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Thread: Difficult M33?

  1. #11
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    Default Re: Difficult M33?



    Alec

    Definitely a binocular object. The smaller size in binoculars will concentrate the available light. You should find it easily in those skies of yours. Once you have done that, it will be easier to see in the scope.

    One tip is to try using a UHC or O111 filter. M33 has quite a large number of star forming regions, especially NGC604, and these can sometimes be enhanced using a filter.

    Looking forward to hearing of your success.
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  2. #12
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    Default Re: Difficult M33?

    Quote Originally Posted by hal2000 View Post

    One tip is to try using a UHC or O111 filter. M33 has quite a large number of star forming regions, especially NGC604, and these can sometimes be enhanced using a filter.
    Stevie,
    Yes, I wondered about an OIII. Might try to pinch one from our observatory this week.

    Alec.
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    Default Re: Difficult M33?

    Hello Alec,

    regarding the M33, my logbook tells: August through February, but the best views are as a rule in September and October. You'll need really dark skies to see this galaxy, the best way is to try it first with the binoculars.

    Regarding the filters, an UHC does the best job on the small apertures, enhancing the contrast of the spiral arms and of some of the star birth regions.

    Clear skies,

    JG
    Last edited by j.gardavsky; 08-05-2013 at 07:21 PM. Reason: added comment on filters
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    Default Re: Difficult M33?

    Quote Originally Posted by j.gardavsky View Post

    Regarding the filters, an UHC does the best job on the small apertures,

    JG
    Why would UHC be better than OIII JG?

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    Default Re: Difficult M33?

    Quote Originally Posted by Alec in France View Post
    Why would UHC be better than OIII JG?

    Alec.
    Hello Alec,

    I have been testing all filters in my arsenal when viewing the M33 through my 6incher.
    The best results has offered the Astronomik UHC, which transmits the OIII and H-Beta lines, and thanks to its more transmission in the blue below H-Beta, the filter also has better shown the spiral arms populated with the bluish OB stars associations.
    Another good filter has been the blue(RGB) CCD Baader, which transmits with 98% or better 400nm through about 510nm, including the OIII, H-Beta, H-Gamma, and the least important H-Delta. The blue(RGB) filter requires however very clear skies.

    The OIII filter extracts very well the NGC 604 star birth cloud, and through the larger apertures also some other star birth clouds, but the spiral arms become too dim. Some urban observers with larger Dobs prefer the OIII filter, but all what they can fix as a rule in the M33 is the NGC 604.

    See also: M33 HII Regions and Star Clouds

    Happy hunting,

    JG
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    Default Re: Difficult M33?

    Truth be told, easily seeing M33 is basically all just a matter of observing under skies that are honestly worth observing under!

    Way too many hobbyists today are attempting to persue astronomy under light polluted sky condition much worse than would have passed off as totally unusabe just 20 years ago. The fact is that, in a good sky, you can see M33 faintly with just the unaided eye and it proves to be obvious with any instrumentation whatever.

    BrooksObs

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    Default Re: Difficult M33?

    Quote Originally Posted by hal2000 View Post
    Alec

    Definitely a binocular object. The smaller size in binoculars will concentrate the available light. You should find it easily in those skies of yours. Once you have done that, it will be easier to see in the scope.

    One tip is to try using a UHC or O111 filter. M33 has quite a large number of star forming regions, especially NGC604, and these can sometimes be enhanced using a filter.

    Looking forward to hearing of your success.
    Really? I never thought of that before, both the binoculars and the filters. I live in Bortle 6/7 skies, do you think it's possible in 10x50s or a 130mm telescope?
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    Default Re: Difficult M33?

    Joe

    I actually meant to try a filter with a telescope, and a low power eyepiece, but, it might be worth trying the filter with binos as well. M33 is not a difficult object, especially in skies like yours, and especially in binos.

    I have not tried a filter with binos for M33, but I managed to see the California nebula in Perseus, a much more difficult object than M33 (even though it is huge) by using this technique. I held the filter between my forefinger and thumb, and just used the binos as normal.

    I have to say, all the tips given in this thread are all equally good and equally valid. Identify its position and a few surrounding stars using Stellarium, use averted vision and a slow scanning motion, and don't stare, relax your eyes and just gaze. The galaxy will eventually reveal itself to you.

    So give it a try guys, you'll all be delighted with the results.
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  12. #19
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    Default Re: Difficult M33?

    Stevie,
    You just renewed my interest in finding this galaxy.
    Thanks for all your help!
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    Default Re: Difficult M33?

    that was a difficult one a week ago - used 32mm, 24 and 18 - averted vision all the way - very very faint

 

 
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