[Kstars-devel] Catalog artefacts in USNO NOMAD

[Jasem Mutlaq]

I did note that sometimes suddenly a whole patch of stars would cloud a
certain region of the sky. It's random I'm not sure what triggers it. How
did you generate this image exactly? from the eye piece view?

On Wed, Apr 13, 2016 at 6:47 AM, Akarsh Simha <akarshsimha at gmail.com> wrote:

> The attached file seems to be a good example of many artefacts in USNO
> NOMAD, which AFAIK has been generated automatically by analyzing
> images. Here are some consistent cases that I've noticed:
>
> 1. There is a star at the core of every galaxy (easy to filter out)
>
> 2. Sometimes, diffraction spikes around bright stars are turned into a
> chain of stars!
>
> 3. Sometimes, bright single stars are turned into double stars (must
> be another diffraction-spike effect)
>
> 4. Faint companion stars of bright stars tend to be exaggerated in
> brightness.
>
> 5. The star clouds of the milky way have resulted in huge patches of
> stars as artefacts.
>
> Most of the other issues are hard to debug from the catalog. I'm sure
> there is a better catalog? Can we move to it? Stellarium has a 600
> million star catalog, AFAIK? Is it free from such artefacts?
>
> Regards
> Akarsh
>
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>


-- 
Best Regards,
Jasem Mutlaq
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