Re: [MaxImDL] Question about the track box in AG


Mar 10, 2006

 


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#23365 Mar 10, 2006

Hello Group:

I have a question for the track box or window, when autoguiding [AG].

When one is guiding and the track box shows a star, if one sees the star

move in the track box no matter how slight,

is that a result of a correction being sent ?

Also is it possible to display a grid or cross hair on the trackbox ? Is

it possible to distinguish between a correction and a non correction in the

track box ? Can one tell if the reason that the star moved was due to

the error rate in the mount or due to the AG sending a correction.?

Thanks alot



Sam



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#23369 Mar 10, 2006

A correction is calculated after each frame is downloaded. So when you see

the star move, you are seeing this before the correction. Ideally, a move

towards the center is partly the result of a previous correction, but that

isn't so easy to determine in real time. Also, a move away from the center

could be the product of an overcorrection on the previous cycle. A certain

amount of wiggling of the star image is normal, depending on your mount and

seeing conditions. You could try comparing the observed movement in the

guider window with the results reported in the guider track log or the

guider track plot, although I don't really see how much value that would be.

The best way to analyze the guiding performance is by post processing the

track log. I keep the track plot window open all the time I'm guiding; if

anything gets weird, or the wind kicks up a bit too much, it is very obvious

there.



You can turn on crosshairs in the guider window just like you do in any

image: right click it and select that option from the context menu.



Chris



*****************************************

Chris L Peterson

Cloudbait Observatory

www.cloudbait.com



----- Original Message -----

From: "Sam Barziza" sbarziza@...>

To: MaxImDL@yahoogroups.com>

Sent: Friday, March 10, 2006 5:46 AM

Subject: [MaxImDL] Question about the track box in AG





> Hello Group:

> I have a question for the track box or window, when autoguiding [AG].

> When one is guiding and the track box shows a star, if one sees the star

> move in the track box no matter how slight,

> is that a result of a correction being sent ?

> Also is it possible to display a grid or cross hair on the trackbox ? Is

> it possible to distinguish between a correction and a non correction in

> the

> track box ? Can one tell if the reason that the star moved was due to

> the error rate in the mount or due to the AG sending a correction.?

> Thanks alot

>

> Sam



----------------------------

#23370 Mar 10, 2006

Sam Barziza wrote: >

> Hello Group:

> I have a question for the track box or window, when autoguiding [AG].

> When one is guiding and the track box shows a star, if one sees the star

> move in the track box no matter how slight,

> is that a result of a correction being sent ?



No, that's the result of the star drifting off. The star has to move off-center

by some measurable amount before we can make a correction. Occasionally the

star will move further than average due to seeing, or a gust of wind, or lumpy

gears, or whatever. The next correction should pull it back.

> Also is it possible to display a grid or cross hair on the trackbox ? Is

> it possible to distinguish between a correction and a non correction in the

> track box ? Can one tell if the reason that the star moved was due to

> the error rate in the mount or due to the AG sending a correction.?

> Thanks alot



The crosshair control is on the right-click menu.



The graphical track log is probably the best way to suss out what is happening

with the corrections.



Doug



---------------



Doug George

dgeorge@...



Diffraction Limited

Makers of Cyanogen Imaging Products

www.cyanogen.com



25 Conover Street

Ottawa, Ontario,

Canada, K2G 4C3



Phone: (613) 225-2732

Fax: (613) 225-9688



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