Thanks Bill (and Masaki) that's useful to know. I was aware of the
limitations of the GSC and the advantages of 3UCAC but be able to
bring up the GSC again is definitely handy.

Cheers,
Roger

----- Original Message -----
From: "Bill J Gray" <pluto@...>
To: <guide-user@yahoogroups.com>
Sent: Saturday, December 03, 2011 3:56 AM
Subject: Re: [guide-user] GSC Stars


> Hi Roger,
>
> _Mostly_, you'll want to leave GSC off... because 99% of the
> time,
> 3UCAC is a better way to go; it'll show more stars that are
> actually there
> and fewer that aren't. But there are some exceptions. In
> particular,
> there were some "dropouts" in 3UCAC, and this appears to be one of
> them.
>
> As Masaki Kouda points out, GSC is still provided on the Guide 9
> DVD,
> even though by default, it's not used for star charting. My
> thinking was
> that you'd still want to be able to do things such as tell Guide to
> go to
> GSC 2764-1639. However, I didn't rip out the GSC display code,
> and you
> can tell Guide to go back to use of GSC.
>
> To do so, hit Alt-J and enter 12. Most of the faint stars will
> appear
> and you'll be back to a GSC-based display (and the eclipsing binary
> in
> question will appear). Hit Alt-J and enter 12 again, and Guide
> will go
> back to showing 3UCAC.
>
> I actually have plans to fix the 3UCAC "dropout" problem. I did
> a
> comparison to 2UCAC, extracting stars from the latter that didn't
> have
> a nearby 3UCAC counterpart. 2UCAC doesn't have much in the way of
> false
> stars. My assumption is that if a star is in 2UCAC and isn't in
> 3UCAC,
> 3UCAC is wrong: the star really does exist.
>
> Anyway. This resulted in a subset of 2UCAC, which I put on the
> Guide
> 9 DVD. So the data is present. I didn't have time to get it to
> actually
> display yet, but don't think that will be a big deal. When it
> does,
> the "dropouts" will vanish... at least, in the zone where 2UCAC
> data was
> available, which is for everything south of declination +48 or so.
>
> -- Bill
>
>
>
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