Re: big white blobs

Lawrence Jun 27, 2004

Thanks Bill

Although I knew they had come from a previous Internet session, I couldn't see
exactly what they represented - and how to switch them off. As always, you
have come up with the answer. Maybe sometime I'll delve more deeply to find
out about them.

bw

Lawrence


>
>Hi Lawrence,
>
> These are stars from the USNO's B1.0 catalog. (OK, you already knew
>that.) The data was presumably gathered via Internet, as described at
>
>http://www.projectpluto.com/update8b.htm#b1_2mass
>
> The quick, general answer to how you'd shut off this data is exactly
>the same for _any_ object* that is shown with an undesired limiting magnitude,
>or colors, or labels, or at the wrong fields of view, or whatever: you
>click on the object, then on Display, and reset the limiting magnitude,
>or color, or turn the labels on or off, or reset the fields of view at
>which the objects are shown. Or, in this case, maybe just shut them
>off completely. (I'd check first to see what limiting magnitude you have
>set for them. It may be a totally irrational one. When you click on these
>stars, what sort of magnitudes do you see?)
>
> I can't stress this one enough. It's high on the list of things I
>wish I'd thought of for Guide 1.0, instead of waiting until partway
>through Guide 7.0. The only weakness is that to control a dataset this
>way, you have to be able to see it on-screen and click on it. For
>example, if you shut off the B1.0 stars, you'll have to use Extras...
>Toggle User Datasets to turn them back on.
>
> (Before turning off the B1.0 stars, I'd check to see what
>limiting magnitude you have set for them. It may be a totally irrational
>one. When you click on these stars, what sort of magnitudes do you see?
>Where in the sky are these "stars" located?)
>
> If you click on a B1.0 star and ask for 'more info', Guide will inform
>you that the B1.0 downloads accumulate, and will provide an option to
>delete the accumulated data. If you got some corrupted data, that
>"delete accumulated data" may be a good thing to use.
>
>-- Bill