Hi all,<div>I am new to this group. But reading this post I wonder what catalogs Stellarium and Cartes use. Cant we use the same catalogs? They must be available under GPL right?</div><div><br></div><div>Regards,</div><div>
Keerthi. <br><br><div class="gmail_quote">On Sun, Apr 10, 2011 at 11:10 PM, Victor Carbune <span dir="ltr"><<a href="mailto:victor.carbune@gmail.com">victor.carbune@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hi there,<br>
<div><div></div><div class="h5"><br>
On Sun, Apr 10, 2011 at 8:12 PM, Akarsh Simha <<a href="mailto:akarshsimha@gmail.com">akarshsimha@gmail.com</a>> wrote:<br>
> On Sun, Apr 10, 2011 at 02:28:34PM +0200, Massimiliano "Max Negro" Masserelli wrote:<br>
>> I'm in the process of introducing kstars to a local observatory for<br>
>> telescope control. While testing accuracy, I found some problems in<br>
>> pointing (with a 2000mm reflector with 40cm mirror). So I started<br>
>> looking at coordinates stored in catalog, and found "many" errors.<br>
>><br>
>> In particular, Arcturus (alp Boo) has RA 14 15 40.35 Dec 19 11 14.17<br>
>> J2000. If you have a look at simbad<br>
>> (<a href="http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=arcturus&submit=SIMBAD+search" target="_blank">http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=arcturus&submit=SIMBAD+search</a> ) you'll see it should have RA 14 15 39.6720 Dec +19 10 56.677. I then looked at Hipparcos via Vizier (<a href="http://vizier.u-strasbg.fr/viz-bin/VizieR-S?HIP%2069673" target="_blank">http://vizier.u-strasbg.fr/viz-bin/VizieR-S?HIP%2069673</a>) and found that it shows the same coords as kstars, only in J1991.25 epoch (last batch of data on page, as follows):<br>
>><br>
>> ...<br>
>> RAhms 14 15 40.35 Right ascension in h m s, ICRS (J1991.25) (H3)<br>
>> (pos.eq.ra;meta.main)<br>
>> DEdms +19 11 14.2 Declination in deg ' ", ICRS (J1991.25) (H4)<br>
>> (pos.eq.dec;meta.main)<br>
><br>
> Most of our star data comes from Tycho-2 and USNO NOMAD. So that means<br>
> that we got the epoch wrong? So what we thought are J2000.0 data are<br>
> actually J1991.25 data?<br>
><br>
> This should not be very hard to fix once I get the star catalogs back<br>
> on my database.<br>
><br>
>> I tried with a few other objects, and many were in the same conditions,<br>
>> save a few (Albireo, at least, as you can see in<br>
>> <a href="http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=albireo&submit=SIMBAD" target="_blank">http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=albireo&submit=SIMBAD</a><br>
>> +search ).<br>
><br>
>> Deep sky objects seems inaccurate, too, but I wasn't able to find an<br>
>> hint on why...<br>
><br>
> Deep Sky Objects are in general inaccurate in KStars. Do you have any<br>
> suggestions for a standard Deep Sky catalog that is accurate and free<br>
> (as in distributable under terms of the GNU General Public License)?<br>
><br>
> We are allowed to redistribute the Saguaro Astronomy Club's database,<br>
> which is an amateur-compiled database with a lot of observational<br>
> details etc. I plan to merge our NGC / IC database with the broader<br>
> and more accurate SAC database.<br>
><br>
> If you have something more accurate than SAC, that would be great.<br>
</div></div>I'm working right now on moving our current deep data to a database<br>
using sqlite. I'd be glad to know suggestions about deep sky catalogs.<br>
<br>
Are there any other parts in KStars where deep sky objects are stored,<br>
aside from the ngic.dat?<br>
<br>
While doing this port, I just need to mention that we don't really<br>
have a proper parser, independent of kstars of that ngcic.dat file and<br>
the best method seems to just make KStars generate SQL insert queries<br>
while loading it. I spent quite a time trying to port the code to a<br>
generic parser in tools, but KSFileReader seems to include kstars.h<br>
and other things.<br>
<br>
So, here's my question, so I don't work on this in vain: if I just<br>
port all the data from ngcic.dat in a database, is there any reason<br>
why we would ever need that file again?<br>
<font color="#888888"><br>
Victor<br>
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</div></div></blockquote></div><br></div>