[vsnet-id 733] Re: (fwd) Re: [AAVSO-DIS] WW HYA

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

Re: (fwd) Re: [AAVSO-DIS] WW HYA

>      One  of the problems with your listings is that nowhere do you actually
> say which of the many coordinates you show for an object is the preferred
> one.  Also, you seem to using either old catalogues, or possibly the
> coordinates seem to be foro _B2000_, not J2000:
> 
> ...so it looks as though you are using some 'unknown' version of the GSC
> (the original GSC v1.0?), and persist in using USNO-A1.0 even though it has
> been superceded _twice_, and possesses substantial systematic errors in
> the coordinates inherited from the GSC v1.1.

   I didn't want to show the best astrometry, but simply to show the
identifications.  Compared to the original 1 degree problem, subtle
differences between catalogs are not a problem.  When the accuracy
is important, we insist on providing the best astrometric material,
as we have been doing with outbursting CV identifications.

   For your information, I used GSC 1.1.  I downloaded the catalog at
the epoch of the early release, so there may be a slight difference
from the final version.

Regards,
Taichi Kato

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