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M33

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#1 norden

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Posted 18 September 2010 - 04:03 PM

This is a big, dim galaxy which filled most of the field. It showed a hint of spiral structure, especially the northern arm. This arm extended from the nucleus to the bright H II region, NGC 604. NGC604 is bright and easy, near the tip of the spiral arm. NGC 604 seemed like a small oval nebulas. Other bright knots and condensation were visible in this arm probably IC 142 and IC 143. The southern arm is also clear, but it is very difficult to identify individual H II regions. The galaxy core shows a bright nucleus. I notice at least two bright areas slightly off centre almost stellar in appearance. I assume these would be the emission nebulas NGC-595, NGC-592, and NGC-588.
Hope you like my sketch!

Mikael Anderlund

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#2 CarlosEH

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Posted 18 September 2010 - 04:21 PM

Mikael,

An excellent observation of M33. This large galaxy is not easy to observe as images of it are a misleading (at least making one think that it is brighter). You have captured the core and the faint arms very nicely. Thank you for sharing it with us all.

Carlos

#3 Sol Robbins

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Posted 18 September 2010 - 06:43 PM

Excellent!

#4 mathteacher

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Posted 18 September 2010 - 09:11 PM

I don't have much experience observing this galaxy, so thank you for revealing it to me!

#5 frank5817

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Posted 18 September 2010 - 09:35 PM

Beautiful capture.

Frank :)

#6 JimPie

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Posted 19 September 2010 - 12:27 AM

Very nice detail. Good capture of the bright knots and Hll regions.

#7 norden

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Posted 19 September 2010 - 01:15 AM

Thanks Carlos, SR, mathteacher, Frank and Jim!

Mikael

#8 Jef De Wit

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Posted 19 September 2010 - 07:33 AM

Very fine sketch. I admire how you put al those faint details on paper! How do you work?

#9 norden

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Posted 19 September 2010 - 10:17 AM

Hi Jef,

I often think that my scanned images are slightly too bright. This gives the impression that both M33 and NGC 206 are a clear and prominent. You and I know that these objects are very weak and diffuse, and most of the details are only visible with averted vision. Much of the work lies in the eyepiece and I look very long time and with several short break. Many short breaks are super important to me. My eyes will soon be tired when you concentrate. I also avoid any form of light, including red, when I study the object. Normally, I have no detailed map over the object because I usually know what I'm looking for. I have many times previously studied M33 both in the eyepiece and on image. This also applies to M31 and NGC 206. I also use my 20mm WO Binoviewers. Binoviewers are perfect when you sketch an object and allows you to see more details, although slightly lower light gathering ability. Two eyes see more than one.

Mikael

#10 FJA

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Posted 19 September 2010 - 10:22 AM

Sometimes you can't avoid a sketch which over-emphasises the brightness. This is because some objects are so faint that it is hard to capture that whether in making the sketch or in scanning/processing it. Also, there's no point in having a sketch so faint, you need averted vision to see it!
I think a sketch which shows an object brighter than it actually is, is fine especially if there's a note with it that says so.

Lovely sketch, one of the best I have seen of M33.

#11 norden

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Posted 19 September 2010 - 01:10 PM

Faith,thanks for the nice words. Yes, that is one of the big problem when sketching, how to sketch so faint that you need averted vision to see it! I often think that my scanned images are too bright. I don't know how to solve that problem.

Mikael

#12 FJA

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Posted 19 September 2010 - 01:21 PM

What editing software are you using? You should be able to alter the levels in order to make the image a tad darker.

#13 norden

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Posted 19 September 2010 - 02:22 PM

I'm using a simple and free software Roxio PhotoSuite and Paint which I can adjust brightness and contrast but when adjust the level too low I'm losing details which I can see when using averted vision.

#14 lunar

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Posted 19 September 2010 - 02:27 PM

Incredible sketch! I like the fact that you noted so much structure within the galaxy and detail!

#15 norden

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Posted 19 September 2010 - 02:30 PM

Thanks Brandon!

Mikael






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