[vsnet-chat 5854] Re: GSC vs Tyc2

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

Re: [vsnet-chat 5846] GSC vs Tyc2

> I just examined one image using Tycho-2 catalog.
> Here are results vs previous GSC:
>         GSC    TYC2
> PSCVY  6.08V  6.44V
> ARIZZ  8.06V  8.41V
> 
> Now I'm slight confused. Which one should I use?

   Tycho-2 is the better selection for wide-field photometry.  Yoshida-san
implemented a function to use other catalogs especially for narrow-field
imaging, which will not contain a sufficient number of Tycho-2 stars.
I have proposed to Yoshida-san to use a well-calibrated photometric sequence
(such as the one compiled by B. Skiff), but this function is probably
left for future implementation.

   In case you report corrected observations, please send a list of
past observations which needs to be deleted.  Please ensure that for updated
observations with identical magnitudes with the past submissions, you
must reject them before sending an updated list and the deletion list.
(i.e. You must select the observations with modified magnitudes only.
Please don't try to delete all and add all; in this case, the "deleted"
observations will be permanently deleted even if the same observations
are posted later.  This is because we process the data automatically).
This is the restriction imposed to all when submitting survey-type
observations.  Please keep this in mind.

Regards,
Taichi Kato

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