Can I overlay USNO data in Guide 8 to get B-V info? If yes, how
exactly.

--- In guide-user@yahoogroups.com, Bill J Gray <pluto@p...> wrote:
> Hi Jerry,
>
> Unfortunately, you don't get B-V (or any color data) for
> GSC stars. (This is why you can check the "color stars" box
> in Star Info, and still have all the faint stars show up in
> white.) The folks who created GSC got only one magnitude for
> each star... no color data.
>
> I suspect you found the way around this: get data from
> another catalog, such as GSC-2.2, that _does_ have some
> color data. To shut off those labels, right-click on a GSC-2.2
> star, getting the usual "short info" box. Then click on Display.
> You'll see a check-box for labels (as well as options to adjust
> other aspects of how GSC-2.2 is shown: magnitude limits, color,
> fields of view at which it is drawn, etc.)
>
> This is an extremely handy thing to remember, an Important
> Safety Tip: if you see something in Guide and want to turn it
> off, or change its color, or remove its labels, or almost
> anything else, just right-click on it and then on the "Display"
> button. I admit that this isn't a 100% solution (for example,
> you can't right-click on the "horizon objects"), and it only
> works if there's an example object on-screen. But it's quite
> helpful in the sort of situation you describe.
>
> -- Bill