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M13, with a 4 inch refractor.

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#1 rodelaet



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Posted 14 June 2009 - 04:43 PM

M13 has always been one of my all time favourite deep-sky objects. This Globular is one of the summer highlights for Northern Hemisphere observers. It is bright and it is easy to find. When conditions allow, a four inch telescope is capable of resolving many stars within this spectacular globular. The low power view reminds me of little hairy spider. The cluster seems to show several branches attached to a mottled and fractured core. The core appears slightly yellow to me. With higher power and averted vision, these branches can be partially resolved into faint stars. Then with prolonged gazing, the cluster appears to show a few dark lanes as well. It is a hard task to do justice to this cluster with a sketch : the real view is so much more powerful. I tried to represent the typical low power view, with many faint stars at the verge of resolution.

Site : Bekkevoort, Belgium ( 51° N )
Date : May 29, 2009
Time : around 23.00 UT
Scope : Skywatcher 102/500mm achromatic refractor
Eyepiece : Baader Hyperion 5mm
Magnification : 100x
FOV: 41’
Filter : none
Seeing : 3/5
Transp. : 4/5
Sky brightness : 19.88 magnitudes per square arc second near zenith (SQM reading).
Nelm: 5.6
Sketch Orientation: N up, W right.
Digital sketch made with Corel Paint Shop Pro X2, based on a raw pencil sketch.

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#2 rd56



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Posted 14 June 2009 - 05:06 PM

Very nice Rony. You have captured this globular cluster beautifully. With my serious light pollution, M13 is one of the few globulars that are bright enough for me to begin to resolve.


#3 frank5817



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Posted 14 June 2009 - 06:26 PM


That is it! A perfect sketch of M-13 as it appears under good observing conditions. :bow: :rainbow: :bow:
How much darkness do you have this time of year?

Frank :)

#4 JayinUT


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Posted 14 June 2009 - 06:54 PM


A incredible capture of M13. The bright core is clearly evident and in my mind I can see the mass segregation that is occurring as the lighter stars are beginning spread out from the core. Your sketch led me to this article
Old Globular Clusters not so Old

It discusses that globulars though old in age, but in terms of their development are adolescences. Interesting study, I look forward to it being confirmed, and more importantly to viewing more of your sketching Rony.

#5 kraterkid


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Posted 15 June 2009 - 12:19 AM

Absolutely exquisite sketch of an all time favorite Rony! :bow: :rainbow: :bow: The core glow and arced arms (or spider's legs) are rendered with such delicate precision and accuracy. A GC at it's finest!

#6 Tom Machtemes

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Posted 15 June 2009 - 10:34 AM


:ooo:, nice sketch of M-13.



#7 Special Ed

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Posted 15 June 2009 - 12:17 PM


What a fine rendering of M13! :bow:

#8 rodelaet



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Posted 15 June 2009 - 03:26 PM

Thanks, everyone for the kind comments!

@ Frank : I try to make the best out of it. The SQM readings are around 19.6. Better times are coming in a few weeks. The family and I will be on vacation in Spain (Mallorca) where the night is dark @ 23hr at lat. 39°. :)

@ Jay : Nice article! It's a puzzling fact to me that galaxies have disk stars and globulars at the same time. Makes me wonder how galaxies are created in the first place. And imagine how our galaxy must look like when viewed from M13?!

#9 Tommy5



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Posted 15 June 2009 - 09:33 PM

Great sketch of a summer favorite, very realistic view.

#10 rodelaet



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Posted 21 June 2009 - 04:50 PM

Thank you, Tommy. :)

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