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Hi folks,<br>
<br>
I think we have to crossmatch WDS with Tycho-2 and/or USNO (which
one btw?). Crossmatches can be done on identifiers (if both catalogs
ship identifiers of one common catalog) or on position. A very easy
to go solution is <a class="moz-txt-link-freetext" href="http://cdsxmatch.u-strasbg.fr/xmatch">http://cdsxmatch.u-strasbg.fr/xmatch</a> but using
more powerful tools like Topcat or PyVO (be sure to use latest
version) allows you to select columns from both catalogs, doing
inner and outer joins using ADQL (astronomy relatex SQL dialect) and
TAP services. For example we could create a Tycho-2 with just an WDS
identifier in addition in that way. Or a WDS with Tycho-2
identifiers in addition. Or any other combination of both tables.<br>
<br>
Btw: Almost all catalogs (notable exception: Steinicke NGC) are
availabe on VizieR: <a class="moz-txt-link-freetext" href="http://vizier.u-strasbg.fr/viz-bin/VizieR">http://vizier.u-strasbg.fr/viz-bin/VizieR</a><br>
<br>
Greetings,<br>
Christian<br>
<br>
<br>
<div class="moz-cite-prefix">On 12/05/2016 09:56 AM, Jasem Mutlaq
wrote:<br>
</div>
<blockquote
cite="mid:CAE0bU5kzTxt8=GFGkGPW96xSpT0SpfN51YBs9S0GT2_AeMbL1Q@mail.gmail.com"
type="cite">
<div dir="ltr">Hello folks,
<div><br>
</div>
<div>So I'd like to make the WDS as an addon catalog: <a
moz-do-not-send="true"
href="http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/WDS">http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/WDS</a></div>
<div><br>
</div>
<div>Note that I have problems accessing the website, I can only
see the main page but any links within timeout.</div>
<div><br>
</div>
<div>So what would be the best way to go on about this? The
stars are "named", and a lot them are duplicates of either the
static named/unnamed stars, or Tycho-2/USNO stars. So what are
the recommended solution?</div>
<div><br>
</div>
<div>1. Import them as is "new stars" and ignore duplication. We
need metadata for angular separation and position angle, and
magnitudes of 1st and 2nd components.</div>
<div>2. "Extend" static/tycho/usno stars with the
cross-reference information provided by WDS? We might miss
some stars that are not found in either of those catalogs,
highly unlikely, but possible.</div>
<div><br>
</div>
<div>In either case, we need to extend the "metadata".</div>
<div><br>
</div>
<div>On another note, I was checking
DeepStarComponent::loadStaticStars() and found that after each
record read, it checks if it is 16 or 32 bytes. Can you mix
16/32 bytes within a single file?? If not, then no need to
perform such a check after each record unnecessarily.
<div><br>
</div>
-- <br>
<div class="gmail_signature">
<div dir="ltr">
<div>Best Regards,<br>
Jasem Mutlaq<br>
</div>
<div><br>
</div>
</div>
</div>
</div>
</div>
</blockquote>
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