Re: [APML] 'challenge'

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

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

----- Original Message -----
From: "Kevin Wigell" <kwemail@twcny.rr.com>
To: <astro-photo@seds.org>
Sent: Friday, December 20, 2002 11:41 AM
Subject: Re: [APML] 'challenge'


> I'm not sure I understand the urgency to expose the "Saturnless" M1 image
> near the time of the transit. M1 isn't going to change on the time scales
> that we're talking about (IMO changes in M1 itself might be detectable on
> the time scale of years, unless you are talking about Hubble-type
> resolution, then maybe months).
>
> So, unless we're talking about image ethics, does it really make a
> difference whether the Saturnless image is taken a day before or after the
> transit, a week, or a month (or more)? And even including image ethics in
> the equation, does it make any difference (i.e., the difference between a
> day or a month before or after the transit)?
>
> IMO, the answer is "no".
>
> And yes, at least from upstate NY, it's almost certain to be cloudy for
the
> transit itself.
>
> Kevin Wigell
> www.kwastronomy.com
>
> ----- Original Message -----
> From: "John Boudreau" <jeboud@attbi.com>
> To: <astro-photo@seds.org>
> Sent: Friday, December 20, 2002 11:06
> Subject: Re: [APML] 'challenge'
>
>
> >
> > 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
>
>
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