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  1. #1
    andyst4545's Avatar
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    Default GLP for Rough Polar Alignment



    Anyone ever tried this? I found a copper plumbing do-dad and used some painters tape to fit a green laser pointer in the polar scope hole of my CG5-GT.




    The thing is, I'm not entirely sure how much distance away from Polaris and toward Kochab to aim. I've been guessing about the width of a full moon or two.
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  3. #2
    KathyNS's Avatar
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    Quote Originally Posted by andyst4545 View Post
    The thing is, I'm not entirely sure how much distance away from Polaris and toward Kochab to aim. I've been guessing about the width of a full moon or two.
    Very creative! Polaris is about 3/4 of a degree from the pole, so 1.5 moon widths is about right.

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    Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on
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    pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome;
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    Default

    Cool idea! I hope it works for you.

    Just remember that if you use that at a star party you may suddenly be very unpopular.

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    KathyNS's Avatar
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    Are you going to keep it permanently in the finder scope mount? If not, then be sure to collimate it each time you insert it. Adjust the polar scope mount screws until the GLP beam points to the same spot without moving while you rotate the RA axis through 180 degrees.

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    Default

    Thanks for the idea! I have the same mount. Time to go to Home Depot...
    Saw
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    on Mauna Kea and was hooked immediately!
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    Default

    Andy,
    Try this free software "PolarFinder"
    SFAAA Downloads - South Florida Amateur Astronomers Association & The Fox Observatory

    or this Doc Clay's Kochab Clock, for finding Polaris and Kochab Weasner's Meade ETX Site

    Chip

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    I've been contemplating this technique for a few days now, and wondering how to solve the problem of estimating the offset from Polaris visually. Even using software to get a precise fix on NCP, I currently still need to apply the info without an actual reference tool. In other words, I see it on the computer, but need to translate the info manually while aligning. Clear as mud? Anyhoo...

    What I am thinking of trying is basically a larger replica of the etched reticle in a polarscope. Using a piece of plexiglass:
    1) Scribe the points for Polaris and Kochab. Translating degrees to inches, this would be about 16 and some change.
    2) Draw a line between them
    3) Determine the point at which NCP is. Again translating degrees to inches, about .75 inches away from Polaris.

    My math might be off here, but the idea is to hold it out in front of my face, focus by moving my hand away or towards me, and get the two stars to match the etching. Then, verify that the GLP is at the correct spot for NCP. Shampoo, rinse, repeat until satisfied.
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