5200,  it failed by reporting 'CPU time limit'. Thus I added the arguments -L -H -u derived from Tycho2 results, the program told me  'did not solve', please see the snapshot attached:

BTW: I also tried 2mass (index 4200) , the result looks similar to the Tycho 2. 

I wonder what's happening in GAIA situation.

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[Toni Šarić‏]

How do you know which 41xx indexes to download based on the width of your image?

README says how to calculate for 42xx indexes, but nothing for 41xx series.

[Dustin Lang‏]

The scales are the same between 41xx and 42xx -- xx == xx.

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[Toni Šarić‏]

Oh great, thanks.

I just tried 4100 series, and it seems that it gives more precise results (so far).

Thanks