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Thread: The NGC 6572 challenge

  1. #1
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    Default The NGC 6572 challenge



    check out this challenging intensely colored target. Is it blue or green? That may depend on your age. A star but maybe a planetary nebula? View before you look it up.
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    Default Re: The NGC 6572 challenge

    One of my favorites!

    Easy to find off "finder scope visible" Open cluster ngc 6633 and the nearby Graff's cluster.
    The challenge object is (to my eye) part of a fun asterism.
    Can you see the asterism?
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    Default Re: The NGC 6572 challenge

    Darn Ralph! I missed the asterism. Now I have to go back and look for that!

    I like this planetary too. It can be a bit tough to hunt down as it really fits in well with the star field around it.

    The last time I viewed it, I picked up a nice emerald green: "This planetary rather resembled the Turtle from last night, appearing as a small emerald dot, with maybe a hint of blue. Putting in the OIII filter, the few background stars all but disappeared, yet the nebula grew in diameter somewhat. Barlowing this configuration to 168x, the nebula was bigger, and during moments of steady air a brightening became evident on the lower portion of the nebula. With averted imagination I thought I might be seeing a central stellar object, but not sure. Filter off and no barlow, it was back to its tiny friendly green self."

    I think age may play a factor on the percieved color of planetaries, or even differences in eyes. My 14 year old nephew and I were observing NGC 6543, the Cat's Eye Nebula, several days ago. While I could see a nice blue globe in the eyepiece, to him it was very green.
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    Default Re: The NGC 6572 challenge

    Haven't seen it yet, will have to check it out.
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    Default Re: The NGC 6572 challenge

    I see it sort of as a blue-green, but admittedly, I have seen it vary over the years to my eyes. I will say that when it comes to planetaries, if they are going to show color other than a white or gray, I tend towards the blue end of the scale.

    Indeed age can be a factor, but even more of a factor is how our brain interprets the light being fed to it by the eyes. Many say they only see M42 as a grayish tone. I have always seen it as a pale green, from my younger days until now. That is in about 6 inches in aperture and larger, with smaller apertures and binoculars revealing the whitish-gray. I have shown it to people who are not astronomers, and whose interest is merely a passing fancy. When I ask them afterwards about color, everyone so far has agreed it was some shade of pale green. Then, I hear of others reporting pinks, especially in really larger apertures. While others have even mentioned some slight bluish tint.

    Some observers are adamant they see color in M57. I have never personally other than a whitish-gray, and I know some experienced astronomers will say it is a case of wishful seeing. That the light from M57 isn't sufficient to fire our color receptors. However, I am not so quick to dismiss the claims of others, simply because I cannot look through their eyes, only my own.

    The whole thing about color in DSOs is a very interesting side subject, and it seems to be a very personal experience. I know it can certainly initiate some spirited debate.
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    Default Re: The NGC 6572 challenge

    I always wonder about how much color can be seen in DSO's. I'd say that hands-down, the most color can be seen in planetaries. I also see M42 as greenish and always have, and that goes back to age 11. With regard to galaxies, I occasionally see some of them as almost silvery in color, whilst with others it's just a smudge of grey. M108 comes to mind as one that is silvery. I'm not sure if that is simply an effect of my eyesight, or if other factors are at work.
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    Default Re: The NGC 6572 challenge

    A lot of planetary nebulae like this one looks green to me.

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  8. #8
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    Default Re: The NGC 6572 challenge

    It is worth the challenge. Using the 0111 is the best way to view this tiny planetary once you locate it. I first located it - looked like a blue dot among the surrounding stars. Then I placed my 0111 in my diagonal and inserted EPs increasing in power. When the 0111 is in place the surrounding stars disappear as Bryan noted. Only the Neb is present and loses it round shape. By increasing the power you get a better view of it. Give it a try.
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