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Thread: Astroart 7 and astrometry/photometry

  1. #1

    Astroart 7 and astrometry/photometry

    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 ?


  2. #2
    Join Date
    May 2012
    Monterey county Ca.
    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.
    Last edited by Iver; 30 Sep 2018 at 18:30.

  3. #3
    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

  4. #4
    Join Date
    May 2012
    Monterey county Ca.
    Have you tried the AstroArt image to see if the "Get From Image" is still grayed out?

  5. #5
    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.

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