Re: AstroImageJ won't build Master bias

Posted by karenacollins on Jul 23, 2020; 6:50am
URL: http://astroimagej.170.s1.nabble.com/AstroImageJ-won-t-build-Master-bias-tp644p1404.html

That is correct.

Karen

On 7/22/2020 12:54 PM, elahe lashgari [via AstroImageJ] wrote:

Dear Karen,

Thanks for your answer. so as I understood, I should first prepare my images. it means that if I have 106 images for instance, I need first to write EXPTIME and DATE-OBS in the Header one by one.this way AIJ will provide me with new header data. 

Thanks ,

Ela

On Tue, Jul 14, 2020 at 10:39 AM karenacollins [via AstroImageJ] <[hidden email]> wrote:

The biggest limitation to your current formatting (either jpg or FITS) is that you do not have DATE-OBS or EXPTIME keywords in the header. The DATE-OBS keyword let's AIJ know the start time of the observations and then combined with the EXPTIME keyword can calculate the center time of the exposure. Without that information, almost no new header data can be calculated, and when you plot photometry, AIJ will not know the time for each specific measurement, so will only be able to plot photometry in numeric sequence relative to the order each image is processed.

You may be able to add this information by hand (if you know the start time of each exposure), but it would be tedious work unless you only have a few exposures to process.





Karen

On 7/13/2020 7:18 AM, elahe lashgari [via AstroImageJ] wrote:

Dear Karen,

yes, thanks a lot. after updating to daily build, JPG images also work. but as you said before, with FITS it goes better. if I turn off FITS header update, I will lose some information in my final measurements table, right? I plot a light curve of binary stars without doing plate solve. does it make any problem without plate solve?
I also need to choose a reference star in multi-plot photometry. how can I do that? because after I select Target star with that green aperture,  the rest of my selections appeared to be comparisons and not a reference star.

Thanks,

Ela

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