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Thread: "Resolving" Globs

  1. #11
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    Default Re: "Resolving" Globs



    Quote Originally Posted by stoest219 View Post
    Allen, I really like that system. That will really help me take notes when observing. I have to confess that when I first started I kinda had the "all globs look alike" mindset but as my skills have improved globs have become really interesting. I could not stop looking at M13 the other night, and I would have rated my view as a 3 on this scale.
    Good, glad that will help you out. Also happy that you have "evolved" in your appreciation of globulars. To the beginner and to those that don't look at them with a critical eye, they can indeed seem, in many cases, to come from a cookie cutter. However, there are differences there to be appreciated with closer scrutiny. While my primary observing targets are galaxies, my second favorite are globulars. If you haven't you might want to take a look at my past observing challenge series - Globular Gallop, which is in my blog (link below). Hopefully those articles will give you ideas for some globular targets. Happy globular hunting!

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    Default Re: "Resolving" Globs

    Magnification also helps as well. I can see a lot more at 135x than at 45x, which is the eyepiece I use for panning around and star-hopping. A lot of the medium size and smaller globulars tend not to show much resolution, just a few sparklers here and there. For example, the loose globular M56 in Lyra shows a bit of resolution, but not much. Something faint like NGC 5053 needs a very large aperture to resolve, I can't resolve it in my 10". I'm hoping my new scope will be a glob killer, will have to see how it pans out once the moon is gone.
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    Default Re: "Resolving" Globs

    Quote Originally Posted by KT4HX View Post
    If one wants to quantify globular resolution, you could use the five level ranking system employed by experienced and noted observer Don Pensack. Of course, resolution can be affected by aperture and magnification. Here is Don's system:

    5. Unresolved: looks like a nebula with no stars.
    4. Grainy: incipient resolution, with a few brighter stars occasionally winking in and out.
    3. Partially resolved: most of the outer stars are seen and averted vision shows some brighter members of the core winking in and out. Some core background still nebulous.
    2. Nominally resolved: stars seen across the cluster but stars are still a little soft and unresolved dead center.
    1. Fully resolved: pinpoint tiny stars seen all the way to the center, no nebulous haze of background stars. If you see this, chances are it's in a 12" or larger scope in superb seeing.
    Very handy system, I've managed to get a 3, maybe a 2 for M13 on a handful of very good nights with my 4.5" scope. It takes averted vision and a bit of patience, but it is doable. With my old C11 on a good night a 1 wasn't out of the question on a number of the bigger globs with appropriate magnification. Any sort of haze or glare from the moon can really kill the resolution of the cores, though, even with a big scope.
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    Default Re: "Resolving" Globs

    Crank up the magnification to bust those Globs. This and aperture are the important factors.
    Regards,
    Clay

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    Default Re: "Resolving" Globs

    I have been working on this same problem. I an in a high LP area but I have been finding lots of GCs and doing my best to resolve them. I will be getting to a dark sky site next weekend and will see the difference there but I can offer one trick for LP skies. Get a black cloth, towel, or t-shirt and throw it over your head and eyepiece. It will help drown out other light and let your eyes open up a bit more. Really try to relax your eyes. Keep your second eye open but cover it or use an eyepatch on it to keep your main eye more relaxed. Its like looking into one of those magic pictures from back in the 90s. Eventually you will start to see more and more detail I try to look through the cluster as well trying to see different layers. M13 is especially nice and probably one of the easier ones to practice on. The more relaxed you can make your eyes and the more outside light you can avoid the better it will look.
    bladekeeper likes this.

 

 
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