[vsnet-chat 5194] Re: About courios observation, no confusion

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

Re: [vsnet-chat 5179] About courios observation, no confusion

Toni,

> Yes, I know the problem of the equinox and epoch.
> Megastar Program version 4.0 is based on equinox 2000.0 and I think also
> epoch 2000.0.
> I use this program to found comets positions.
> Again, General  Catalogue  of  Variable  Stars  4th  edition
> (Kholopov  et  al.  1985-88)
> GSC 1.1 version.
> and
> Astronomical Data Center
> I/239   The Hipparcos and Tycho Catalogues   (ESA 1997)
> The program compute the proper motion of the stars.
> This mean that the program seem to be realiable.

   I don't see clearly the points you see the program to be reliable.
Doesn't the program simply display proper motions (no calculation?)
in the catalog??

   The program at least seems to have faults with variable star
identifications; thus it should be used with extreme care in observing
variable stars (your should at least consult GCVS and check whether
the coordinates are confirmed.  Please always be careful about the
equinox used in any catalogs).

Regards,
Taichi Kato

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