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Thread: NGC5139 Omega Centauri

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    Default NGC5139 Omega Centauri



    I watched omega centauri tonight, one of the very few clear sky nights this winter in Santiago.

    I can not believe Herschel was able to watch omega centauri in 1677, my 6se shows it dim, diffuse but clearly. However Herschel back then?

    More info on NGC5139 here
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    Default Re: NGC5139 Omega Centauri

    Remember there was no light pollution or air pollution like we have today to kill our view of the universe. Go to a good dark site, hard to find, and see the difference.
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    Default Re: NGC5139 Omega Centauri

    Funny you mentioned this, last week i watched NGC5139 from Elqui Valley (This is where Tololo, La Silla and many observatories are) where a i was on vacations for a week and it was definitively a bit clearer but still a very hard task for a 1677 telescope.

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    Default Re: NGC5139 Omega Centauri

    It's a big object, possible to get a hint of it naked eye (in my place). A 10x50 binocular clearly shows the object, but the view struggle on slower optics.

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    Default Re: NGC5139 Omega Centauri

    This was one of the objects I was after while on a south pacific cruise. With help from the ship (turning off some lights) I was able to spot this with just my naked eye, binoculars showed a bright cluster. Now this was in the middle of the pacific ocean and the nearest land was almost 1000 nautical miles away. Those dark pollution free skies are the key.
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    Default Re: NGC5139 Omega Centauri

    The first time I ever saw it was from about 39° north, and it was just over the tree tops along the southern horizon and it wasn't clear at all being so low in the sky. I also had minimal light pollution as this was back in the early 1980s. Just in the past few years, I have observed it from Mexico a few times, around 19° N, in what I would judge as a zone 4 by the Bortle light pollution scale. It was an easy naked eye object and was stunning in my AR127 (f/6.5).

    As far as its history, it was actually listed in Ptolemy's catalog as a star, and Edmund Halley was the first to notice its non-stellar nature in 1677 when he described it as a "luminous spot or patch in Centaurus" (similar to what I saw it as from 39 N). However, it was John Herschel in the 1830s who first discerned its true nature as a globular cluster while observing from South Africa.
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    Default Re: NGC5139 Omega Centauri

    Last weekend we had clear enough weather that I was able to easily view it from 30 deg. North. I have a 12" goto Dob and using a 20mm 100 deg FOV EP it literally filled the eyepiece. I sat there in my back yard and viewed it for at least a half an hour. It is one of favorite objects to view in the sky. Unfortunately we can only see it for a couple of months out of the year at this latitude.

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    Last edited by Rcoggins; 05-12-2013 at 04:07 PM. Reason: spelling
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    Default Re: NGC5139 Omega Centauri

    We can see it here in Southern Arizona but it never gets higher than 10 degrees above the horizon. I think it is quite spectular as Globular Clusters go.
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    Default Re: NGC5139 Omega Centauri

    April 1 2012.jpgCan pick it out with my naked eye from my garden in Brisbane area - it's huge - but quite dim. With a few seconds exposure, it's huge and bright.
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    Default Re: NGC5139 Omega Centauri

    I can see it with the naked eye from parts of Auckland, New Zealand.
    It's something we often show people through the telescopes at the observatory I volunteer at.

    I can get pretty decent views of it through the celestron first scope from my back yard as well.
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