Re: Uploaded TASS_DBMS_22JAN98.tgz, GSC and Tycho.

[BARTHOLDI Paul <Paul.Bartholdi@obs.unige.ch>]

> ...
> 
>      One other option I think may help is to "seed" our tass
>      catalog from Tycho and/or GSC.
> 
> This is a good idea for two reasons.  First it gives a cross reference
> from TASS stars to Tycho and the GSC.  Second the GSC will help  us to
> determine, except for gaps in the GSC, if there are two or more stars
> underlying a single TASS "star".

Just a caution, do not forget to take proper motion into account, GSC and
Tycho are not very old, but red dwarfs tend to have large proper motions.
Of course this is not to say that you should not use these catalogues. they
probably have now the best large set of proper motions available.

Best regards,
                  Paul


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