[vsnet-chat 1245] Re: H/T chart vs. VT mags...

[Taichi Kato <tkato>]

Re: [vsnet-chat 1243] H/T chart vs. VT mags...

> With regard to bright sequences any system supporting H/T magnitudes
> makes good sense. There are slight differences between the V and VT
> magnitudes given in the H/T tables. In my experience the VT magnitudes
> agree better to 'darkadapted' visual.

   I have been often wondering whenever I hear dark-adapted visual sensation
is much more blue-sensitive than Johnson V.  I have seen a +0.2(B-V) term,
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...

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

Regards,
Taichi Kato

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