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Cant platesolve this image in any of the three color channels for the life of me Pleiades Astrophoto PixInsight · Emilio Frangella · ... · 19 · 1177 · 11

_The3D_ 2.86
Emilio Frangella
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I have been trying for months to platesolve any of the three color channels of this image with no success. I tried with both remote and local catalogs (GAIA). The error is the usual 

*** Error: Unable to find an initial linear transformation.


Here is the file


https://www.dropbox.com/scl/fi/0ezlg2miphetuwx8vm99c/masterLight_BIN-2_4144x2824_EXPOSURE-180.00s_FILTER-R_mono_drizzle_1x_-1-_autocrop.xisf?rlkey=eakpdf69yhu2bld7t72uwn85d&st=om8p6aeu&dl=0


Any help would be appreciated, thanks
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Giulio 1.51
Giulio Ercolani
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It seems strange to me, I did plate solving without any problems with the default settingsUntitled-1.jpg
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PaulTrimby 0.00
Paul Trimby
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Solved with default settings using GAIA DBs
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mxpwr 7.29
D. Jung
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If I try to solve with the GAIA catalogue i downloaded (up to gdr3sp-1.0.0-04.xpsd) it fails. If i select "Online" and Gaia DR2 it solves. Checking at the star magnitudes in the image with ASTAP, my best guess is that most of the stars are fairly dim and PI cannot find enough stars in the area to do a plate solve if you select the downloaded catalogue?
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afd33 5.87
Quinn Groessl
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I'm assuming you're using Pixinsight, any time I've had problems this script has bailed me out. Seti Astro's Blind Solver 2000. Found with a ton of his other great scripts at his repository: https://raw.githubusercontent.com/setiastro/pixinsight-updates/main/
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stormbringerx 0.00
stormbringerx
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Solved without issues with local GAIA catalogues. 
Screenshot 2025-04-21 145716.png
List of local GAIA files
image.png
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nitesky 0.00
James Patterson
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I downloaded your file and had no problems plate solving in PI using the supplied information. I have had quite a few of my mine that I couldn't plate solve as well though. I was not able to find a reason why on mine.
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_The3D_ 2.86
Emilio Frangella
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D. Jung:
If I try to solve with the GAIA catalogue i downloaded (up to gdr3sp-1.0.0-04.xpsd) it fails. If i select "Online" and Gaia DR2 it solves. Checking at the star magnitudes in the image with ASTAP, my best guess is that most of the stars are fairly dim and PI cannot find enough stars in the area to do a plate solve if you select the downloaded catalogue?

damn this worked like a charm. Thanks a lot!
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DorteJP 0.00
Jean-Pierre Dorte
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Do not understand you difficulties I solved this image without any difficulties. Check if Astrometry's path to GAIA remains valid and you have star data baises available
image.png
image.png
image.png
Here is the result:
"

Creation time ............ 2025-04-21 12:43:24 UTC

Creation software ........ PixInsight 1.9.3 / ImageSolver 6.3.1 (Windows)

Reference catalog ........ Gaia DR2

Linear transformation matrix (native[l,b] = matrix * image[x,y]):

+1.52203949e-05 +1.27316586e-04 -2.04341516e-01

-1.27280188e-04 +1.52156085e-05 +2.33772442e-01

WCS transformation ....... DDM thin plate spline

Control points ........... 78

Spline lengths ........... l:78 b:78 X:78 Y:78

Projection ............... Gnomonic

Projection origin ........ [1999.960854 1365.896841] px -> [RA: 11 05 45.514 Dec: -0 01 33.15]

Resolution ............... 0.462 arcsec/px

Rotation ................. -96.825 deg

Reference system ......... ICRS

Observation start time ... 2025-01-07 00:38:55 UTC

Observation end time ..... 2025-02-05 02:16:15 UTC

Geodetic coordinates ..... 7 48 00 W 31 12 00 N 2800 m

Focal distance ........... 2073.65 mm

Pixel size ............... 4.64 um

Field of view ............ 30' 46.2" x 21' 0.9"

Image center ............. RA: 11 05 45.514 Dec: -0 01 33.15 ex: +0.000555 px ey: +0.002776 px

Image bounds:

top-left .............. RA: 11 04 56.599 Dec: +0 12 26.47 ex: -1.180681 px ey: -1.724249 px

top-right ............. RA: 11 05 11.124 Dec: -0 18 04.42 ex: +2.069252 px ey: -1.214467 px

bottom-left ........... RA: 11 06 19.898 Dec: +0 14 55.43 ex: -1.159855 px ey: +0.119755 px

bottom-right .......... RA: 11 06 34.545 Dec: -0 15 34.31 ex: +1.104271 px ey: +0.116841 px"
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PaulTrimby 0.00
Paul Trimby
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Plate solving requires GAIA files dr3 not dr3sp, which are for use with SPCC
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olnilsa 0.00
Peter Christensen
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Did you try to "Search" for the name of the object?
This often makes it possible for the IS to solve the file.
If i do the "Search" for the NGC 3521 - the IS easily resolves the PHOTO.
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AstroCinema 0.00
Peter Assmann
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Maybe you only installed the dr3 catalog. You need to install the complete dr3 catalog and the complete dr3/sp catalog. I had the same problem, but after fully installing the catalogs, the error was resolved.
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AstroMikeAZ 1.20
Mike McDowell
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I had the same experience of others. PI plate solved the image without problem. NGC 3521 as the central galaxy.
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CCDnOES 7.55
Bill McLaughlin
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Just FYI and maybe not related but until the most recent major PI release, My images would solve with every filter but the green. Very Odd. After the new version it now works with all filters. No idea why.
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joc 0.00
CAMMILLERI JEAN OLIVIER
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Emilio Frangella:
I have been trying for months to platesolve any of the three color channels of this image with no success. I tried with both remote and local catalogs (GAIA). The error is the usual 

*** Error: Unable to find an initial linear transformation.
Perhaps the plate solve  don't support drizzle or distortion correction. Are you sure that your picture is linear.
by the way , if you necessite a plate dolve. You can use a script, I think there is a lot of  différents way to solve it.

Here is the file


https://www.dropbox.com/scl/fi/0ezlg2miphetuwx8vm99c/masterLight_BIN-2_4144x2824_EXPOSURE-180.00s_FILTER-R_mono_drizzle_1x_-1-_autocrop.xisf?rlkey=eakpdf69yhu2bld7t72uwn85d&st=om8p6aeu&dl=0


Any help would be appreciated, thanks

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joc 0.00
CAMMILLERI JEAN OLIVIER
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Perhaps the plate solve  don't support drizzle or distortion correction. Are you sure that your picture is linear.
by the way , if you necessite a plate dolve. You can use a script, I think there is a lot of  différents way to solve it.
Emilio Frangella:
I have been trying for months to platesolve any of the three color channels of this image with no success. I tried with both remote and local catalogs (GAIA). The error is the usual 

*** Error: Unable to find an initial linear transformation.


Here is the file


https://www.dropbox.com/scl/fi/0ezlg2miphetuwx8vm99c/masterLight_BIN-2_4144x2824_EXPOSURE-180.00s_FILTER-R_mono_drizzle_1x_-1-_autocrop.xisf?rlkey=eakpdf69yhu2bld7t72uwn85d&st=om8p6aeu&dl=0


Any help would be appreciated, thanks

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PaoloMoroni 0.00
PaoloMoroni
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I solved the problem by first doing the plate solve with the ASTAP program and then setting Pixinsight's Image Solve to the following mode: On line Catalog must be selected, then Gaia Dr2 and reporting the coordinates provided by Astap.n 1.jpgn 2.jpgn 3.jpg
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Die_Launische_Diva 11.34
Die Launische Diva
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Let me be one more data point of success solving your image with no issues at all! Great data btw! 🙂
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warble_master 4.52
AmyWarble
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Check your GAIA configuration.  GAIA takes two sets of data files: DR3 and DR3/SP.  The first set is used for plate solving, the SP set includes spectral data for color calibration.  If you assign one set of files to the other list, it causes glitches on some images.

gaia1.pnggaia2.png
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bobthemac 0.90
Bob McInteer
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If the configurations above are in place and you still have a thorny plate solve, something to try is enabling exhaustive star matching (under Advanced Parameters).
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