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### Plate solving problems using script

Posted: 08 Sep 2020, 15:47
Hello,
unfortunately I have some problems with plate solving using the script function "image.findcoordinates" in Astroart 6.
This is the code I used:
image.open("D:\test\M31_frame1.fit")
ra = 10
de = 40
res=image.findcoordinates(ra,de,5,3)
if res then
rap=image.ra
dep=image.dec
print "plate center coordinates:"; rap;dep
endif
image.close()
If I open the same image in the GUI, plate solving with the "search coordinates" tool is possible (same starting values of Ra and Dec and search field = 3° x 3°). The parameters for the image field, rotation angle, etc. are stored.
Where is the bug?

Best regards
Gerd

### Re: Plate solving problems using script

Posted: 08 Sep 2020, 17:47
Hello,
RA in scripts is always expressed as 0..24, so the RA of andromeda is 0.7 (0 + 42/60) or just (10° / 15).

By the way, if the telescope saves the approximate coordinates in the FITS header (OBJCTRA, OBJCTDEC, etc.), there's no need to prepare the coordinates, just use:

res = Image.FindCoordinates(ra, de, 5, 3)
...

Does this solve?

### Re: Plate solving problems using script

Posted: 08 Sep 2020, 21:27
Dear Fabio,
thank you, ra in hours not degrees, that solves my problem.

RA = 10.8009865294237 / Object Right Ascension in degrees
DEC = 41.3728821732891 / Object Declination in degrees
CRVAL1 = 10.8009865294237 / RA at image center in degrees
CRVAL2 = 41.3728821732891 / DEC at image center in degrees
OBJCTRA = '00 43 12.237' / Object Right Ascension in hms
OBJCTDEC= '+41 22 22.376' / Object Declination in degrees

Best regards
Gerd

### Re: Plate solving problems using script

Posted: 09 Sep 2020, 02:47
Hello, this may happen because in AA6 also RA and DEC keywords are used for EstimateRaDec, and they have higher priority, so RA is read in degrees but it's expected in H,M,S. You may solve with:

ra = Image.GetKey("CRVAL1") / 15
de = Image.GetKey("CRVAL2")
print ra,de
res = Image.FindCoordinates(ra, de, 5, 3)
...
...

### Re: Plate solving problems using script

Posted: 09 Sep 2020, 08:37
Hello Fabio,