Re: AstroImageJ won't build Master bias

Posted by elahe lashgari on Jul 22, 2020; 4:54pm
URL: http://astroimagej.170.s1.nabble.com/AstroImageJ-won-t-build-Master-bias-tp644p1403.html

Dear Karen,

Thanks for your answer.
AIJ plotted the light curve. the only problem is that I don't have JD time or BJD(TDB) time in my measurement table. 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] <
[e-mail]> 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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