[AZ-Observing] Re: Recording Seeing Conditions (was WOW!)
- From: "William R Wood" <w.wood@xxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Tue, 12 Jul 2005 09:26:09 -0700
I should correct my last statement below. I don't know how Pickering scales
beyond a 10" scope because that is the biggest size I have ever used. This
is a guess but since the Airy disc gets smaller as scope size increases, the
Pickering scale might fail somewhere above 12" since one probably cannot see
diffraction rings which are essential to the Peach interpretation of the
rating. Andrew has a big scope and he uses a single star to rate seeing so
obviously it can be done. Maybe Andrew will explain what he sees in the 18"
when he measures seeing.
Regards
Bill Wood
> I also feel that the Pickering method is valid for sharing with others if
> one uses a standard reference scale like the Damian Peach rendition. And
> Pickering scales ok with scope size but, if sharing, one should give the
> scope size and star magnitude used to make the measurement. I believe
> scope
> size and star mag is also necessary to know if sharing data using the
> close
> double method.
>
> Regards,
>
> Bill Wood
> Fountain Hills, AZ
>
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