Page 1 of 1

Astroart 7 and astrometry/photometry

Posted: 17 Dec 2018, 15:54
by Forum_2018
Took some exoplanet transit images with SGP last night.
Some questions:
In star atlas when I do Find, why is coordinates 'Get from image' grayed although image have coordinates ?
Also now after setting manual coordinates and doing find stars and astrometry/photometry I see no N/E orientation mark.
Also should there be coordinates displayed in status bar after doing astrometry ?

BR
Tapio

Re: Astroart 7 and astrometry/photometry

Posted: 17 Dec 2018, 15:54
by Forum_2018
Hi, have you opened the fits header for that image in AstroArt to verify that the coordinates are there? AstroArt puts the telescope Ra/Dec into the fits header when the image is taken if the telescope is connected! Is that what SGP does?

If you've plate solved the image then the N/E orientation mark will be in the upper left corner of the image. Also the Ra/Dec of the cursor on the image will be visible in the status bar.

Iver

Re: Astroart 7 and astrometry/photometry

Posted: 17 Dec 2018, 15:55
by Forum_2018
Okay, here's the fits header taken with AstroArt (only RA,DEC part):
RA = '12:26:06.8'
DEC = '+12:47:29'
OBJCTRA = '12:26:06.8'
OBJCTDEC= '+12:47:29'

And taken with SGP
RA = 6.99825767002523 / Object Right Ascension in degrees
DEC = 42.152548552194 / Object Declination in degrees
CRVAL1 = 6.99825767002523 / RA at image center in degrees
CRVAL2 = 42.152548552194 / DEC at image center in degrees
OBJCTRA = '00 27 59.582' / Object Right Ascension in hms
OBJCTDEC= '+42 09 09.175' / Object Declination in degrees

Re: Astroart 7 and astrometry/photometry

Posted: 17 Dec 2018, 15:55
by Forum_2018
Have you tried the AstroArt image to see if the "Get From Image" is still grayed out?

Iver

Re: Astroart 7 and astrometry/photometry

Posted: 17 Dec 2018, 15:55
by Forum_2018
Yes, with ArtoArt images there is Get from image useable.
Maybe Astroart expects RA and DEC to be in HMS format and not in degrees ?

Funny thing yesterday when tried to do astrometry and using SGP files and manual entering coordinates - it found stars in different part of star atlas when I did search in same image again. Also the orientation of the square in star atlas seemed to change. And no N/E orientation mark.