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Re: (meteorobs) Bob Lunsford's Suggestions/Help & Nov. 19/20 Correction-Marco V.
Thanks, Malcom Currie :). Marco Valois
----- Original Message -----
From: Malcolm J. Currie <mjc@star.rl.acdot uk>
To: <meteorobs@atmob.org>
Sent: Monday, December 01, 2003 3:37 PM
Subject: Re: (meteorobs) Bob Lunsford's Suggestions/Help & Nov. 19/20
Correction-Marco V.
> > This topic jogged an old memory in me. Back in the seventies when I
> > first got started serious meteor observing, one of the data points I
> > recorded on each meteor seen was a column called DCV. This stood for
> > "Distance from Central Vision". Haven't seen this term used or recorded
in
> > a long time.
>
> Quite a few current observers record this parameter. Lew for one.
>
> As Paul points out, it's not just limiting magnitude. That's why IMO
> uses a "perception factor" for each observer, which is converted to a
> shift of the observed LM into an effective LM. I've had a fellow
> observer with a LM 0.8 worse than me, but that was reflected in his
> rates compared with mine. Then I've observed with people with an LM
> close to mine, but don't have the good peripheral vision, and see far
> fewer meteors than I did.
>
> When I observed visually on a regular basis too many years ago, I
> estimated LM much like Mike Linnolt does now, using lots of binocular-
> variable-star charts to estimate the LM, not that LMs > +6.5 were
> accounted for in the 1970s. Also after a while, experience just looking
> at the general sky impression could give a decent estimate of the LM
> to 0.1ish. There were exceptions.
>
> More recently for telescopic and the odd visual session, I do monitor
> the naked-eye LM using the IMO counting method. As someone in a rural
> setting with good sensitivity, I haven't had much difficulty with the
> gaps in the sequences. It's actually having regions with too many stars
> to count that's the most inconvenience. Region to region give
> consistent values to 0.1 or better.
>
> Do we need to define a few more regions with plenty of 5.0-6.0 stars
> to help avoid those large steps in the LM that the original poster was
> bemoaning?
>
> Malcolm Currie
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