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pointing accuracy
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Louis A. Mamakos <louie@...>
Hi Colt,Ah, so this makes sense. Based on my experience with some digital setting circles on my G-11 mount (on the waiting list for a 900GTO, sigh), polar alignment doesn't seem significant. That's of course doing a two star alignment. Orthoganality does seem very important during alignment (e.g., the SET DEC=0 step) can be difficult on the G-11 given the lack of a fixed declination axis setting circle. louie
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Ron Wodaski <ronw@...>
I think that pointing accuracy on any of the AP goto mounts is excellent,
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and mostly depends on how well aligned you are to the celestial pole. On nights when I have taken the time for really good polar alignment, objects routinely show up in just about exactly the same spot on the CCD chip. On those nights, it wouldn't matter what camera I was using; objects would be on the chip. <g> To get really high pointing accuracy, you must also make sure that your scope is well aligned to the mount's RA axis, of course. Ron Wodaski
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From: Colt Bednorz [mailto:colt@...] Sent: Saturday, May 06, 2000 8:44 AM To: ap-gto@... Subject: Re: [ap-gto] pointing accuracy Ray, So, it's not only on the chip of a st7/8, but not too far off center. I looked at what u see and that would even hit the st-4's little chip for a standard sct. Thanks Colt Ray Gralak wrote: Hi Colt, ------------------------------------------------------------------------ Would you like to save big on your phone bill -- and keep on saving more each month? Join beMANY! Our huge buying group gives you Long Distance rates which fall monthly, plus an extra $60 in FREE calls! http://click.egroups.com/1/2567/5/_/3615/_/957627549/ ------------------------------------------------------------------------
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Ray Gralak <ray@...>
Hi Colt,
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Yes, from one part of the sky to the opposite side I have seen better than 2-arc-minutes accuracy. To get this kind of accuracy you need to make sure your OTA is orthogonal and that none of the optical elements shift in movement (e.g. many SCT's primary mirrors will shift when you move to another part of the sky). That is why I said I get this accuracy with my refractor. Take care, -Ray
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Colt Bednorz <colt@...>
Ray,
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So, it's not only on the chip of a st7/8, but not too far off center. I looked at what u see and that would even hit the st-4's little chip for a standard sct. Thanks Colt Ray Gralak wrote:
Hi Colt,
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Ray Gralak <ray@...>
Hi Colt,
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With really good polar alignment (and my 5" refractor) I have seen better than 2 arc-minutes accuracy on my 1200 GTO. And most of that error could be from non-perfect polar alignment. Taka care, -Ray Gralak
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Colt Bednorz <colt@...>
What is the pointing accuracy of the A.P.1200?
Assuming everything is accurately set up, and polar aligned, what do you normally get? I would imagine that this feature, which I've never had, is pretty nice for imaging those faint invisible objects. Thanks Colt Bednorz
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