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Equipment Discussions >> Mounts

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Tarzanrock
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Reged: 12/07/08
Posts: 159
Loc: Los Angeles
Re: AS CG5 GT New Software Alignment/Calibration Stars new [Re: waassaabee]
      #3108999 - 05/16/09 04:32 PM

Hi Gary:
I'll consider doing such when I have some free time available for such a pursuit. Right now I'm still trying to figure it all out.
See, the photograph on the front page of the Los Angeles Times today -- it has a fabulous photograph of two shuttle astronauts repairing the Hubble in their space suits with an interesting reflection of one of them on the mirrored image of the Hubble.
It is one terrific picture.
Why don't you try to get a photo of it through your scope with your astro equipment. It should be easily visible with the shuttle docked alongside of it.

William


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waassaabee
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Re: AS CG5 GT New Software Alignment/Calibration Stars new [Re: Tarzanrock]
      #3109198 - 05/16/09 06:23 PM

I'd have to go use one of the scopes at work to track that fast accurately.

--------------------
Gary

34N 120W

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Tarzanrock
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Reged: 12/07/08
Posts: 159
Loc: Los Angeles
Re: AS CG5 GT New Software Alignment/Calibration Stars new [Re: waassaabee]
      #3128571 - 05/26/09 03:50 PM

I tried the new 4.16 software this past weekend in Joshua Tree. It worked great. I was very impressed with it; and, once I learn how to better use it, I am certain that it will function even be better.
The newest version of the software (4.16) that Celestron provided really improved the mechanical function of the mount -- the mount will now slew in a variety of new directions from where it did not go before. I suspect that there are different filtering limits to the new software as opposed to the old 3.0 version. I can't wait to try it out with the improved firmware upgrade. I brought the AS CG5 GT Mount back to L.A. and I will take it to Celestron sometime later to have it upgraded as well.
By the way, the new software is highly accurate -- on Saturday night, I simply pointed the mount due north, but I did not actually polar align it. I did the 2 star alignment with 4 calibration stars. I let the Mount's computer select the stars: 1.) Capella; 2.) Procyon as the alignment stars; and, in the East, the Mount selected Spica; Arcturus; Mizar; and, Vega. The results were fairly amazing. After the alignment I selected Saturn from the hand control. The Mount slewed to Saturn and it put Saturn slighly off center of a Celestron 40 mm Plossl, i.e. TFOV of 0.72 degree.
Of course, it didn't track too well since it never was polar aligned but the goto's were pretty good and by that I mean bright Messier objects were placed within the field of view of a 31 mm Nagler.
The second night, Sunday, I did the same 2 star alignment with the 4 calibration stars which the Mount's computer selected. Then I did a visual boresight polar alignment through the hole in the Mount. [I had been off by a couple of degrees from the prior night -- where I simply placed the mount in it ususal position and did not polar align it. Polaris was visible at the very top of the boresight hole.] I then refined the polar alignment with the Celestron Polar Alignment Scope by placing Polaris in the center of the cross-hairs with the mount's mechanical adjustment knobs. I did not fine tune the polar alignment any further.
Thereafter I did another 2 star alignment procedure with 4 Eastern calibration stars. This time the alignment stars were 1.) Pollux; 2.) Regulus in the West; and, 3.) Spica; 4.) Mizar; 5.) Arcturus; and, 6. Vega in the East.
I used a 12.5 mm reticuled eyepiece to center and align the stars.
I did not utilize the software's new All Star Polar Alignment function as I wanted to see how accurate the new software was as opposed to the old version.
The accuracy was fairly amazing.
I viewed 60 Messier objects and the Mount slewed to every one and placed each one within the field of view of a 22 Nagler (0.76 degree) or a 17 Nagler (0.59 degree).
I am sure that if I had 1.) fine tuned the alignment on the NCP with a better and more thorough visual boresight alignment with the Polar Scope; 2.) thereafter performed a second Polar Alignment utilizing the All Star Alignment Procedure using either Deneobla; Regulus or Arcturus; and, 3.) more carefully and accurately aligned the 2 alignment stars and the 4 calibration stars -- the alignment would have been far better. I intend to do so the next time I have the opportunity.
William


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LateViewer
scholastic sledgehammer
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Reged: 11/17/05
Posts: 780
Loc: Westchester NY
Re: AS CG5 GT New Software Alignment/Calibration Stars [Re: Tarzanrock]
      #3278252 - 08/17/09 04:56 PM

I read most of this thread.

Wow! You boys got into it! Found it in search.

Al

--------------------
12.5" Discovery Mirror String Truss Dob
DSV-1 Alt-Az Mount
WO 66mm Petzval
Orion 127mm Mak with WO 2" Dielectric Diagonal
C9.25"
Celestron CG-5 GoTo
8.8, 14, 18, and 24mm Meade UWA Series 5000 EP
32, 40mm Orion Optiluxe EP


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