Re: [APML] 'challenge'

["John Boudreau" <jeboud@attbi.com>]

----- Original Message -----
From: "stephen pitt" <lthuedk@pe.net>
To: <astro-photo@seds.org>
Sent: Thursday, December 19, 2002 9:49 PM
Subject: Re: [APML] 'challenge'


> Hi John:  If the transit speed is only .2 arc sec/minute, it would be a
> long, long wait b/t exposures to boot.  If I waited 5 hours, saturn will
> have only moved one minute of angle.  Thats not enough distance from M1
> by any means to be free of Saturns light.  This isn't cometary speed. Is
> the .2 arc sec/minute for real?  Stephen

Hi Stephen,

The .2 arcsecs/minute sounds about right for the little I know about this
transit, and since for now I don't own any planetarium software I'll defer
to Kevin Wigell and others that do ;o)

In my case, with a C11, it sounds like I'd have to make the M1 exposure
nearly a week before the transit if I use film. Even if the weather
cooperates my skies are light polluted to the point of having to greatly
underexpose M1. I could use my ST-10 and that would allow a tighter schedule
of  three days or so due to the smaller size of the chip, but along with
little practice with it so far, unfortunatly I don't have the RGB filters
for it yet ;o(

But as Steve Barnes has mentioned, it's sure to be cloudy anyway <g>

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

>
> John Boudreau wrote:
> >
> > ----- Original Message -----
> > From: "stephen pitt" <lthuedk@pe.net>
> > To: <astro-photo@seds.org>
> > Sent: Thursday, December 19, 2002 5:30 PM
> > Subject: Re: [APML] 'challenge'
> >
> > > Brian and Chris: I understand the spirit of the photographic
challenge,
> > > but also think that two scopes acting simultaneously and using only
two
> > > frames is ethical.  Respectfully, Stephen
> >
> > Hi Stephen,
> >
> > This won't work, as your simultaneous long M1 exposure would be terribly
> > flooded out by a horribly overexposed Saturn. According to S&T, Saturn's
> > surface brightness is something like 250,000 x that of M1. The M1 shot
has
> > to be taken when Saturn's not in the scope's FOV around M1.
> >
> > John Boudreau
> > http://home.attbi.com/~jeboud/astro.htm






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