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Thread: M13- "Propeller"

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    Default Re: M13- "Propeller"



    Quote Originally Posted by KT4HX View Post
    Rick, based on your log excerpts I believe you are confusing the propeller indicated in the images I posted with the emanating arcs of stars that flow out from the core of M13. The actual propeller is a more difficult feature as it is smaller and very subtle visually. The fuzz you see as a backdrop for the streamers are simply more unresolved stars.
    Thanks for the clarification Alan. I'll keep an eye out for the propeller next time I'm on M13. Increased magnification will also be in order.
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  2. #22
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    Default Re: M13- "Propeller"

    Quote Originally Posted by rickg18704 View Post
    Thanks for the clarification Alan. I'll keep an eye out for the propeller next time I'm on M13. Increased magnification will also be in order.
    Rick, I think it was more about perspective of not knowing precisely how it would appear. When you were using 114x with the Z10 that should have been adequate under normal circumstances but do push up as needed. I have also attached yet another image I found that gives a wider and better positional perspective within the larger field. Everyone is familiar with the two 7th mag stars forming a triangle with M13 and laying south and east of the cluster. This image shows the position of the propellar (circled) relative to those stars, and even shows the bright nearby (in the field) galaxy NGC 6207 and dimmer galaxy IC 4617. North is up and west is right, the normal chart orientation.

    Look for those two stars as the propeller is on that side (southeast) of the core of M13, with the one blade pointing towards the imaginary line between the two stars. I added the annotations to the image to clarify my description.

    Hopefully more folks will be able to spot this curious feature.



    (image courtesy of Alexander Kupco)
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    Default Re: M13- "Propeller"

    Very cool - something to shoot for when I am actually able to get out this summer. Looks to be in the south-east "corner" of the cluster. Good to know. Hopefully I don't "phantom" it!

    Thanks all!
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