(urth) Tracking Song and vizcacha, and misc.

[Daniel D Jones]

On Sunday 17 June 2007 20:03, Dave Lebling wrote:
> > Well, that wouldn't be a first. So there is another layer there, or
> > several
> > layers in one, as you observe. And you thing this all takes place on an
> > asteroid? That would not be a first either. Can you expand on that at
> > all?
> > It is obviously extremely small, but do asteroids have moons?
>
> Some asteroids do indeed have moons. Check the archives for discussion
> of the size of the setting for "Tracking Song." The Great Sleigh
> circumnavigates it in two weeks (by my memory here), going at a rather
> sedate speed. I suppose it could be a moon, but I think asteroids with
> moons are more common than moons with moons.

How big would an asteroid have to be to maintain an atmosphere?  Could one of 
sufficient size be circumnavigated in two weeks at "rather sedate speeds?"  
(It's possible that Wolfe simply took poetic license, of course.)