RE: [APML] 'challenge'

["Richard Klappal" <klappal@xnet.com>]

I just created/posted a transit map at http://home.xnet.com/~klappal. Click on
the image to download it. The times on the map are North American Central Std
Time. Add 6 hours for UTC.

-----Original Message-----
From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
Behalf Of John Boudreau
Sent: Friday, December 20, 2002 12:00
To: astro-photo@seds.org
Subject: Re: [APML] 'challenge'


Hi Kevin,

Thanks for the transit info. It just dawned on me that setting up as I
mentioned for a double exposure would also allow multiple exposures of
Saturn on that same frame during the transit, showing Saturn's relative
motion across M1 for at least a few hours.

If enough people try it, someone is sure get lucky with the weather and
their equipment and succeed.

John Boudreau
http://home.attbi.com/~jeboud/astro.htm

----- Original Message -----
From: "Kevin Wigell" <kwemail@twcny.rr.com>
To: <astro-photo@seds.org>
Sent: Friday, December 20, 2002 12:39 PM
Subject: Re: [APML] 'challenge'


> I gotcha now, John, thanks for the explanation.
>
> BTW, I ran another, more precise, simulation of the transit, and Saturn's
> angular speed is just about 0.18 arc-sec per minute. At this rate, it
takes
> about 31 hours to completely transit the Crab.
>
> Kevin
> www.kwastronomy.com
>
> ----- Original Message -----
> From: "John Boudreau" <jeboud@attbi.com>
> To: <astro-photo@seds.org>
> Sent: Friday, December 20, 2002 12:22
> Subject: Re: [APML] 'challenge'
>
>
> > Hi Kevin,
> >
> > My reasoning behind this is to be able to leave the scope setup with the
> > orientation of the camera, OAG, and ST4 _untouched_ between the M1 and
> > Saturn exposures using the same film frame for a double exposure. That's
> > _only_ intended to get the best possible alignment of Saturn and M1 in
the
> > image. For the Saturn exposure the guide star used for the earlier M1
shot
> > could then be put on the same position on the ST4's CCD. Obviously for a
> > number of reasons, the fewer days the scope has to be left setup like
> this,
> > the better. It has nothing to do with trying to get the timing as close
as
> > possible for "ethical" reasons.
> >
> > John Boudreau
> > http://home.attbi.com/~jeboud/astro.htm
> >
>
>
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