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