Thanks Bill,

I didn't know that I could open MPCORB.dat as a .txt file with Word.

Actually the intent here is to winnow out some 600 of the brighter
asteroids that I've already viewed to make it easier to identify
those I have yet to visit.

Best regards,

Pete

--- In guide-user@yahoogroups.com, Bill J Gray <pluto@...> wrote:
>
> Hi Pete,
>
> "...Other than opening MPCORB.dat and manually removing the
selected
> asteroids, and then doing an Edit Comet Data from Guide itself, is
> there some way to prevent the display of asteroids that I've already
> observed so that I may more easily spot those that I haven't?
>
> I'm afraid not. I've thought about providing something like
> this (a means to flag "show me only this subset of asteroids",
> or in your case, "_don't_ show me this subset"). But right now,
> the only filtering is magnitude-based.
>
> Incidentally, you _can_ edit MPCORB.DAT in a text editor and
> remove the lines of the offending objects. They will then
> disappear. You won't need to play around with Edit Comet Data
> at all. So I shouldn't say "you can't do it". I should say
> "you'll need to do a bit of text editing."
>
> One advantage of this approach is that if (as I suspect) you're
> just interested in the brighter asteroids, you can edit MPCORB.DAT
> and delete all but the first few thousand lines. This will cause
> Guide to run quite a bit faster. After the first few thousand
> objects, you get into pretty faint territory.
>
> -- Bill
>