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Subject: Re: [M]: LX200 - Polaris is visible - 2nd alignment star is not
From: Ralph P. Pass III
Reply To: mapug@shore.net
Date: Sun Jul 02 06:45:51 2000
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While you're here, how about checking out the
Astronomy Book
List ? |
Just press enter, select a visible star, press GOTO, use the keypad buttons to center, and then press and hold enter until it beeps.
I am of the opinion that using Polaris and the same star does not converge as fast as it could. I use this technique to alternate the 'second' star to get better convergence.
You should be aware that there are two conditions where the alignment technique has a problem. The first is when the selected second star is around RA 2h 30m (the technique can converge to an arbitrary solution). The second is when the selected second star is around 14h 30m (where the technique can oscillate and never converge). Each of this is due to the geometry of the stars and not the alignment technique. The solution is very simple. Do as suggested above. Simply press enter and then go to a star away from these bad RAs, center, and sync.
Ralph Pass
Tim Hager wrote:
> Thanks to Joe for his answer to my power cord question. The subject
> line says it all. I have the LX200 on the superwedge and I'm trying to
> polar align for some CCD imaging. I set the scope to 00 HA and +90 deg
> and it slews to Polaris. I use the wedge controls to center Polaris and
> then the scope slews to "a Meade alignment star" which in my case happens
> to be Antares which is 10-20 below my south tree line. Is there any way
> that I can make the scope use another star which is actually visible? In
> other words, how can I tell it what star to use as the second
> alignment star?
>
> --------------------------------------------
> New Milford, CT
> USA
> --------------------------------------------
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