[vsnet-chat 193] V versus v Re to vsnet-chat 181

[Roland.Boninsegna@gate71.be (Roland Boninsegna)]

Stan Walker wrote:

>The point I am making at some length is that in the areas where visual
measures are most valuable - measuring the long-term behaviour of the
large magnitude variations in stars the discrepancies between v and V
don't matter. Any variations between the two systems are submerged in the
noise of the visual measures or can be scaled out when comparing light
curves.




>The discrepancies between v and V don't matter even for visual estimates of
short
period variable stars. A determination of the time of a minimum, made on an
eclipsing star, from visual estimates, will be as valuable as a
photoelectric one
(especially if no photoelectric measures has been done!). The choice of correct
comparison stars is the most important. The Hipparcos and Tycho catalogues will
help a lot.

Regards                         Roland BONINSEGNA
Roland Boninsegna				Asteroidal Occultations (EAON)
Rue de Mariembourg, 35		Observations of Suspected Variable Stars (GEOS)	
B  5670  Dourbes				Astronomy teaching (EAAE)
Tel: + 32 60 399925			E-mail: roland.boninsegna@gate71.be

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