KStars - NOMAD bugs

[Akarsh Simha]

Hi Vladimir

The problem you are seeing, my guess is that it is inherent to USNO NOMAD.
I believe this is because the catalog was constructed programmatically from
images, so the sequence of stars that you see around bright stars are from
the diffraction spikes or CCD blooming in the image being detected as
stars. I don’t think it’s a bug in KStars. I’ll have to read up more about
the catalog to confirm this.

Regards
Akarsh


On Sat, Sep 11, 2021 at 22:05 Jasem Mutlaq <mutlaqja at ikarustech.com> wrote:

> Hello Vladimir,
>
> First of all, nice work!! The experience is very smooth, though you
> can perhaps improve the pre-caching so that adjacent areas are fetched
> before the user starts panning around.
>
> Regarding NOMAD, this was imported in ~2008 by Akarsh if I remember
> correctly. I have no idea on the specific details, it was using some
> text --> binary converted to index the trixels among other data. Maybe
> something happened during the import process? Are the duplicated stars
> in the binary itself?
>
> I'm including the KStars development list in this conversation so that
> Akarsh and others may shed some light on this. Love the project!
>
> --
> Best Regards,
> Jasem Mutlaq
>
>
> On Sat, Sep 11, 2021 at 11:03 PM vladimir dvorak <lada.dvorak7 at gmail.com>
> wrote:
> >
> >   Hello Jasem,
> >
> > I'm working on opensource online web for visual astronomy with
> interactive charts:
> >
> >
> https://www.czsky.eu/chart?ra=4.829708946247629&dec=-0.2842947426026318&fsz=1
> >
> > it uses compiled UNSO nomad catalog from kstars. I've noticed that some
> stars are duplicated (typically 3 stars instead of 1) in declination
> (chains of triplets).
> > It is visible in the chart that I've sent. The same problem is in kstars
> as well, probably caused by the import from NOMAD. Do you know about this
> problem?
> > Maybe I can help to solve it.
> >
> > thanks, kind regards Vladimir
> >
> > my GH profile is at: https://github.com/skybber
>
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