Re: [APML] 'challenge'

[stephen pitt <lthuedk@pe.net>]

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   

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
> 
> ----- 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
> >
> > Brian Lula wrote:
> > >
> > > Hi Chris,
> > >
> > > I agree with you Chris. The real "challenge" is how to optimize this
> event real time
> > > using innovative imaging techniques. It may not look as nice but that's
> not the point. It
> > > also makes for a level playing field with Saturn's brightness coming in
> to play.
> > >
> > > Brian Lula
> > >
> > > On 19 Dec 02, at 15:41, Chris Schur wrote:
> > >
> > > > I have to strongly disagree with those who say its OK to composite an
> image
> > > > and think of it as anything like a challenge.  I can do that tonight,
> with
> > > > an atlas for a guide as to where saturn is going to be, and thats
> cheating.
> > > > Wouldnt it be clever, if we could think of a way to REALLY get the
> image,
> > > > real time?  Not some pasted together fake, but an actual image.  I can
> think
> > > > of several ways to do this.  My first thoughts are to shoot with the
> Ha
> > > > filter and CCD, and determine the maximum exposure in seconds so
> saturn just
> > > > doen not saturate.  Than add bunches of those, that can fit within a
> narrow
> > > > 10 or 15 minute time frame so saturn does not move very far between
> shots.
> > > > You will end of with (I hope!) a black and white REAL image, fully
> > > > appreciated by your peers as a worthy effort to the upcomming january
> 4th
> > > > challenge.
> > > >
> > > > Sorry I feel so strongly about this, but after Astronomy Magazine
> published
> > > > the moon-saturn paste up a number of months back, I shudder at the
> thought
> > > > of what things could come to if this is taken for granted.  I would
> like to
> > > > hear others thoughts on this, the use of masks for example during
> exposure,
> > > > or whatever.
> > > >
> > > > Ok, shoot me.
> > > >
> > > > Chris Schur
> > > >
> 
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