RE: [APML] 'challenge'

["Chris Schur" <cschur@cybertrails.com>]

Kevin, what time and exact date does your software predict central crossing
at MST?
Chris Schur

-----Original Message-----
From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
Behalf Of Kevin Wigell
Sent: Friday, December 20, 2002 10:39 AM
To: astro-photo@seds.org
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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