[vsnet-obs 38579] Re: [vsnet-chat 5109] Re: Magnitude p of variable stars

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

> The problem is probably due to the fact that often the positions given by the 
> discover are incorrect. Variables discovered on photographic plates often are 
> misidentified. Some of the discovery charts are quite confusing. Brian Skiff 
> has published a number of IBVS issues which give the correct location of some 
> of these stars.

  More serious problem is that these commercial softwares don't usually
show uncertainties nor reflect recent updates in the GCVS.  So users
must refer to the GCVS instead of relying on commercial softwares.
I have also heard that some softwares have their own bugs in addition to
the original uncertainties in the GCVS.  Some programs don't correctly
convert 1950.0 to 2000.0 etc.

Regards,
Taichi Kato

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