[vsnet-chat 1259] Re: H/T chart vs. VT mags...

["Fraser Farrell" <fraserf@dove.net.au>]

G'day all,


> and even +0.5(B-V).  From my experience and estimates of other observers
> in my country, such large positive term is incredible.  Perhaps Japanese
> observers are red-sentive (less adapted to catacluysmics ;-), or they too
> suffer from the light pollution to fully attain dark adaptation...

My guess would be light pollution.  I have noticed on many occasions how
a starfield being observed will suddenly change character when my local
football club finally turns off its floodlights!  There is a similar
(but slower) effect when the Moon rises or sets.

Perhaps the equation should read :
 (visual mag) = V + 0.2(B-V) + (streetlight density factor)  ?  ;-)

> I have heard comet observers use VT rather than V.  I would love to hear
> comments from them also.

I know that Bill Bradfield uses V mags (from a variety of printed
sources), because he doesn't have access to VT mags (or a computer).
Justin Tilbrook works from the closest variable star sequence (usually V
or SPv from VSS RASNZ).  I still use V to maintain consistency with my
historical estimates.


cheers,
Fraser Farrell

http://vsnet.dove.net.au/~fraserf/  email: fraserf@dove.net.au
traditional: PO Box 332, Christies Beach, SA 5165, Australia

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