Re: Question (of course)

[Tom Droege <tdroege@veriomail.com>]

Thinking about it, I suspect that Andrew and Rob are thinking of two 
different things.  The Tycho catalog is used to match stars that have good 
position and pretty good photometry.  I think we get lots of stars that are 
not in the Tycho catalog.  We start using the Tycho magnitudes as points in 
our "fit".  Later we generate our own catalog.

I am just answering this to try to get Rob pointed in about the right 
direction.  I hope someone else will explain it better.

Tom

At 05:24 PM 12/27/00 -0700, you wrote:

>Hey all,
>
>I was wondering if we all should use the same catalog to 'find' the stars in
>the Mark IV images?  Would this make it easier to determine the differences
>between methods?
>
>Rob