Bill,

This is exactly what I was looking for. I had to use the A2 to fill the
gap when the UCAC3 were on. As an example, if UCAC3 is the only use
catalog, Regulus will not be drawn as it is not in the UCAC3 catalog. I
used the A2 to display it. Sometimes I would miss as the A2 is drawn
using a magnitude setting while the UCAC3 uses field size.

Having the Tycho catalog drawn with the UCAC3 will fix that problem.

Thanks Bill

Denis

On 25/07/2010 11:46 AM, Bill J Gray wrote:
> Hello all,
>
> My thanks to all for pitching in on trying to puzzle this out.
> The error was subtle (obviously, or we'd have figured it out
> long ago), and it's due to something I did, not anything Microsoft
> (or Clay or anyone else) did.
>
> I was going to send Clay a "test" version with lots of debugging
> code to track down exactly where things went astray. In the process
> of adding that code, I spotted what I'd done wrong.
>
> The issue is this. A while back, I added to Guide the ability
> to display UCAC-3 files from the "raw" eight-GByte dataset distributed
> by USNO on two DVDs:
>
> http://www.projectpluto.com/update8e.htm#ucac3_hd_dvd
>
> I don't think many people are making use of this capability. There
> aren't a lot of UCAC-3 disks out there, and the benefit of using the
> raw data appears to be marginal in most cases. (Note that this is
> a controversial viewpoint, but there are definitely some weird things
> going on in UCAC-3 that we all wish weren't there.)
>
> Anyway. Clay _is_ one of those people. Maybe the only one. And
> it turns out that I added code to Guide that basically says, "If you've
> drawn UCAC-3 stars, you've drawn _all_ stars; don't bother looking
> at GSC or Tycho-2 or other datasets." The idea was to avoid having
> stars drawn twice, as false doubles. The problem is that if those
> other datasets don't get drawn, the labels associated with them don't
> get drawn either.
>
> Once I noticed this, I was able to replicate the bug. _All_ star
> labels, including common names, vanished if I was zoomed in to the
> point where UCAC-3 was being used. (At higher levels, the star labels
> came back on.)
>
> Fortunately, there is a way around this. The UCAC-3 stars are
> flagged as to whether they exist in Tycho-2. I will revise Guide to
> display "UCAC-3 not in Tycho-2", and then Tycho-2. I ought to be
> able to post this fix later today (it's about two lines of code, but
> I need to make sure that fixing one bug doesn't breed three more).
>
> Thanks! -- Bill
>
>
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